Quote:
Originally Posted by bobsmanstuff
What do you mean by residual.
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Residual valves are required in older/vintage drum brakes to prevent air from entering past the wheel cylinder cups during fast release. Your stock '53 has one located at the end of the bore inside the master cylinder. These are sometimes called a check valve.
Drum dual masters had them located behind the tube seats up until the early '70s. Aftermarket inline 10 lb drum valves are available if there are no internal valves in the dual master you choose.