GMC Sonoma owners have reported 2 problems related to power assist brake vacuum (under the service brakes category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of GMC Sonoma based on all problems reported for the Sonoma.
Power brake booster failed making hte brake pedal diffucult to depress, even when depressed the brake do not function properly. Nlm.
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When traveling and upon depressing the brake pedal, the vehicle becomes very difficult to stop. Pedal gets very hard to depress, causing extended stopping distance due to the power assist booster which needed replacement. Consumer has contacted the dealer, dealer has replaced the brake booster pump.