Technician A says metering valves function only during the initial stages of braking. Technician B says the proportioning valve restricts fluid to the rear wheels, thereby lowering the pressure to help prevent wheel lockup in the rear. Who is correct?

Question

Technician A says metering valves function only during the initial stages of braking. Technician B says the proportioning valve restricts fluid to the rear wheels, thereby lowering the pressure to help prevent wheel  lockup in the rear. Who is correct?

Quizplus · Accepted Answer

Technician A is correct as metering valves are designed to hold back brake pressure to the front brakes until the rear brakes start to engage and both front and rear brakes can work together to stop the vehicle. 
Technician B is correct as the proportioning valve restricts fluid to the rear brakes, which helps to prevent wheel lockup by keeping the pressure lower in the rear brakes than in the front brakes.

Technician a Says Metering Valves Function Only During the Initial