I have a 77 cj7 and the stock porportioning valve is leaking. Instead of dropping $150 for a new one, I was thinking of using the generic adjustable style from summit. Are there any problems you guys no of with doing this? Thanks in advance.
Glad you posted this. I am doing the same thing right now and I haven't seen anything that indicates that there should be any problem doing it. I am trying to figure out a nice looking way to put that and a brake lock inside the cab.
No problems. I did it years ago. The adjustable prop. value is just installed in the rear brake line. The front brake line from the master cyclinder just gets split into the two lines and then straight to the front calipers.
After complete installation go out and attempt to lock up the brakes. Keep adjusting the prop valve until the rear lock up just before the front.
"some prop valves have warning switches in them. what is the correct way to bypass them? Disconnect the light on the dash?"
The (brake) warning light (in the speedo cluster) on a CJ shares a ground switch with the emergency brake ground switch. The lamp is hot and these switches illuminate the "brake" lamp when either switch (e-brake or proportioning valve) is grounded.
No action is needed if you replace the proportioning valve with an after market version ... you just will not receive a warning when you have a serious brake hydraulic line leak.
Vanco in CA re-manufacturers Jeep P-valve assemblies for $75 bucks if you want to stay with the OEM setup.