break proportion valve bad

10

Asked by 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

97,115

You didn't state what year, but wrecking yard valves tend to have problems, have you checked for an aftermarket valve?

10

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.

Your Answer

Add photo

Related Questions

  • break proportion valve bad 2 answers

    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 replac...

    GMC Sierra 1500

    -

    Maintenance & Repair

  • Heater control valve 1 answer

    I have a 94 GMC Sierra 1500, I have replaced the heater core 3x the thermostat 2x and she is still not blowing out hot air, I need to know where the heater control valve is located

    1994 GMC Sierra 1500 C1500 SL Standard Cab LB

    -

    Maintenance & Repair

  • Is my truck going to break down again? 1 answer

    So I have a 95 GMC Sierra 4x4 with the 5.7 In it. When I was pulling in to Taco Bell today it died on me, I tried to start it and it would try to turn over but wouldn't start. I thought it might ...

    1995 GMC Sierra 1500

    -

    Maintenance & Repair

  • Firing problems missing bad

    I replaced the flywheel and the converter put it all back together and now it's missing real bad

    1993 GMC Sierra 1500 C1500 Extended Cab LB

    -

    Maintenance & Repair

  • Emergency break

    I have a 1999 GMC Sierra the E break has never worked but we need to pass a safety inspection and everything passed but the E break so we replaced the shoes all the lines we have had then adjusted...

    1999 GMC Sierra 1500

    -

    Maintenance & Repair

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 5,270
#2 John Saffrahn
John Saffrahn
Reputation 3,640
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 3,330
View All

Related Models For Sale

Used Chevrolet Silverado 1500
1,935 Great Deals out of 182,327 listings starting at $999
Used Ford F-150
2,088 Great Deals out of 192,330 listings starting at $290
Used GMC Sierra 2500HD
129 Great Deals out of 12,674 listings starting at $2,995
Used Toyota Tundra
415 Great Deals out of 34,266 listings starting at $1,950
Used Dodge Ram 1500
399 Great Deals out of 10,886 listings starting at $1,000
Used Ram 1500
950 Great Deals out of 112,605 listings starting at $5,386
Used Toyota Tacoma
548 Great Deals out of 42,266 listings starting at $1,995
Used GMC Yukon
417 Great Deals out of 20,457 listings starting at $1,495
Used Chevrolet Silverado 2500HD
326 Great Deals out of 28,527 listings starting at $990
Used Chevrolet Tahoe
588 Great Deals out of 33,016 listings starting at $1,500
Used Ford F-250 Super Duty
330 Great Deals out of 43,931 listings starting at $1,450
Used Chevrolet Camaro
373 Great Deals out of 31,227 listings starting at $2,500
Used GMC Canyon
101 Great Deals out of 11,880 listings starting at $3,500
Used Chevrolet Colorado
250 Great Deals out of 27,517 listings starting at $1,000
Used Nissan Titan
175 Great Deals out of 18,876 listings starting at $3,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.