2PSI Brake Residual Valve

These valves are used to hold a certain amount of pressure in the lines even when the pedal is not pressed. This is a sort of preloaded line pressure to activate the brakes more quickly. They will give a higher, harder and more responsive pedal. Residual check valves should not be used as a substitute for a properly functioning system. For instance, do not use residual check valves in place of complete and proper bleeding procedures.

Check valves will most likely be necessary when the master cylinder is lower than the calipers or hard lines run higher than the master cylinder fluid level. In disc brakes a 2 lb. valve prevents fluid from flowing back without causing the brakes to drag. With drum brakes, a 10 lb. valve is used to compensate for return spring tension in the drums.

Residual check valves are generally color coded blue for 2 lb. and red for 10 lb. for easy identification.