- 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.
Vehicle safety record
1977 GMC C30 Problems, complaints & recalls
No owner complaints about the 1977 GMC C30 have been filed with NHTSA. It is covered by 1 recall, the latest in August 1977 for the vacuum.
NHTSA data checked
BFewer problems than a typical C30 year, for its age
- Complaints
- 0
- Recalls
- 1
- Crashes
- 0
- Fires
- 0
- Injuries
- 0
- Deaths
- 0
1977 GMC C30 recalls 1
Recall repairs are free. Your dealer fixes them whether or not you bought the car there - check your VIN at nhtsa.gov/recalls to see if yours is done. What to do
What owners say
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No complaints about the 1977 GMC C30 yet
No owner has filed a complaint about this vehicle with NHTSA. If yours has a problem, share it here and report it to NHTSA.
GMC C30: every year compared
All C30 yearsQuestions about the 1977 GMC C30
Does the 1977 GMC C30 have any recalls?
Yes - NHTSA lists 1 recall for the 1977 GMC C30: vacuum (August 1977). Recall repairs are free at any authorized dealer. Enter your VIN at nhtsa.gov/recalls to see whether yours has been fixed.
How many complaints has the 1977 GMC C30 had?
None have been filed with NHTSA so far.
Is the 1977 GMC C30 a reliable vehicle?
Its Safety Index is 65 out of 100 (grade B: fewer problems than a typical GMC C30 year, for its age). The index weighs complaints, crashes, fires, injuries, deaths and recalls against how long the vehicle has been on the road, compared with the same model's other years. It is not a measure of every repair - read the complaints and owner experiences, and have any used vehicle inspected before you buy.
What should I do if my 1977 GMC C30 has a problem?
If it is a safety problem, stop driving it if it is unsafe and contact your dealer. Report it to NHTSA at nhtsa.gov/report-a-safety-problem - enough reports start investigations and recalls - and share your experience here so other owners know what to look for.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked . Complaints are owners' own reports and are not verified. How we use the data