March 1: GM Engine Failure Class Action Lawsuit Begins news | 7 days ago
February 28: GM Lifter Lawsuit Update: Motion to Sever Denied news | 8 days ago
February 21: GM Brake Booster Vacuum Pump Failures Cause Lawsuit news | 15 days ago
February 21: Recall: GM Rear Wheels Lockup While Driving recalls | 15 days ago
January 19: GM Engine Failure Recall Investigation Opened investigations | 48 days ago
GMC TSB #21NA089
2020 GMC Sierra 1500
TSB Document:
Affected Component: SERVICE BRAKES, AIR:DISC:CALIPER
- Summary
- This technical bulletin provides a procedure to replace the rear calipers if found packed for of mud and debris.
Click a tab for more information.




