In a message dated 9/24/02 9:56:19 AM Eastern Daylight Time,
<< Scott, this is called a "residual pressure valve" and it's job is to
maintain a modest amount of pressure on the calipers to avoid the dreaded
piston kickback. Many folks, tired of servicing these things, remove the
internals and run direct without severe concequences. In fact, later model
cars (eg: TR6) do not even have them. >>
For most cars ( not TR specific) , the RPV is located inside the master
cylinder outlet. A rpv is a good idea for drum brakes as this keeps the
wheel cylinder seals flared outward. ( this prevents leaks) Most ( all?) cars
do not have a RPV for the disc brakes.
Racing brake companies have 2 PSI units for disc brakes and 5PSI ( possibly
10) units for drum brake systems.
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