Adjustable Brake Proportioning valve

[Auggie56]

Just what does a PV actually do? I have rear brake lockup under heavy braking. Does it reduce volume or pressure? I bought one off EB and now, even adjusting the valve up and down no fluid is getting past that valve. To me pressure reduction would be what I'm looking for, as volume will still have the same pressure in brake system.

Any suggestions as to a valve you have experience with?

 

[jimbosride]

Me thinks you have a valve issue. Jack up car and close the valve. apply brakes and see if the rear will spin? Then open the valve until it starts to grab.

Take the car out and adjust until the back wheels brake where you want them set. if the car has a factory PV for disc brakes adding an adjustable will not work right.

4 wheel drum brakes have no PV.

But I maybe wrong on this?

 

[WileERobby]

It limits the pressure that goes to the rear brakes.