Residual Pressure Valves

[Elliott99]

Hi, just fitted a VW Jim remote servo to my 1970 bus, which has aftermarket discs on the front, and original drums on the back.
I have removed the residual pressure valve from the front of the master cylinder, should I do the same with the rear one or leave it in circuit?
Thanks,
Elliott.

 

[subheatadey]

I would assume to take them out and fit a one way valve in the engine bay before the servo off the vac pipe

 

[Elliott99]

Thanks Subheatadey,
I will remove the rear brake RPV as well, I couldn't see any reason for it to stay with the servo set up, but I wanted some reassurance before I gutted the valve! Thanks also for the reminder about the one way valve on the vac side.

Elliott

 

[neilswheels]

One of the reasons BPRV's are used is when the servo is lower than the caliper or slave cylinder, as fluid can flow back out of these resulting in a slight delay in braking. BPRV's keep the fluid pressure. You also need different rating BPRV's for drum and disc/ front and back. They are used a lot in the streetrod/hotrod world