The defect
THE EXISTING INTERLOCK AIR BRAKE SYSTEM MUST GET ITS AIR SUPPLY DIRECTLY FROM THE PARKING BRAKE AIR SUPPLY CIRCUIT. SHOULD A COMPONENT FAILURE OCCUR IN THE INTERLOCK AIR SYSTEM, IT WILL DEPLETE THE AIR SUPPLY FROM THE PARKING BRAKE CIRCUIT.
The risk
DEPLETION OF AIR SUPPLY FROM THE PARKING BRAKE CIRCUITWOULD ALLOW THE BUS TO ROLL WITH THE PARKING BRAKE APPLIED. THIS COULDRESULT IN A VEHICLE ACCIDENT.
The remedy
RELOCATE THE AIR SUPPLY LINE FOR THE INTERLOCK SYSTEM SO THAT THE AIR SUPPLY COMES FROM THE PARKING BRAKE CIRCUIT TO ENSURE THAT WHEN THE PARKING BRAKE IS APPLIED, THE PARKING BRAKE CANNOT BE DISENGAGED OR OVERRIDDEN BY COMPONENT FAILURES.
NHTSA's own wording · initiated by MFR
Vehicles covered
| Model | Model years |
|---|---|
| Volvo B10M | 1984, 1985, 1986 |
Components: SERVICE BRAKES, AIR:ANTILOCK
Model years in this recall
NHTSA complaints and the number of recall campaigns for each model year this recall covers.
| Model | Year | Complaints | Recalls |
|---|---|---|---|
| Volvo B10M | 1984 | 0 | 1 |
| Volvo B10M | 1985 | 0 | 1 |
| Volvo B10M | 1986 | 0 | 1 |
Other service brakes, air recalls in 1991
8 of the 220 recall campaigns reported to NHTSA in 1991 concerned the service brakes, air; VOLVO GM HEAVY TRUCK CORP filed 52 campaigns in all.
| 91V218000 16 Dec 1991 | BLUE BIRD BODY COMPANY |
| 91V197000 12 Nov 1991 | VOLVO GM HEAVY TRUCK CORP |
| 91V194000 4 Nov 1991 | OSHKOSH TRUCK CORPORATION |
| 91V178000 15 Oct 1991 | FREIGHTLINER CORPORATION |
| 91V171000 4 Oct 1991 | EOS COACH |
| 91V125000 24 Jul 1991 | LABRIE EQUIPMENT LTD. |
| 91V043000 14 Mar 1991 | PACCAR, INCORPORATED |
NHTSA recalls (public domain) · all recalls of 1991