GMC Jimmy owners have reported 3 problems related to power assist brake (under the service brakes category). The most recently reported issues are listed below.
When braking the brakes make a noise and have lost vacuum power and gone straight to the floor numerous times. The first time was when attempting to brake when going down an incline to turn into a parking lot. A slight bump when braking and the brake pedal went to the floor. A few seconds later, I was able to brake again. This has happened more often on wet or slippery surfaces. On 07/21/00 I was in a parking lot when another car was pulling in front of me. The surface was still wet and slippery and when braking, the brake pedal made a noise and then all braking ability is lost, the brake pedal goes to the floor. Luckily there was no accident. This problem has happened to me numerous times. I brought my vehicle in for the abs recall the end of 1999 and told the dealership about the problem. They couldn't find anything wrong. I travel a lot with my family and a braking problem is very scary!!!.
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all problems of the 1996 GMC Jimmy
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When driving at highway speed and when turning a corner at 15 mph, applied the brakes, and abs system kicked in, causing the vehicle to slide. Also, power brake systmem went and transmission went failed. In addition, dealer replaced the brake pads.
Brake vacuum booster failed.