Question about 1999 GMC Sierra

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1986 gmc sierra 1500 front rt brake locks up

I have replaced the caliper and the proportional valve. After applying the brakes several times the rt front locks up. I have bled all 4 and the only way to release the front rt is to open the bleed valve on the caliper. Could it be a brake line or master cylinder? All other brakes seem OK.

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  • Anonymous Jan 12, 2009

    I've got a 1985 GMC 1ton I've replace the Hydro Booster, MC, Front break lines and the Calipers, After hitting the breaks the front wheels lock up. and the peddle want come all the way up HELP ME PLEASE................

  • AmberLeigh4u Mar 18, 2009

    I have a 97 with the same problem.Changed the rotor .pads,caliper and berings..blead the brakes and now the driver front is locked up.When bleeding the air I can see the capiper trying to bounce back but not back enough to keep it from locking..also put my hand on the proportion valve where there is a rubber cap and that seem to be working..what could I replace next? Amber

  • Anonymous Mar 16, 2014

    my cargo van lockout the driver side caliper when brake all the time some vary sed to mi than the hidraulic valve unit is damaged i replaced all ready master cylinder brakes hoses ,calipers, speed, sensors ,bleeded all system and not works what i can do please?

  • Anonymous Mar 30, 2014

    I am wondering if my master causing this problem or do I need look at something between master and brake calipers

  • Anonymous Mar 30, 2014

    Was wondering if my master cylinder is bad or is there something else between the master and the brake calipers needs to be looked at

  • Anonymous Apr 01, 2014

    My 02 GMC Sierra 1500HD brakes will slowly put themselves on and then lock up. I then have to stop and put the brake pedal right to the floor for a minute then it releases and is good. The power steering pump has a little whine to it when the motor is reved up.

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  • 9 Answers

Check brake lines they may have gotten pinched very commonok new c/k trucks when you crank the torsion bars up to far you may have hit something and pinched the brake line check those before messing with the master cylinder those are a real pain

Posted on Sep 21, 2008

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How do I check and/or find a brake proportional valve oem replacement part for a 1999 Lincoln Continental


proportional valves are designed to give the right amount of hydraulic pressure to the back brake to prevent them locking up with a resultant loss of control of the vehicle
replacement of calipers would only be need once to fix jammed or leaking pistons but the pads may have to be replaced more often.
if it only the front brakes that is the problem ,I suspect that the fault will be in the compensating ports of the master cylinder that is not releasing the fluid back into the reservoir and the resultant heat build up from the pads still in contact with the discs is building up brake pressure and so keeping the pads on the discs to the point where lock up is evident
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If parts are not available from the manufacturer spares department, they should be still be available from reputable brake shops as car manufacturers do not make brake parts as such but rely on brake manufacturers to supply items to specifications
the unit will be repairable by an accredited shop and failing that would be available from the wreckers.

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