This is the brake actuator its called also brake vacuum which is helping to applying the brake this actuator is working two functions in same divice one is parking brake and another is service brake. In side the actuator having two return spring a diaphragm and seals push rod, yoke brake chamber. A brake actuator is basically a relay device in a rear brake assembly. It throws out high pressure air into the rear brake assembly as soon as the driver touches the brake pedal and it's sound is characterised by a loud albeit short hiss when the brakes are applied.
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Brake actuator diaphragm replacement of vehical
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