break proportion valve bad
10

Asked by Henryp39 Mar 05, 2016 at 06:00 PM about the GMC Sierra 1500

Question type: Maintenance & Repair

when I step on my brakes the brake calipers
lock up in the front, really bad the first time
and won't release, I completely flush the
system several times with brand new dot3
brake fluid, I replaced both calipers on the
front, no luck, I replace both rubber brake
lines in the front, no luck, I completely
rebuilt the break master cylinder, still
locking up, when I open the proportioning
valve while the calipers are locked up they
release, is my proportioning valve bad? and
what are everyone's thoughts on getting
one from a junkyard I've heard bad news?

2 Answers
10

Henryp39 answered 8 years ago

1991. brand new ones are about $110 plus the shipping each, I'm taking apart the proportion valve now, can't seem to loosen the threads to the back brakes, it's a SOB, I had some rust bolt loosening oil which I squeezed on it, I took the front and rear springs out of the proportioning valve but if you look into the middle where the brake light sensor is if it grounds, it looks all black and gooey I'm trying to get everything out and then clean it put it back together.

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10

MindaugasR answered 6 years ago

Hey We have LVD machine PPI 135/42 made in 1995years, we're getting error "Axis doesn't reach the imposed speed (Y1). As we found out, the problem is proportion valve. Where could we get schemes of it in order to find it? If anyone can help, contact me: mindaugas.raudzius@norac.lt

1 people found this helpful.
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