SERVICE BRAKES, AIR:ANTILOCK
Aug 18, 1992
414 units potentially affected
The defect: THE TWO (2) RELAY SERVICE VALVES ARE CONNECTED TO THE SAME RESERVOIR RESULTING IN 4.25 TIMES, RATHER THAN 8 TIMES, THE COMBINED VOLUME OF ALL CHAMBERS AT MAXIMUM TRAVEL. THIS DOES NOT COMPLY WITH FMVSS 121, "AIR BRAKE SYSTEMS."
The risk: REPEATED MAXIMUM BRAKE APPLICATIONS CAN RESULT IN THEACTIVATION OF THE LOW PRESSURE WARNING SYSTEM AS THE RESERVOIR IS DEPLETED ATHIGHER THAN SPECIFIED RATE.
The remedy: CHANGE ONE OF THE RELAY SERVICE VALVE SUPPLY LINES TO THE SECOND RESERVOIR.
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