Technician A says the metering valve keeps the front disc brakes from operating until the rear drum brakes have started to work. Technician B says the proportioning valve reduces the hydraulic pressure at the rear drum brakes when high pressure is required at the front disc brakes. Who is correct?

Question

Quizplus · Accepted Answer

Both technicians are correct. The metering valve ensures that the front disc brakes do not engage until the rear drum brakes have begun to work, while the proportioning valve regulates the pressure to the rear drum brakes during hard braking to prevent lockup and maintain control.

Technician a Says the Metering Valve Keeps the Front Disc