Electromechanical braking system and method for releasing an electromechanical braking system

Abstract

The present invention relates to an electromechanical braking system, which includes a brake actuator (2) having a power transmission device for transmitting a driving force to a brake pad (10b), the power transmission device including a rotatable shaft (81); a coupling device having a locking element (35), wherein the coupling device can be controlled to engage the locking element with the rotatable shaft and prevent its rotation, or to disengage the locking element from the rotatable shaft so that the rotatable shaft can rotate; and a first receiver into which a first tool element (31) can be inserted to engage it with the rotatable shaft and transmit rotation to the rotatable shaft. The present invention also relates to a method for releasing an electromechanical brake.

Description

Technical Field

[0001] The present invention relates to an electro-mechanical brake system, a mechanical brake release tool, and a corresponding method. Background Art

[0002] Today, electro-pneumatic brake actuators are often used in commercial vehicles. In most cases, these actuators use pneumatic energy through cylinders to drive the service and parking brakes. The function of the parking brake is achieved by an actuator independent of the service brake and can be operated independently. Due to the spring design of the parking brake actuator, actuation of a single brake can also be achieved without compressed air as the energy source. In the event of a system pressure loss, the pre-tensioned spring in the parking brake chamber provides sufficient braking energy to stop or keep the vehicle stationary. When there is no compressed air supply on the vehicle, in order to allow the vehicle to be towed, the parking brake cylinder must be released. In a combined pneumatic brake chamber, this release can be achieved through a threaded mechanism. The threaded shaft is led out of the brake chamber and can be accessed by the operator. By turning this shaft with an ordinary tool, the brake can be released.

[0003] In the future, the drive of electro-mechanical brakes will become increasingly common. These brakes must also be able to be released from the outside. In the event of a failure, if the brake remains in the actuated state and cannot be released during normal operation, there is a need to have the possibility to release the brake so that the vehicle can be towed. Due to the complexity of electro-mechanical actuators, it is necessary to provide a new solution for emergency brake release. Summary of the Invention

[0004] The object of the present application is to provide an electro-mechanical brake system, a mechanical brake release tool, and a corresponding method that allow for the emergency release of electro-mechanical brakes.

[0005] This object is achieved by a brake system including the features of the technical solution of the present invention, a kit including the features of the technical solution of the present invention, and a method including the features of the technical solution of the present invention.

[0006] According to one aspect, the brake system includes: a brake actuator having a power transmission device for transmitting an actuating force to a brake pad, the power transmission device including a rotatable shaft; a coupling device having a locking element, wherein the coupling device can be controlled to engage the locking element with the rotatable shaft and prevent its rotation, or to disengage the locking element from the rotatable shaft so that the rotatable shaft can rotate; and a first receiver into which a first tool element can be inserted to engage with the rotatable shaft and transmit rotation to the rotatable shaft, thereby actuating or moving the brake pad. The receiver is configured to allow the first tool element to be freely inserted into and removed from it.

[0007] Once a first tool element, a tool which can be, for example, a wrench, is inserted into the brake actuator of the braking system so as to engage with the rotatable shaft, it can be used to manually move the brake actuator to release or clamp the brake. In this way, the braking system can be released and activated from the outside even when the vehicle is not running.

[0008] According to one embodiment, the braking system further includes a second receiver into which a second tool element can be inserted so as to engage with the locking element and disengage the locking element from the rotatable shaft, so that the rotatable shaft can be moved and the brake pads can be moved or actuated.

[0009] According to one embodiment, the second tool element is configured to engage with the locking element and disengage the locking element from the rotating element.

[0010] Before releasing the brake with the first tool element, it is a prerequisite to release the locking element, because when the brake actuator and the rotatable shaft are locked by the locking element, they cannot be rotated. The locking element can be manually released with the second tool element and allowed to be lifted or displaced, and in some cases can resist the pre-tightening force of the mechanism that firmly fixes the locking element on the rotatable shaft in the parking brake or locked state. In the braking system, the locking element is pressed against the rotatable shaft by a spring mechanism or other tools, such as a permanent magnet, in the parking brake state. In addition, a spring mechanism can be provided to push or pull the locking element in the opposite direction and assist the second tool element in releasing the locking element.

[0011] According to an alternative embodiment, the braking system further includes a second receiver into which a second tool element can be inserted so as to engage with the locking element and engage the locking element with the rotatable shaft, so that the rotatable shaft is locked and the brake pads cannot be moved or actuated.

