| NHTSA Campaign Number: |
77V186000 |
| Vehicle/Equipment Make: |
MOTOR COACH |
| Vehicle/Equipment Model: |
MC5B |
| Model Year: |
1977 |
| Manufacturer Campaign Number: |
|
| Manufacturer Component Description: |
SERVICE BRAKES, AIR:SUPPLY |
| Manufacturers Involved in Recall: |
MOTOR COACH IND., INC. |
| Manufacturered: |
- |
| Type of Report: |
V (Vehicle, Equipment or Tire) |
| Potential Number of Units Affected: |
1182 |
| Date Owner Notified By Manufacturer: |
19771005 |
| Recall Initiated By: |
19771005 |
| Manufacturer Responsible For Recall: |
MOTOR COACH INDUSTRIES, INC |
| Report Received Date: |
19771025 |
| Record Creation Date: |
19791012 |
| Regulation Part Number: |
571 |
| Federal Motor Vehicle Safety Standard Number: |
121 |
| Defect Summary: |
THE INVOLVED VEHICLES DO NOT CONFORM TO FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 121, "AIR BRAKE SYSTEMS". THE TWO "O" RINGS THAT ARE SUPPLIED ALONG WITH THE NEW SHUTTLE VALVES ARE OF A BUNA "V" QUALITY. THESE RINGS ARE FULLY FUNCTIONAL IN NORMAL CLIMATE CONDITIONS, HOWEVER, IN EXTREMELY COLD ENVIRONMENTS, SLIGHT LEAKS MAY DEVELOP. THIS VALVE ACTS AS A SEAL BETWEEN THE CYLINDER HEADS OF THE SHUTTLE VALVE AND THE PISTON. IN TIME THIS SEAL MAY EXPAND OR "PUCKER UP", MAKING IT POSSIBLE FOR THE SHUTTLE TO BECOME TRAPPED IN AN EMERGENCY BRAKING SITUATION. |
| Consequence Summary: |
|
| Corrective Summary: |
THE DEALER WILL REPLACE ALL DEFECTIVE "O" RINGS WITH ONES HAVING EXTREME COLD RESISTANCE PROPERTIES. |