The defect
THE PARKING BRAKE VALVES MAY HAVE BEEN INCORRECTLY PIPED. IF THE PARKING BRAKE PIPING IS INCORRECTLY ROUTED, THERE IS NO WAY TO SET THE TRACTOR PARKING BRAKES INDEPENDENTLY OF THE TRAILER PARKING BRAKES. THIS COULD CAUSE THE PARKING BRAKES TO BACK OFF WHILE THE TRAILER AIR SUPPLY IS BEING CHARGED, CAUSING THE TRACTOR TO ROLL.
The remedy
TRAILER AIR SUPPLY WILL BE MOVED FROM THE DISCHARGE SIDE OF THE TRACTOR PARKING VALVE TO THE DISCHARGE SIDE OF THE COMBINATION PARKING VALVE. THIS SERVICE WILL BE DONE AT NO CHARGE.
NHTSA's own wording · initiated by MFR
Vehicles covered
| Model | Model years |
|---|
Components: PARKING BRAKE:DRIVELINE:AIR
Other parking brake recalls in 1979
4 of the 274 recall campaigns reported to NHTSA in 1979 concerned the parking brake; PACCAR, INCORPORATED filed 199 campaigns in all.
| 79V182000 3 Aug 1979 | GRUMMAN FLXIBLE CORP. |
| 79V069000 13 Mar 1979 | GENERAL MOTORS CORP. |
| 79V064000 2 Mar 1979 | MAGIRUS DEUTZ A.G., WEST |
NHTSA recalls (public domain) · all recalls of 1979