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1988 GMC Brigadier service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.
Designed for technicians and DIY owners, this manual helps you troubleshoot accurately, follow step-by-step repair procedures, and reference wiring diagrams and system sections quickly while you work.
THE REAR AXLE RELAY VALVES (ONE PER AXLE) MAY NOT MEET BRAKE RELEASE TIMING REQUIREMENTS OF FMVSS 121.
THE REAR AXLE BRAKES MAY NOT RELEASE IN THE TIMESSPECIFIED BY FMVSS 121.
REPLACE THE NONCOMPLYING RELAY VALVES.