Proportioning Valve Keeps Tripping?

[72c20customcamper]

Originally Posted by KyleSeal

From what I can hear, they still actuate. I am doing this alone so I use my phone camera to see whats going on. With the switch in, it will only send the shuttle valve backwards a small amount, and still let fluid out. When I take the switch out, it will close them entirely. At this point, I have ordered a pressure bleeder to see if I can force some sort of hidden air pockets out.

Did you change the rear cylinders? May not be correct size for the system

[KyleSeal]

Originally Posted by 72c20customcamper

Did you change the rear cylinders? May not be correct size for the system

I had changed them out years ago, when I did the brakes in the rear and they operated at that time fine. That was years ago and when it was on the drum drum setup. But I couldnt imagine an issue there - as a lot of people do the disc drum conversion and I havent seen it notated that they touched the rear brakes at all.

[72c20customcamper]

Originally Posted by KyleSeal

I had changed them out years ago, when I did the brakes in the rear and they operated at that time fine. That was years ago and when it was on the drum drum setup. But I couldnt imagine an issue there - as a lot of people do the disc drum conversion and I havent seen it notated that they touched the rear brakes at all.

I would talk to the tech guy . The master may not be correct for your rear brake cylinder. Most places sell generic masters mostly for cars . If your rears are to large there may be a pressure differential between the disc and drum brake for a fraction of a second causing it to believe there is a leak in the rear circuit.

Maybe change out the portioning valve it could be defective.

[72c20customcamper]

Pretty sure c10 and c20 are different the front on my c20 goes to the rear reservoir on the master