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Originally Posted by edwhite7
If I understand it correctly the residual pressure valve is designed to hold about 2 bs in the line on cars that have the master cylinder below the wheel cylinders. If this is not the case then they can be removed but even so they should not be a problem unless thery have failed. I had residual pressure valves in my car and I removed them. I did not notice any change but my master cylinder is above the wheel cylinders. It sounds like the pedal free play is not the issue, I suspect the master cylinder but only cause it can't be much else.
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The RPV's built into the early ERA master cylinders maintained about 10 psi because the master was originally intended for a drum brake system.
Which is why it must be disabled.