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Old 04-28-2013, 07:46 PM
mtc111009 mtc111009 is offline
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88 GMC C2500 Brake problems
Hi have a 1988 gmc c2500 with brake problems. the front brakes keep locking up both sides. Have replaced the calipers rotors pads and the brake lines. I can bleed them off and they release but has soon has you it the brakes they loock up again. Im at wits end any help would be great thanks.
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Old 04-29-2013, 09:50 AM
maxwedge maxwedge is offline
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Re: 88 GMC C2500 Brake problems
Brake hoses were replaced, no? Any work done on the master or booster, then this happened? Do you have Hydro-Boost.
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Old 04-30-2013, 07:35 PM
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Re: 88 GMC C2500 Brake problems
Yes lines were replaced nothing done to the master or booster
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Old 04-30-2013, 07:36 PM
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Re: 88 GMC C2500 Brake problems
no hydro boost
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Old 05-01-2013, 01:24 PM
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Re: 88 GMC C2500 Brake problems
Ok, when the brakes lock up, disconnect the vacuum hose to the booster see if they free up.
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Old 05-02-2013, 09:14 AM
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Re: 88 GMC C2500 Brake problems
Hi tried the line going to the booster they still stay lock up after taking off the air line
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Old 05-02-2013, 09:38 AM
maxwedge maxwedge is offline
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Re: 88 GMC C2500 Brake problems
Are you sure the hoses were replaced you keep saying lines? Also make sure there is at least 1/8-1/4 free travel in the brake pedal.
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Old 05-05-2013, 11:20 PM
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Re: 88 GMC C2500 Brake problems
yes hoses were replaced and i have 1/8 to 1/4 travel in the pedal.
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Old 05-06-2013, 08:50 AM
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Re: 88 GMC C2500 Brake problems
Possible the proportioning valve is bad and holding pressure, not much else left.
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