The problem
On the involved vehicles, the nuts which attach the brake master cylinder to the hydro-boost unit may have been over-tightened. This could have caused stripped threads and cracked attaching flanges. Should these nuts fail, the parts may separate and loss of service brakes would result.
The fix
Dealer will inspect for cracks in the attaching flanges; units with cracks present will be replaced. If no cracks are found, the studs will be removed and the holes drilled out. The unit will be reassembled using bolts and nuts in place of the existing studs.
Contacts
Vehicle description: light trucks.System: service brakes; master cylinder to hydro-boost unit attaching nuts.Consequences of defect: loss of braking capability could occur without priorwarning and could cause loss of vehicle control and an accident.
What to do
- Check your VIN. Enter it at nhtsa.gov/recalls - it shows whether this recall applies to your vehicle and whether the repair has been done.
- Call a dealer. Any authorized Chevrolet, GMC dealer will do the repair free, whether or not you bought the vehicle there. Quote campaign 77V119000.
- Ask about parts and a loaner. If parts aren't available yet, ask what to do in the meantime.
- Keep your paperwork. If you paid for this repair before the recall, you may be able to get reimbursed - here's how.