AN INCORRECT RATIO RELAY VALVE WAS INSTALLED IN THE BRAKE SYSTEM AND THE PRESSURE PROTECTION VALVE WAS INSTALLED INCORRECTLY.
Consequence
INCORRECT INSTALLATION OF THE VALVES WOULD REDUCE THE AVAILABLE RESERVOIR CAPACITY BY ONE HALF, RESULTING IN LOSS OF NORMAL BRAKING FUNCTION AND COULD CAUSE APPLICATION OF THE SPRING BRAKES, WHICH COULD EFFECT THE OPERATION OF THE TRUCK AND RESULT IN AN ACCIDENT.
Remedy
REPLACE THE BRAKE RELAY VALVE AND RE-ORIENT THE PRESSURE PROTECTION VALVE.
SYSTEM: BRAKE RELAY VALVE, FMVSS 121.VEHICLE DESCRIPTION: TANDEM AXLE VAN TRAILERS.CAUTION: DRIVING IN CIRCUMSTANCES WHICH WILL REQUIRE NUMEROUS BRAKE APPLICATIONS[E.G., DESCENDING LONG STEEP GRADES IN A SHORT TIME] SHOULD BE AVOIDED UNTIL THE DEFECT IS REMEDIED.WARNING OF THE REDUCED RESERVOIR PRESSURE SHOULD BE HEEDED FOR LOSS OF NORMAL BRAKING FUNCTION, AND PRECAUTION TAKEN.
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