Got a letter that my vehicle had a recall on adas system. Took it in to get fixed. A week later was driving home from work on a straight away and Trucks brakes slammed from 50 to 15 then let up. The impact was like Someone hitting me from behind. Strained my neck and wrist. Because I was in shock it happened so looked around and there was only one truck 2 lanes on side of road. When the brake released I started driving again. 3 min later It then happened again. I was scared it would happen again so I drove home real slow. We took it back in to get fixed on [XXX] at the chevy service in hemet. Roger used a sensor reader showing brakes locked up twice. They said they checked it and because there was no issues showing. They didn't fix it. Roger said they drove it 10 miles and nothing happened I explained I have driven it 11000 miles and nothing happened until Last week. How can they send me away without fixing a very dangerous issue. As of today [XXX] it can still happen. I was lucky there was no cars behind me that day it would be a different story. Now I have to call GM to try and get them to tell hemet chevy to fix it so no one gets killed or hurt next time it happens. What ever happened to fixing the issue? INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)