AN INCORRECT RATIO RELAY VALVE WAS INSTALLED IN THE BRAKE SYSTEM AND THE PRESSURE PROTECTION VALVE WAS INSTALLED INCORRECTLY.
RiskINCORRECT 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.
FixREPLACE THE BRAKE RELAY VALVE AND RE-ORIENT THE PRESSURE PROTECTION VALVE.