[0012] According to another embodiment, the rotatable shaft includes a disc-shaped rotating member having gears. The rotating member can be provided at one of the ends of the rotatable shaft.

[0013] According to one embodiment, the coupling device includes a spring mechanism for moving the locking element to a position where it engages with one of the sides of the rotating member. The spring mechanism can include one or more springs. In an alternative braking system, the coupling device includes other devices, such as a permanent magnet, for holding the locking element in a position where it engages with one of the sides of the rotating member. In addition, a spring mechanism can be provided to push or pull the locking element in the opposite direction and assist the second tool element in releasing the locking element.

[0014] According to one embodiment, the coupling device includes a bistable clutch, which includes a spring, a permanent magnet, and an electromagnetic coil. The spring holds the locking element in a first position, such as a position where the locking element engages with the rotating member. The permanent magnet holds the locking element in a second position, such as a position where the locking element disengages from the rotating member. The electromagnetic coil can switch between these two positions during electrical operation. However, according to another embodiment, the first and second positions can be interchanged with respect to the engagement or disengagement between the locking element and the rotating member, respectively.

[0015] According to another embodiment, the first tool element further includes a threaded shaft, the threads of which have a pitch that can engage with the gear of the rotating member of the shaft. Then, the rotatable shaft interacts with the first tool element in the manner of a worm gear.

[0016] According to one embodiment, the locking element has a disc shape and is arranged on the coupling device such that it can move towards the rotating member, and one of its sides is formed to engage with one of the sides of the rotating member to prevent its rotation. The locking element can also be moved so that one of its sides disengages from the said one of the sides of the rotating member, allowing it to rotate.

[0017] The locking element and the rotating member of the rotatable shaft can be arranged for releasable coupling, where the locking is achieved by the engagement between two opposing surfaces of the locking element and the rotating member by means of a mechanism that presses the locking element towards the rotating member to achieve the parking brake state. The mechanism can be a spring mechanism with one or more springs, or some other tool, such as a permanent magnet. The mechanism can also have another arrangement, where one of the locking element or the rotating member is pulled towards the corresponding other one to achieve the parking brake state. The braking system can include means, such as an electromagnetic actuator, for moving the locking element relative to the rotating member during normal operation.

[0018] According to one embodiment, the tool that serves as the second tool element and allows the locking element to be lifted or moved can have one or more wedge-shaped portions at one or more of its ends, which can be inserted between the locking element and the rotating member and achieve the separation of the locking element and the rotating member when the second tool element is pushed forward. The second tool element can have the shape of a fork.

[0019] According to one embodiment, the locking element has a disc shape and has protrusions or wings extending radially from the disc-shaped body on its opposite sides, and the two wedge-shaped portions of the second tool element can engage therein to move the locking element.

[0020] According to one embodiment, the locking element, the rotatable shaft, and the rotating member are coaxially arranged with respect to their axis of symmetry.

[0021] According to one embodiment, the power transmission device is electrically driven and causes a rotational movement of a rotatable shaft. An electric motor can be used as an actuator.

[0022] According to one embodiment, a coupling device and a locking device are arranged in an electromagnetic parking brake locking mechanism for locking a brake actuator.

[0023] According to another aspect, an emergency brake kit is provided, which includes the brake system as described above and one or both of the first and second tool elements. If the vehicle stops operating and one or more of its brakes need to be released or clamped, the emergency brake kit can be used.

[0024] According to the present invention, a method for releasing an electromechanical brake is also provided. The method includes the following steps: inserting a first tool element into the brake actuator of the electromechanical brake, engaging the first tool element with the rotatable shaft of the brake actuator; inserting a second tool element into the brake actuator, engaging the second tool element with the locking element of the brake actuator. The locking element locks the movement of the brake actuator and the rotatable shaft in a state of locked braking. By inserting and actuating the second tool element to move the locking element, the locking element is disengaged from the rotatable shaft of the brake actuator, and the first tool element is moved to transmit torque to the rotatable shaft of the brake actuator, causing the rotatable shaft to rotate to release the brake.

