DISC BRAKE WITH SPRING BRAKE AND PRESSURE-COMPENSATING SELF-ADJUSTER

摘要

A disc brake actuator is disclosed which includes a piston for urging the brakeshoes toward a rotor and an automatic adjuster to properly position the piston in the actuator housing. The adjuster is actuated by relative movement between it and the piston and is mounted on a member that reciprocates with the piston during high-pressure brake applications thus precluding adjustment, but is held stationary during low-pressure applications to permit operation of the adjuster. Such a compensated adjuster is particularly useful when mechanical actuation is provided in addition to the usual hydraulic actuator.