Re: master cylinder

[Darrel <darrelK@domain.elided>]

Doug Rasmussen wrote:

> John L wrote:
> Due to the action of the rubber o-ring seal contained inside the caliper,
> disc brake calipers are designed to retract *slightly* each time the brake
> pedal is released.  When the pedal is released, as far as I know, pressure
> from the master cylinder is *not* maintained against the caliper.<
>
> John,
>
>   As I understand it, pressure is not *normally* maintained on disk brake
> systems.
> It is maintained on drum brake systems though.  Occasionally, on brake
> system conversions the street rodders will have to put a Wilwood residual
> pressure valve (2 psi) into the system to cure excessive pedal travel
> problems.
>
>   I agree with your advice to Mike A.  The stock proportioning valve has
> has no function in his system.  He definetly needs one of the aftermarket
> adjustable flow restrictors.
>
> Doug

Doug,
It's dangerous to run without a stock type proportioning valve! Regardless if
you have a aftermarket valve or not.

Darrel Kline
Colorado Springs