[0025] Alternatively or additionally, the method may include the following steps: inserting a first tool element into the brake actuator of the electromechanical brake, engaging the first tool element with the rotatable shaft of the brake actuator, moving the first tool element to transmit torque to the rotatable shaft of the brake actuator, causing the rotatable shaft to rotate, thereby locking the brake; inserting a second tool element into the brake actuator, engaging the second tool element with the locking element of the brake actuator, and by inserting and actuating the second tool element to move the locking element, making it engage with the rotatable shaft of the brake actuator, so that the locking element locks the movement of the brake actuator and the rotatable shaft in a state of locked braking.

[0026] According to one embodiment, the method includes the step of rotating the first tool element to release the torque applied to the locking element by the rotatable shaft in the state of locked braking before disengaging the locking element from the rotatable shaft.

[0027] According to another embodiment, the method includes the following steps: selecting one of at least two possible directions of the second tool element for inserting the second tool element into the brake actuator to engage it with the locking element and disengage the locking element from the rotatable shaft of the brake actuator, and advancing the second tool element so that the wedge-shaped end of the second tool element moves the locking element according to the selected direction, thereby disengaging it from the rotatable shaft of the brake actuator.

[0028] According to another embodiment, the method comprises the steps of inserting a second tool element into one of at least two possible receivers of a brake actuator to engage a locking element and disengage the locking element from a rotatable shaft of the brake actuator, and advancing the second tool element so as to move the locking element and disengage it from the rotatable shaft of the brake actuator according to the selected receiver.

[0029] Each receiver may be formed by two openings for receiving two ends of the second tool element. Inserting the second tool element into another receiver may move the locking element to a position where the locking element engages the rotatable shaft of the brake actuator.

[0030] According to another embodiment, the method comprises the steps of selecting one of at least two possible orientations of the second tool element for inserting the second tool element into the brake actuator to engage the locking element and moving the locking element so that it engages the rotatable shaft of the brake actuator, and advancing the second tool element so that a wedge-shaped end of the second tool element moves the locking element to engage the rotatable shaft of the brake actuator according to the selected orientation.

[0031] According to another embodiment, the method comprises the steps of inserting a second tool element into one of at least two possible receivers of a brake actuator to engage a locking element and move the locking element so that it engages the rotatable shaft of the brake actuator, and advancing the second tool element so as to move the locking element and engage it with the rotatable shaft of the brake actuator according to the selected receiver.

[0032] The method may further comprise the action of moving the locking element into engagement with the rotatable shaft. This action may be carried out as part of a parking rest operation before using one of the first or second tool elements to disengage the locking element from the rotatable shaft, but may also be carried out after these actions, for example when the vehicle is towed away and parking is required. The engagement of the locking element with the rotatable shaft may be accomplished by a magnet, in particular a permanent magnet of a coupling device, or by a spring mechanism that engages the locking element with the rotatable shaft.

[0033] The method may comprise other steps, and the features of the brake system and the first and second tool elements may be as described above. The method may be used for an electromechanical brake with an electromagnetic parking brake lock, where an electromagnetic lock such as a coupler is first released and then a first tool element is used to gently release the brake pre-tension. The external operation of the brake may be carried out with a combination of one or more of the above release steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Other features, characteristics and advantages of the present invention will be described in the following embodiments with reference to the accompanying drawings, in which:

[0035] Figure 1 shows a schematic view of an electromechanical braking system according to an embodiment; and

[0036] Figure 2 shows an electromechanical braking system according to an embodiment;

[0037] Figure 3a a, b show two embodiments of a first tool element;

[0038] Figure 4a a, b show cross-sectional views of a brake actuator and a first tool element during insertion ( Figure 4a ) and after engagement with a rotating member of the rotatable shaft of the brake actuator ( Figure 4b );

[0039] Figure 5 shows an embodiment of a second tool element;

[0040] Figure 6 shows an electromechanical braking system applying the first and second tool elements according to an embodiment;

[0041] Figure 7a , 7b shows a cross-sectional view of a brake actuator in a plane perpendicular to the axis of rotation of the rotatable shaft of the brake actuator, with the first tool element inserted and the second tool element before insertion ( Figure 7a ) and a cross-sectional view in a plane parallel to the axis of rotation of the rotatable shaft ( Figure 7b );

[0042] Figure 8a , 8b shows a cross-sectional view of a brake actuator in a plane perpendicular to the axis of rotation of the rotatable shaft of the brake actuator, with the first and second tool elements in the inserted and engaged positions ( Figure 8a ) and a cross-sectional view in a plane parallel to the axis of rotation of the rotatable shaft ( Figure 8b ); and

[0043] Figure 9 shows details of a second tool element engaged with a locking element according to an alternative embodiment.

