- The problem
- Delays of up to about 2 seconds may exist in the brake application times to the brakes on the bogie axles in the presence of certain types of wheel speed sensor signal discontinuities or distortions that may occur as a result of sensor wire failure. This constitutes a non-compliance to federal motor vehicle safety standard no. 121, "Air brake systems".
- The fix
- Dealer will install new wheel speed sensors that incorporate improved wiring and the present bogie anti-wheel lock system will be changed to an axle-to-axle system for improved reliability.
Vehicle safety record
1977 Mack MB Problems, complaints & recalls
No owner complaints about the 1977 Mack MB have been filed with NHTSA. It is covered by 4 recalls, the latest in October 1978 for the interconnecting assembly(wiring).
NHTSA data checked
DMore problems than a typical MB year, for its age
- Complaints
- 0
- Recalls
- 4
- Crashes
- 0
- Fires
- 0
- Injuries
- 0
- Deaths
- 0
1977 Mack MB recalls 4
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
- The problem
- The existing cross steering arms may have insufficient fatigue life in the neck area. This is near the boss for the cross steering tube ball joint connection. Failure of either of the cross steering levers could lead to loss of steering control of the right front wheel.
- The fix
- The dealer will inspect and, if necessary, install cross steering arms of improved design and greater strength.
- The problem
- A deficiency exists in the welds securing the rear spring insulator bracket to the axle housing. This is due to improper positioning of the weld, in relationship to the bracket and axle housing. Failure of the welds would cause separation of the spring insulator bracket and the axle housing, resulting in improper alignment of the affected axle.
- The fix
- Dealer will reweld the insulator spring bracket at no cost to owner.
- The problem
- The front wheel rim clamp studs, installed on the involved vehicles, may not have been manufactured correctly, causing a brittle condition in the thread root area. The studs could eventually crack and break when wheel nuts are tightened to specifications.
- The fix
- The dealer will replace all suspect front wheel studs, without charge to owner.
What owners say
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No complaints about the 1977 Mack MB 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.
Mack MB: every year compared
All MB yearsQuestions about the 1977 Mack MB
Does the 1977 Mack MB have any recalls?
Yes - NHTSA lists 4 recalls for the 1977 Mack MB: interconnecting assembly(wiring) (October 1978); arm (August 1978); hanger / bracket (November 1977); wheels (June 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 Mack MB had?
None have been filed with NHTSA so far.
Is the 1977 Mack MB a reliable vehicle?
Its Safety Index is 39 out of 100 (grade D: more problems than a typical Mack MB 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 Mack MB 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