Reported risk: 1989-90 "L-SERIES" TRUCKS AND CHASSIS CABS.
PRESSURE LOSS IN THE AIR BRAKE PRIMARY SERVICE RESERVOIR COULD RESULT IN LOSS OF PRESSURE IN THE SECONDARY SERVICE RESERVOIR DUE TO A DEFECTIVE SECONDARY SERVICE RESERVOIR AIR PRESSURE CHECK VALVE. THIS COULD RESULT IN LOSS OF SERVICE BRAKES AND A POSSIBLE CRASH WITHOUT PRIOR WARNING. THE REAR SPRING BRAKES WOULD APPLY IF THE PRIMARY SERVICE RESERVOIR PRESSURE DROPPED BELOW 60 P.S.I.
CORRECTION: REVISED DESIGN SECONDARY SERVICE RESERVOIR CHECK VALVE COMPONENTS WILL BE INSTALLED ON AFFECTED VEHICLES.
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