Item Affected: SERVICE BRAKES, AIR:CONTROLS
Date Announced: 07/24/1989
Description of Recall: THE REAR AXLE RELAY VALVES (ONE PER AXLE) MAY NOT MEET BRAKE RELEASE TIMING REQUIREMENTS OF FMVSS 121.
Conequence: THE REAR AXLE BRAKES MAY NOT RELEASE IN THE TIMESSPECIFIED BY FMVSS 121.
Action Need To Fix It: REPLACE THE NONCOMPLYING RELAY VALVES.
Notes: SYSTEM: REAR AXLE AIR BRAKE RELAY VALVES/FMVSS 121.VEHICLE DESCRIPTION: HEAVY DUTY TRUCKS.