These in-line pressure valves retain a minimum brake line pressure to help eliminate excessive pedal travel in both disc and drum brake systems. The two pound valve is used in disc brake applications where the master cylinder is mounted below the horizontal plane of the calipers and fluid drain back occurs from gravity and vibration, thereby causing excessive caliper piston retraction and a longer brake pedal stroke. The minimal two pound residual pressure prevents fluid from flowing back without causing the brakes to drag. With drum brakes, a ten pound valve is used to compensate for return spring tension in the drums. Residual Pressure Valves are made from billet aluminum and color coded for easy identification. Ideal for drag racing, street rod and many off road applicationsPit Stop USAoffers Wilwood Residual Pressure Valve - 2 Lb (Blue) 260-1874 at low everyday prices. Be sure to check out all of our products from Wilwood Engineering including Wilwood Engineering Residual Pressure Valves and Wilwood Engineering Residual Valves.