NHTSA Complaint #11601801 — 2013 CHEVROLET VOLT

While driving, the car developed a brake malfunction. when the brake pedal is depressed you can feel the pedal pulsating and was not slowing down until you pressed harder then the brakes apply abruptly causing risk of rear ending. Upon pulling over to the hard shoulder the pedal pulsating/drumming continued to happen even though the car is completely stopped and is in parking gear. The symptom is similar to the service bulletin PIC5734A. [XXX] The car was driven to the nearest dealership 'Dublin Chevorlet' in Dublin CA and the car has been there for 4 weeks since GM is unable to help resolve the problem. I have reached out to GM and opened a support case. Case number [XXX] ]. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)