[0044] Embodiments of a braking operation device according to the present invention are described below with reference to the accompanying drawings. Detailed Description

[0045] In Figure 1In [the figure], an electromechanical braking system is shown, which includes a brake caliper 1 and a brake actuator 2. The brake actuator 2 is connected to the brake caliper 1 and includes a force transmission mechanism. The force transmission mechanism includes a shaft assembly 8 and a rod assembly connected to the shaft assembly 8 through a push-type or push-pull joint 9. The rod assembly transmits the actuating force from a motor 4, such as an electric motor, to one or more brake pads 10b through a thrust mechanism 10 connected to the rod 7 of the rod assembly. The brake actuator 2 is configured such that the actuating force generated by the motor 4 connected to the rotatable shaft 81 is transmitted as a translational force to the rod 7 through the translational element 82 of the shaft assembly 8 via a rotary-translational conversion mechanism. The rod 7 transmits this force to one or more brake pads 10b by rotating around a fixed point at the end of the rod 7. The brake actuator 2 further includes an electromagnetic coupling or clutch assembly 3.

[0046] The coupling assembly 3 has a rotating member 36 connected to the rotatable shaft 81 of the shaft assembly 8. The coupling assembly 3 further includes a coupling body 34 with an electromagnetic actuator inside and a locking element 35 movable by the electromagnetic actuator.

[0047] In the locked position, the coupling body 34 forces the locking element 35 to contact the rotating member 36 of the rotatable shaft 81. In the contact position, the rotating member 36 and the locking element 35 and the rotating member 36 and the coupling body 34 are anti-twist. In this way, if the locking element 35 is activated after the brake actuator 2 applies a clamping force to one or more brake pads 10b, the coupler 3 can fix the rotatable shaft 81 in a position and provide a constant braking force.

[0048] In an emergency, when the braking system has no power, it may be necessary to deactivate or activate the parking brake. Then the following mechanical tools and methods can be used to release or lock the brake. In the parking brake state, the brake and the actuator are pre-tightened so that the brake is locked and the coupler 3 is in the locked position.

[0049] In Figure 2 the illustrated embodiment, the housing has a cover 21 covering an opening for inserting a first tool element 31 into the brake actuator and the coupling assembly 3, and two covers 22 covering two openings for inserting a second tool element 32 to release the brake. Embodiments of the first tool element are shown in Figure 3a , b. Embodiments of the second tool element 32 are shown in Figure 5 and it can be a coupling switching tool in the shape of a fork.

[0050] After removing the covers 21, 22, the first tool element 31 can be inserted into the opening in the housing for the cover 21 until it reaches the hole-shaped receiver and contacts the rotary member 36 of the coupling assembly 3. The rotary member 36 is formed as a worm gear. The first tool element 31, which is designed as a worm at its distal end, engages with the rotary member 36 of the coupling assembly 3 and can be screwed into the receiver until it reaches the end of the blind hole in the housing. In this position, the first tool element 31 blocks the rotary member 36. In Figure 4b the illustrated embodiment, the rotary member 36 can be blocked against counterclockwise rotation. At this time, the coupling assembly 3 remains locked. Since the coupling assembly 3 is prestressed in the parking brake state, the user should apply a certain torque to the first tool element 31 to reduce the stress on the coupling 3. This will also help to protect the coupling 3.

[0051] Now, the second tool element 32 can be inserted into the hole in the housing for the cover 22, as Figure 6 shown. Since the second tool element 32 includes a distal end portion with an asymmetrical wedge, there can be two directions with different functions when inserting the second tool element 32, one for deactivating the coupling 3 and the other for activating the coupling 3, depending on the direction of the wedge portion of the end of the second tool element 32 relative to the locking element 35. Marks, notes or protrusions on the tool and / or the housing can help to select the correct direction for the desired action.

[0052] When inserting the second tool element 32, the wedge portion at the distal end of the second tool element 32 engages with the locking element 35 and causes it to move under the action of a tool such as a spring that pre-tensions the locking element 35, so that the coupling 3 is disconnected. Figure 7a b and Figure 8a and 8b show this disconnection process, which respectively show the situation before and after the wedge portion at the end of the second tool element 32 engages with the locking element 35 on its opposite sides. In Figure 7a and 8a it can be seen that protrusions or wings protrude from opposite sides of the disc-shaped locking element 35, which facilitates the engagement of the locking element 35 with the second tool element 32. These protrusions help to disconnect the coupling 3 without tilting. Additional contact points can be provided between the second tool element 32 and the locking element 35 to improve the operation.

