Car Problem Reports
GMC Acadia Brake booster failure due to internally leaking brake master cylinder
GMC Acadia Problem
Average Mileage: 79,760 mi (66,666 mi - 102,000 mi)
Visitor, 2009 GMC Acadia, 78,000 mi
I got a msg on my dash that read "stabilitrak off", then "check brakes". Took it in & they tell me the master cylinder was leaking brake fluid & it leaked right onto the brake booster (design flaw maybe?) so I had to replace both master cylinder & booster to the tune of $1100! Not too happy with it at all. Definitely won't be purchasing another GM vehicle in the future! Never had any issues with my Honda. Should've stuck with them!
Internal brake fluid leak. Master cylinder and brake booster to be replaced at a very high price!
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.
Brake fluid leaking toMaster cylinder
Alarms stabilitrak off & service brake system
Visitor, 2007 GMC Acadia, 80,000 mi
No noticeable problem but cant pass inspection due to leak on master cylinder into booster pump. Cost by dealership. $615.
Visitor, 2008 GMC Acadia, 67,000 mi
leaking internal brake master cylinder to the booster
Visitor, 2008 GMC Acadia, 75,000 mi
Visitor, 2007 GMC Acadia, 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?