GMC Sierra owners have reported 2 problems related to brake differential proportional valve (under the service brakes category). The most recently reported issues are listed below.
I took my truck in for the state inspection. . . Kept failing due to brakes after changing the brakes it failed on the e-brake, that we have never used, when checked the was no e-brake pad on one side and you can see where it has worn, the cable does not even tighten like it is supposed to. . . For something we do not even use I do not understand how it can be this bad. I still have the e-brake we changed on my 2001 GMC Sierra.
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all problems of the 2001 GMC Sierra
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On four separate occasions my 1999 GMC Sierra had problems braking cause close collisions. When pressing on brake at low speeds to come to a stop brake pedal was hard to press down. Seemed like brake booster went out. Had to apply extream amount of pressure on the brake to avoid collision. Had vehicle checked out by certified mechanic which found nothing after hooking up diagnostics test and also manually checking out brakes. Found nothing on computer to say why brakes failed. If anyone knows why this is please email me at krayztroy@aol. Com luckly there has been no collisions.
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all problems of the 1999 GMC Sierra
🔎.