[0053] The visible end stop (or mark) at the second tool element 32 indicates whether the second tool element 32 is inserted deep enough into the housing to unlock the coupling 3. In Figure 7a and 8aOn the two rods of the second tool element 32, corresponding protrusions can be seen. Now, with the disconnection of the coupler 3, the prestress of the brake is led from the rotating member 36 through its worm gear and worm to the first tool element 31 located in the housing receiver. By rotating the first tool element 31, the rotating member 36 will also rotate. The pitch driven by the worm gear and the diameter of the front end of the worm screw determine the strength of the release. Once the brake is released, the first tool element 31 and the second tool element 32 can be removed. The holes can be closed with covers 21, 22.

[0054] The first tool element 31 can be designed as Figure 3a the crank shown, or as Figure 3b a common connecting piece for an electric drive or a pneumatic hand tool as shown.

[0055] Through the said first and second tool elements 31, 32, the parking brake can also be activated without operating the vehicle. To do this, first remove the covers 21, 22. The first tool part 31 must be inserted and rotated forward (clockwise in Figure 4b ) to rotate the rotating member 36 and pre-tension the brake. The number of rotations and the rotational torque applied to the first tool element 31 determine the clamping force of the brake. Then, the second tool element 32 is inserted into the housing 2 until the end stops, and the correct orientation of the second tool element 32 needs to be considered to close the coupler 3. For the activation of the parking brake, the wedge-shaped part at the end of the second tool element 32 moves the locking element 35 in the direction of the rotating member 36 and locks it in the prestressed position of the brake. Then, the first tool element 31 and the second tool element 32 can be removed. Subsequently, the brake actuator housing can be closed with the covers 21, 22.

[0056] Modifications can be made to the illustrated embodiments without departing from the scope of the present invention. According to Figure 7a , 8a the illustrated embodiment, the wings of the locking element 35 are almost in the same plane as the teeth of the rotating member 36. Due to this arrangement, there are only limited possibilities for the first tool element 31 and the second tool element 32 not to cross or block each other in the direction around the axis of the actuator. Axially offsetting the wings of the locking element 35 or the rotating member can enable the second tool element 32 to better engage the wings around the axis of the actuator.

[0057] Changing the orientation of the second tool element 32 with a wedge-shaped distal end when inserting it into the housing of the brake actuator 2 to lock or unlock the locking element 35 from the rotary member 36 is just one embodiment of the means for moving the engagement of the locking element 35. Alternatively, wedge-shaped portions provided on the locking element 35 for each direction of movement are also conceivable. In this case, parallel holes and receivers can be provided in the housing of the brake actuator 2 for the second tool element 32, which lead to the respective inclined surfaces or wedge-shaped portions of the locking element 35. To disconnect or close the coupler 3, the tool must be inserted into the correct hole to contact the correct inclined surface or wedge-shaped portion of the locking element 35, thereby achieving locking or unlocking. It is also conceivable that the holes or receivers extend into the brake actuator 2 and its housing from different directions in order to push or pull the locking element 35 in the desired direction.

[0058] As an alternative, inclined surfaces can be provided in the brake cylinder housing to bend or deflect the end of the second tool element 32 in order to move the locking element 35 during insertion. This is illustrated in Figure 9 which shows that when the end of the second tool element 32 is inserted into the receiver of the brake actuator 2 on one of the sides, a part of the locking element 35 is displaced in the direction of the horizontal arrow.

[0059] The end stops of the second tool element 32 can also be installed in different positions. The advantage of providing the end stops outside the brake cylinder housing is good visibility. The end stops can also be provided at the ends of the blind holes in the housing of the brake cylinder 2, or offset on the profile of the second tool element 32, and the end stops are provided on both wings of the locking element 35.

