When im approaching a stop and i start pressing the btake the rpm moves up. Whats happening?

Asked by Jun 22, 2016 at 12:00 AM about the 2014 GMC Sierra 1500 SLE Crew Cab

Question type: Maintenance & Repair

2 Answers

26,515

check for a vacuum leak...

98,345

Sounds like you have a brake booster starting to fail, try this start the engine and let it idle for a bit then shut it off, when is quiet slowly step, but n the brake pedal and listen for a hissing sound, if you hear one then the booster is leaking and will need replaced. HTH

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