Vehicle recall 87V121000 · August 3, 1987
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
- Brackets can break, resulting in loss of braking abilityat that front wheel, and possibly restricted steering, which could lead to avehicle crash without prior warning.
- Remedy
- As necessary, install new reinforced front brake chamber mounting brackets and install a front brake limiting valve on vehicles without one.
- Notes
- System: brakesvehicle description: school buses equipped with 7,500 lb. Front axle and mediumduty trucks equipped with a 7,000 lb. Front axle.
Recall details
- NHTSA campaign
- 87V121000
- Reported to NHTSA
- August 3, 1987
- Filed by
- GENERAL MOTORS CORP.
- Owner notification
- August 6, 1987
- Vehicles potentially affected
- 7,870
- Initiated by
- the manufacturer
- Components
- Service brakes, air › Drum › Chamber
Vehicles covered
As listed by NHTSA. A recall usually covers only some vehicles of each model and year, often a production date range.
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