MACK: DM: SERVICE BRAKES, AIR:SUPPLY:HOSES, LINES/PIPING, AND FITTINGS
| NHTSA Campaign Number: | 75V192000 |
| Vehicle/Equipment Make: | MACK TRUCKS, INCORPORATED |
| Vehicle/Equipment Model: | DM |
| Model Year: | 1974 |
| Manufacturer Component Description: | SERVICE BRAKES, AIR:SUPPLY:HOSES, LINES/PIPING, AND FITTINGS |
| Manufacturers Involved in Recall: | MACK TRUCKS, INC |
| Type of Report: | V (Vehicle, Equipment or Tire) |
| Potential Number of Units Affected: | 1200 |
| Date Owner Notified By Manufacturer: | 19760220 |
| Recall Initiated By: | MFR |
| Manufacturer Responsible For Recall: | MACK TRUCKS, INCORPORATED |
| Report Received Date: | 19751031 |
| Record Creation Date: | 19791012 |
Notes:
MACK CAMPAIGN NO N/A.TRUCKS WITH DUAL BRAKE TREADLE VALVE PIPING SEPT.1974AND MAR.31, 1975.POSSIBILITY THAT THE PRIMARY AND SECONDARY AIR SUPPLYLINES MAY HAVE BEEN CONNECTED IN REVERSE AT THE DUAL BRAKE TREADLE VALVE.THEREVERSING OF THESE SUPPLY LINES DOES NOT IN ITSELF, AFFECT VEHICLE BRAKING IFBOTH THE PRIMARY AND SECONDARY AIR SUPPLY SYSTEMS HAVE NORMAL OPERATING AIRPRESSURE.HOWEVER, IN THE EVENT OF LOSS OF AIR PRESSURE IN EITHER THE PRIMARYOR SECONDARY SYSTEM, NEITHER THE PRIMARY NOR SECONDARY SERVICE BRAKES WOULDFUNCTION WHEN APPLIED.IN THIS EVENT, IT WOULD REQUIRE MANUAL APPLICATION OFTHE EMERGENCY SPRING BRAKE TO STOP VEHICLE.(CORRECT BY INSPECTING ANDREROUTING AIR SUPPLY PIPING AS REQUIRED TO CORRECT SYSTEM).