Vehicle recall 86V086000 · July 7, 1986
Chevrolet B6P042 and GMC B6P042
Severe brake chatter may cause the brake chamber mounting brackets on either side to develop cracks in the weld area where the s-cam shaft tube attaches to the chamber support…
Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.
- Summary
- Severe brake chatter may cause the brake chamber mounting brackets on either side to develop cracks in the weld area where the s-cam shaft tube attaches to the chamber support section. Consequence of defect: brackets can break, resulting in loss of braking ability at the front wheel, and possibly restrict steering, which could lead to a vehicle crash without prior warning.
- Remedy
- As necessary, replace front brake chamber mounting brackets and install a front brake limiting valve.
- Notes
- System: brakes. Vehicle description: school buses equipped with a 7500 lb. Front axle and without a front brake limiting valve.
Recall details
- NHTSA campaign
- 86V086000
- Reported to NHTSA
- July 7, 1986
- Filed by
- GENERAL MOTORS CORP.
- Owner notification
- August 15, 1986
- Vehicles potentially affected
- 4,299
- Initiated by
- the manufacturer
- Components
- Service brakes, hydraulic › Fluid
Vehicles covered
As listed by NHTSA. A recall usually covers only some vehicles of each model and year, often a production date range.
- Chevrolet B6P042 (1983-1986): 1986, 1985, 1984, 1983
- GMC B6P042 (1983-1986): 1986, 1985, 1984, 1983
Has your Chevrolet been repaired?
Recalls here come from NHTSA’s records for the model and year. Not every vehicle of a model is included in every recall, and this site can’t see whether a repair has been done. Only a VIN lookup can tell you that.
NHTSA’s VIN search doesn’t show recalls that were already repaired, recalls more than 15 years old, or some small manufacturers’ recalls. A Chevrolet dealer can also check your VIN. Recall repairs are free.