NHTSA Campaign Id 87V121000; Date: Aug. 3, 1987
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.
1983 Chevrolet B6P042; 1984 Chevrolet B6P042; 1985 Chevrolet B6P042; 1986 Chevrolet B6P042; 1987 Chevrolet B6P042; 1983 GMC B6P042; 1984 GMC B6P042; 1985 GMC B6P042; 1986 GMC B6P042; 1987 GMC B6P042
Component: Service Brakes, Air:drum:chamber
Manufactured by: General Motors Corp.
Affected Units:: 7,870
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.
As necessary, install new reinforced front brake chamber mounting brackets and install a front brake limiting valve on vehicles without one.
System: brakesvehicle description: school buses equipped with 7,500 lb. Front axle and mediumduty trucks equipped with a 7,000 lb. Front axle.
Date Owners notified by Manufacturer: Aug 6, 1987
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