Residual Pressure Valve placement

Donnie514 said

Wow, He ask a question about the residual valve, did he not?
Photos show a proportioning valve.
The reply's are getting crazy.
The most of ya are correct when you say the "residual valve is in the master cylinder"
I have been a ASE master tech for over 35 years and never heard tell of a residual check valve in a wheel cylinder. What would happen if you only changed one rear wheel cylinder?

Click to expand...

It's not a residual check valve in the wheel cyl, they just added the expander that goes in the cup of the wheel cyl. Pryor to the 70's the wheel cyls would leak fluid because there was no pressure on the cup to hold it tight in the bore when the car sat for a while. The addition of the expander would keep the cup tight at all times so there was no need for a check valve.