The issue
THE PRIMARY AND SECONDARY AIR SUPPLY LINES MAY HAVE BEEN CONNECTED IN REVERSE AT THE DUAL BRAKE TREADLE VALVE.
Transport Canada Vehicle Recalls Database · Contains information licensed under the Open Government Licence – Canada · official text, unchanged
Vehicles covered
| Make and model | Model years |
|---|---|
| Mack DM | 1974, 1975 |
| Mack DMM | 1964, 1965 |
| Mack F | 1974, 1975 |
| Mack MB | 1974, 1975 |
| Mack R | 1974, 1975 |
| Mack RD | 1974, 1975 |
| Mack RM | 1974, 1975 |
| Mack U | 1974, 1975 |