Brake Proportioning/Residual Pressure Valves
A brake proportioning valve, lets a certain percentage of pressure through, to the rear wheels, which reduces the pressure applied, to the rear brakes. It does not matter what type of brakes the vehicle has as the rear brakes require less force than the front brakes. The reason for this is that if the front and rear were to be sent the same amount of pressure the rear wheels would lock up before the front would. This is caused because as you step on the brakes weight is transferred to the front of the vehicle, this is why the front end dips down when braking.
Residual Pressure Valves
Residual pressure valves are a pressure valve used to keep pressure in the brake lines. Most commonly used on a vehicle when the brake pedal and master cylinder is mounted on the floor. When the master cylinder is mounted on the floor it will be below the calipers. When this is done gravity will pull the fluid to the lowest point which will cause the fluid o flow away from the calipers. A residual pressure valve will aid in retaining the pressure in the brake lines.
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