Braking system for a vehicle

Abstract

A brake system 100 comprises an electric cylinder 51 with a servo motor 513, a rotary angle sensor SE2, and a control unit 81. The rotary angle sensor SE2 is configured to detect a Z-pulse, which is generated each time the servo motor 513 completes a rotation, and a phase pulse, which is generated each time the servo motor 513 rotates by a predetermined angle. The control unit 81 performs rotary angle sensor test processing. During the rotary angle sensor test processing, the control unit 81 rotates the servo motor 513 so that a piston 512 moves backward. The control unit 81 counts the number of phase pulses in a period from the detection of a first Z-pulse to the detection of a second Z-pulse. The control unit 81 determines that the rotary angle sensor SE2 is functioning normally if the number of phase pulses is within a predetermined range.