GMC B6P042 1986: SERVICE BRAKES, AIR:DRUM:CHAMBER

General Information

NHTSA Campaign ID Number: 87V121000

Make Model Year
GMC B6P042 1986
Date Owners Notified Date Received by ODI Date Added to Database
1987-08-06 1987-08-03 1987-08-07

Production Dates: 1982-10-01 - 1987-06-01

Manufacturers Involved: General Motors, LLC

Component: SERVICE BRAKES, AIR:DRUM:CHAMBER

Potential Number Of Units Affected: 7870

Report Initiator: MFR MFR Report

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.