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

RepairPal Verified
Average mileage: 118,182 (44,000–680,000)
5 model years affected: 2007, 2008, 2009, 2011, more2012
25 people reported this problem
18 people shared problem details
2009 GMC Acadia78,000
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!
6 people like thisFlag inappropiate
Internal brake fluid leak. Master cylinder and brake booster to be replaced at a very high price!
5 people like thisFlag inappropiate
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.
5 people like thisFlag inappropiate
Same scenario stabilizer light off and check brake indicator. Master cylinder leaking in tobrake booster $900 repair bill. Obviously a design issue will not buy another GMC product.
1 person likes thisFlag inappropiate
2008 GMC Acadia67,000
leaking internal brake master cylinder to the booster
1 person likes thisFlag inappropiate
Brake fluid leaking toMaster cylinder Alarms stabilitrak off & service brake system
1 person likes thisFlag inappropiate
2007 GMC Acadia680,000
Internal brake fluid leak and master cylinder and brake booster to be repaired only had this vehicle for six months!!
2008 GMC Acadia107,000
Haven't noticed any apparent leaking on garage floor but after getting transmission problems fixed, which was a dealer flaw, they discovered that my master brake cylinder and brake booster needs to be replaced.
2007 GMC Acadia135,000
stabilitrack off and service brake system light coming on leaking on garage floor from the rear of vechicle.
2008 GMC Acadia58,600
problem with brake booster full of braks fluid from master cylinder leak $1200.00 repair talked to GM found no satisfaction on repairs even service rep said it is a problem he has seen a lot no help from GM. not buying another GM toyota looking better all the time
2011 GMC Acadia44,000
At such low mileage it is extremely disappointing to have this same problem (at the tune of $1000), which naturally started just after the warranty period expired. I am also experiencing the steering wheel noise problem($1400)and noises from worn out lower control arm bushings($800). My recommendation is either not buy a GM (government motors)vehicle or unload it before the end of the warranty period. You can also get the 2 year extended warranty for about $3500. I will never buy another GM vehicle again.
2008 GMC Acadia150,000
Same problem stability light and traction control light. Said master cylinder leaked into booster and both have to be replaced $1100.
Service stability light comes on
2009 GMC Acadia100,000
Brake cylinder $500
2008 GMC Acadia88,500
Stabilitrac message light came on - Master Cylinder and brake booster replacement required.
2007 GMC Acadia80,000
No noticeable problem but cant pass inspection due to leak on master cylinder into booster pump. Cost by dealership. $615.
2008 GMC Acadia75,000
$1989.00 LATER.
2007 GMC Acadia102,000
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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