MC5B: SERVICE BRAKES, AIR:SUPPLY

Go Back To 1978 MOTOR COACH INDUSTRIES, INC Directory

NHTSA Campaign Number:	77V186000
Vehicle/Equipment Make:	MOTOR COACH
Vehicle/Equipment Model:	MC5B
Model Year:	1978
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.

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