[0060] List of reference numerals

[0061] 1 Brake caliper

[0062] 2 Brake actuator

[0063] 3 Electromagnetic coupler assembly

[0064] 4 Electric motor

[0065] 7 Rod assembly

[0066] 8 Shaft assembly

[0067] 9 Joint

[0068] 10b Brake pad

[0069] 10 Thrust mechanism

[0070] 31 Tool

[0071] 32 Tool

[0072] 34 Coupling body

[0073] 35 Coupling device moving element

[0074] 36 Rotating member

[0075] 81 Rotatable shaft

[0076] 82 Translating element

Claims

1. An electromechanical braking system, comprising: A brake actuator having a power transmission device for transmitting a actuating force to a brake pad, the power transmission device including a rotatable shaft; A coupling device having a locking element (35), wherein the coupling device can be controlled to engage the locking element (35) with the rotatable shaft (81) and prevent its rotation, or to disengage the locking element (35) from the rotatable shaft (81), so that the rotatable shaft (81) can rotate; and A first receiver into which a first tool element can be inserted to engage the first tool element with the rotatable shaft (81) and transmit rotation to the rotatable shaft (81), wherein the braking system further includes a second receiver into which a second tool element (32) can be inserted to engage with the locking element (35) and disengage the locking element (35) from the rotatable shaft (81).

2. The braking system according to claim 1, wherein, The second tool element (32) is configured to be attachable to the locking element (35), and the locking element (35) can be disengaged from a rotating element.

3. The braking system according to claim 1 or 2, wherein, The rotatable shaft (81) includes a disk-shaped rotating member (36) in the form of including gears.

4. The braking system according to claim 3, wherein, The coupling device includes a spring for moving the locking element (35) to a position where it engages one of the sides of the rotating member (36).

5. The braking system according to claim 3, wherein, The first tool element (31) further includes a threaded shaft, and the thread of the threaded shaft has a pitch that can engage with the gear.

6. The braking system according to claim 3, wherein, The locking element (35) has the shape of a disk and is arranged on the coupling device so that the locking element can be moved to engage one of its sides with one of the sides of the rotating member (36) to prevent the rotating member from rotating, and can be disengaged from one of the sides of the rotating member (36) to allow it to rotate.

7. The braking system according to any one of claims 1 to 2 and 4 to 6, wherein, The locking element (35) has a disk shape and has protrusions radially extending from the disk-shaped locking element (35) on its opposite sides.

8. The braking system according to any one of claims 1 to 2 and 4 to 6, wherein, The power transmission device is electrically driven and causes a rotational movement of the rotatable shaft (81).

9. The braking system according to any one of claims 1 to 2 and 4 to 6, wherein, The coupling device is arranged in an electromagnetic parking brake locking mechanism for locking the brake actuator.

10. An emergency braking kit, comprising the braking system of claim 1 and one or both of the first tool element and the second tool element (32).

11. A method of releasing an electromechanical brake, comprising: Inserting a first tool element (31) into a brake actuator of an electromechanical brake to engage the first tool element (31) with the rotatable shaft (81) of the brake actuator; Inserting a second tool element (32) into the brake actuator to engage the second tool element (32) with a locking element (35) of the brake actuator, the locking element (35) locking the movement of the brake actuator; By inserting the second tool element (32), disengaging the locking element (35) from the rotatable shaft (81) of the brake actuator; And Move the first tool element (31) to transfer power to the rotating element of the brake actuator, causing the rotatable shaft (81) to rotate to release the brake.

12. The method according to claim 11, wherein, The method further includes rotating the first tool element (31) to release the torque applied by the rotatable shaft (81) to the locking element (35) in the locked brake state before disengaging the locking element (35) from the rotatable shaft (81).

13. The method according to claim 11 or 12, wherein, The method further includes selecting one of at least two possible directions of the second tool element (32) to insert the second tool element (32) into the brake actuator (2) to engage the locking element (35) and disengage the locking element (35) from the rotatable shaft (81) of the brake actuator (2), and advancing the second tool element (32) such that the wedge-shaped end portion of the second tool element (32) moves the locking element (35) in the selected direction, thereby disengaging the locking element from the rotatable shaft (81) of the brake actuator (2).

14. The method according to claim 11 or 12, wherein, The method further includes inserting the second tool element (32) into at least one of at least two possible receivers of the brake actuator (2) to engage the locking element (35) and disengage the locking element (35) from the rotatable shaft (81) of the brake actuator (2), and advancing the second tool element (32) such that the locking element (35) is moved and disengaged from the rotatable shaft (81) of the brake actuator (2) according to the selected receiver.

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