Four problems related to brake master cylinder have been reported for the 2015 Chevrolet Suburban. The most recently reported issues are listed below.
The vehicle was serviced 3 weeks ago to update software related to a recall issue with the brake vacuum and degraded braking power. The brakes on the vehicle suddenly changed as I was parking making it hard to stop. I took the vehicle to the nearest dealer and I was told that the master cylinder and vacuum needed to be replaced. The dealer is charging me $686 for the master cylinder and told me that the vacuum replacement would be covered by gm but that the part has been in backorder for weeks with no eta. I had to fly back home and have no loaner car from gm claiming that the issue does not warrant a loaner, yet I have no idea when I will get by Suburban back. I filed a claim with gm and have yet to receive a call. Gm has known of this issue for years and has done nothing to adress it. The software fix did not work as I had my truck serviced 3 weeks ago. Gm needs to stand by their product and make sure they fix the braking issue ASAP or purchase their cars back due to the gravity of the safety issue.
While in line at toll booth at low speed the brakes were hard to push and slower to respond almost causing accident. Dealer found vacumn pump failed and oil backed up into vacumn booster and master cylinders.
Tl the contact owns a 2015 Chevrolet Suburban. While driving approximately 10 mph in heavy traffic, the vehicle lost all braking ability and the brake pedal traveled to the floorboard. Also, the brake warning indicator illuminated. The contact also stated that the failure occurred two other times. The vehicle was taken to Chevrolet 112 (2096 NY-112, medford, NY 11763) where it was diagnosed that the master cylinder failed and needed replacement. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 58,000.
While driving on i90 in stop and go traffic, the car in front of me stopped. I applied my brakes and the pedal was hard and would not depress. As a result my car would not stop and I hit the car in front of me in the rear end. My air bags went off. I received an air bag burn. The car in front of me struck the car in front of him. Both other drivers claim they were injured. My car cost $15,300 to repair. Chevrolet is aware of this problem, issuing preliminary service bulletin pit5361 in 2015, addendum b in 2016 and addendum b in 2017. The problem is a faulty vacuum pump, master cylinder, brake booster, vacuum line, and vacuum pump belt. I was never informed of this problem. I have been driving 50 years and this is my first chargeable accident.