2LikesThread: Residual Pressure Valve
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11-05-2014 07:08 PM #10
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There is a second reason for having residual valves on drum brakes. The small amount of residual pressure keeps the cups in the wheel cylinders expanded. This prevents air from being drawn into the system. Some later drums have expanders on the internal wheel cylinder springs that eliminate this problem.
Here are some links:
Typical Brake System Configurations
Camaro Brake Valves
Classic Chevy, Chevrolet, GMC, Ford technical articles
Hot Rodder's Bible : The Ultimate Guide to Building Your Dream Machine - Steve Hendrickson Gerry Burger - Google Books
Brake Systems: OEM & Racing Brake Technology - Mike Mavrigian, Larry W. Carley - Google Books
Designing Your Brake System
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