WHITE TRUCK RB2 1977: SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE

General Information

NHTSA Campaign ID Number: 78V132000

Make Model Year
WHITE TRUCK RB2 1977
Date Owners Notified Date Received by ODI Date Added to Database
1978-07-21 1978-06-12 1979-10-12

Production Dates: 1977-05-01 - 1978-02-01

Manufacturers Involved: Volvo Trucks North America

Component: SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE

Potential Number Of Units Affected: 39

Report Initiator: MFR MFR Report

Regulation Part Number: 571

Federal Motor Vehicle Safety Standard Number: 121

Summary

THE INVOLVED VEHICLES MAY HAVE BEEN BUILT WITH POWER UNIT ANTI-SKID LOGIC MODULES ON TAG AXLE INSTALLATIONS INSTEAD OF THE CORRECT TRAILER TYPE MODULES. SINCE THE TAG AXLE SENSOR OUTPUT IS LESS THAN THAT OF THE POWER UNIT SENSOR, IT REQUIRES THE MORE SENSITIVE TRAILER MODULE. AS SENSOR OUTPUT OVER TIME DROPS BELOW MINIMUM REQUIREMENTS, ONE OF TWO THINGS WILL HAPPEN: "1" THE ANTI-LOCK SYSTEM ON THE TAG AXLE WILL SHUT DOWN AND THE CAB MOUNTED FAULT LAMP WILL LIGHT OR "2" THE SYSTEM WILL BECOME INOPERATIVE WITHOUT ACTIVATING THE FAULT LIGHT. THIS FAILS TO CONFORM TO FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 121, "AIR BRAKES".

Remedy

DEALER WILL REPLACE THE INCORRECT ANTI-LOCK MODULE WITHOUT CHARGE TO OWNER.

Notes

VEHICLE DESCRIPTION: TRUCK TRACTORS.SYSTEM: SERVICE BRAKES; VACUUM BRAKE SYSTEM.CONSEQUENCES OF DEFECT: IF THE SYSTEM BECOMES INOPERATIVE, A BRAKE LOCK-UP,LOSS OF VEHICLE CONTROL AND AN ACCIDENT COULD OCCUR WITHOUT PRIOR WARNING.NOTE: THE ELECTRICAL POWER TO THE ANTI-LOCK SYSTEM SHOULD BE DISCONNECTED BYREMOVING THE ANTI-LOCK SYSTEM FUSE UNTIL THE DEFECT CAN BE CORRECTED.