GMC Suburban 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've had this vehicle in for brake repairs at least 6 times since I bought it. It now has 26,500 miles. The brakes have been replaced 4 times, master cylinder replaced, proportioning valve replaced, and right side caliper replaced. I have also had the following replaced: motor pulley, a/c compressor, tie rod, idler arm, pitman arm, coil in steering column, main belt, front differential gasket. Every time I take it in to the dealer, it seems that I am a pest. . . . . . . . I will never own another GMC product, and I am seeking legal advice for a possible manufacturer buyback.
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all problems of the 1999 GMC Suburban
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On 4 separate occassions consumer has had to take vehicle in for excessive grinding noise from rear brakes when coming to a stop, also there was leaking proportioning valve that caused premature wear to rear brakes.