The invention relates to a brake of industry vehicles. The brake mainly comprises a pedal arm, a support, a return spring, a lock pawl, an elastic finger, a control level, a control screw, a lock nut, zip-fastener hanging parts, a hanging scroll, an adjusting bolt, a zip-fastener balancer and an elastic body. One side of the pedal arm facing to the support is fixedly connected with a wiredrawing scroll, the latch hook of the pedal arm, the thrust face of the level, the return piece of the finger. One side of the support facing the pedal arm is fixedly connected with the pivot shaft of the pedal arm, the pivot shaft of the lock bolt pawl, and the pivot of the control level. The side is also equipped with the stop slot of the pedal arm, the stop slot of the finger and the stop slot of the lock bolt pawl. The invention has the advantages of simple structure, easy fabrication, reliable operation, being completely controlled by the pedal, the only locking position and the subsequent stable brake force due to locking at the first operating position and unlocking at the second operating position, moreover having the function of the adjustable unlocking travel and the compensation of the abrasion of the brake block.