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View Full Version : Brake Propotioning Valve Questions


Jon78J10
09-27-2001, 09:52 AM
I'm having trouble getting good brake pressure on my '78 J10. I've tried bleeding the brakes several times, checked all hoses; wheel cylinders and master cylinder are new.

I've read that you have to set the brake proportioning valve in a certain position to bleed the brakes correctly. My valve is a type W, so I'm supposed to pull the pin out while bleeding the brakes(?). The pin is fairly small, and I can't imagine how I would pull it out with a pliers while I bleed the brakes. Any ideas?

I also took the valve off and cleaned it up. I noticed that there is a black rubber seal toward the back of the valve, just below the hole for the upper mounting bolt. The seal seems to be punctured. Is this correct, or should I seal it?

Sitting Bull
09-27-2001, 10:08 AM
Just attach a pair of vise-grips to the pin, otherwise, you'll never get the air out. As for the seal, I'll check mine tonight, I was going to bleed my brakes this weekend anyway.