Proportioning Valve

[ttuburbo]

Forgive me oh Gods of the Chevy world. Where is the proportioning valve located on a 1984 chevy suburban 1/2 ton. I just did 44/14 swap and the rears dont wanna stop. Its getting pressure cause the calipers are moving, but not enough to stop it. Im thinking it could be the prop valve. School me

 

[dhcomp]

My guess is that you need to bleed the lines better. Sometimes you have to mess with those valves, but not as often as you would think.

This is coming from teh guy that is leaving work to go home and bleed brakes fro the first time though.....so take it for what its worth.

 

[dyeager535]

If the calipers are moving, the prop valve is fine. It cuts off flow to front or rear when it "thinks" there is a leak on either end.

Bleeding it is, assuming your master didn't decide to die. If your brake light works as it should (triggers when the brakes lose pressure) then it's probably not your master cylinder, assuming you didn't leave a brake light comment out.

 

[cdoggwsu]

Bleed until you are certain that you've done it enough...then bleed 'em one more time.

Start from the caliper furthest from the master cylinder and work your way to the closest; in other words from the rear passenger side>>rear driver's side>>front passenger side>>front driver's side.

 

[onetonbb74]

the proportioning valve on the burb should be on the backside of the front crossmember under the fan shroud. Probably the worst place GM could have put it.

On my truck, the line going from the T-fitting on the axle to the pass side caliper is the shortest, this makes the drivers-side rear is the farthest from the m/c. Id start there and bleed away. hth.