2018 Buick Regal Brakes

My car was part of recall number 22V465, which was supposed to fix a problem with the electronic brake assist system. The recall repair was done in 2023, but after my battery recently died, the same problem has come back — my brakes are very firm, and I have to press hard to stop. The car is showing trouble codes C028F:04, C1586:04, and V0420:71, all related to the electronic brake control module.

Was driving home from work and my brakes suddenly stopped working, if I press all the way down on the brakes they somewhat work. Checked brake fluid and brake lines and everything seems fine. Could this be from vacuum power brake assist fail?

September 10, 2022 I was backing out of my driveway, but the car would not slow down, and I hit a tree on my neighbor's easement across the street. After a minute, I decided to move the car, put the car in drive, and again the car would not slow down, and wound up hitting the porch of my neighbor 2 houses over. I have used my left foot for braking since 1966, so it is not a case of mixing up pedals. My wife called 911, the police and ambulance showed up, and I was taken to the hospital. After x-rays, ultrasound, and 2 CT scans, it was determined that I did not have a brain bleed and I was sent home. The car was towed, examined by the insurance adjustor and body shop, and determined totalled. There were no warning lights, and only later that night did I remember that I had received a recall letter.

TL* THE CONTACT OWNS A 2018 BUICK REGAL. THE CONTACT PURCHASED THE VEHICLE IN FEBRUARY OF 2018, BUT DID NOT OBTAIN IT UNTIL JUNE 15, 2018. WHILE IN A DRIVE-THRU LINE, THE CONTACT REMOVED HIS FOOT FROM THE BRAKE PEDAL AND THE VEHICLE LURCHED FORWARD AND CRASHED INTO A POLE. THE FRONT DRIVER SIDE FENDER, BUMPER, AND HEADLIGHT WERE DAMAGED. THERE WERE NO INJURIES AND A POLICE REPORT WAS FILED. THE DEALER (GREINER BUICK GMC, 14555 CIVIC DR., VICTORVILLE, CA 92394) WAS CONTACTED AND REFERRED THE CONTACT TO AN AUTHORIZED BUICK BODY SHOP FOR THE DAMAGES. THE FAILURE WAS NOT DIAGNOSED BY THE DEALER. THE MANUFACTURER HAD NOT BEEN CONTACTED. THE FAILURE MILEAGE WAS 169. *TT