Car Problem Reports

GMC Acadia Brake booster failure due to internally leaking brake master cylinder

 
GMC Acadia Problem
6 Reports
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Model Years Affected: 2007, 2008

Average Mileage: 78,444 mi (66,666 mi - 102,000 mi)

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  • Profile_thumbnail
     Journeyman

    Service brake system message, sometimes Service Stability, red brake light and TRAC OFF message.
    These are sometimes the result of low brake fluid, but no obvious leaks are noted. Due to the design of the master cylinder and brake booster, the master cylinder can leak from the rear seal and collect inside the booster, leaving no drops on the ground or obvious signs.

    You will need to replace the master cylinder and booster to correct.

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  • Visitor, , 75,000 mi

    $1989.00 LATER.

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  • Visitor, , 102,000 mi

    Brake works fine sometimes, but just started failing last week. I apply the breaks and it goes all the way down but car does not stop. Need to pump brake and then it stops. It freaks me out! Diagnosis is to replace booster and master cylinder for $714 at dealership. Not fun since just replaced the transmission at 101K mi for same Acadia for $3,300. What's next?

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  • Brenb, , 70,000 mi
     Rookie

    Brake fluid leaking toMaster cylinder
    Alarms stabilitrak off & service brake system

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  •  Rookie

    Internal brake fluid leak. Master cylinder and brake booster to be replaced at a very high price!

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