1978 MACK MB Recalls (3)
- Campaign:
- 78V210000 on 10/11/1979
- Component:
- Service brakes, air:antilock:interconnecting assembly(wiring)
- Manufactured:
- 09/30/1977 - 08/31/1978
- Affected:
- 19,370
- Defect:
- Delays of up to about 2 seconds may exist in the brake application times to the brakes on the bogie axles in the presence of certain types of wheel speed sensor signal discontinuities or distortions that may occur as a result of sensor wire failure. this constitutes a non-compliance to federal motor vehicle safety standard no. 121, "air brake systems".
- Correction:
- Dealer will install new wheel speed sensors that incorporate improved wiring and the present bogie anti-wheel lock system will be changed to an axle-to-axle system for improved reliability.
- Notes:
- Vehicle description: heavy trucks.system: service brakes; electrical wiring and connectors.consequences of defect: this delay in effective braking action could lead to anaccident under certain traffic conditions.
- Campaign:
- 78V172000 on 10/11/1979
- Component:
- Steering:linkages:knuckle:spindle:arm
- Affected:
- 13,800
- Defect:
- The existing cross steering arms may have insufficient fatigue life in the neck area. this is near the boss for the cross steering tube ball joint connection. failure of either of the cross steering levers could lead to loss of steering control of the right front wheel.
- Correction:
- The dealer will inspect and, if necessary, install cross steering arms of improved design and greater strength.
- Notes:
- Vehicle description: truck tractors.system: steering; steering arm.consequences of defect: loss of steering control could lead to loss of vehiclecontrol and an accident.
- Campaign:
- 79V018000 on 10/11/1979
- Component:
- Suspension:rear:springs:leaf spring assembly:hanger/bracket
- Manufactured:
- 03/31/1978 - 05/31/1978
- Affected:
- 17
- Defect:
- The steel brackets on the suspension beam were found to be deficient due to excessive shrinkage and low mechanical properties. failure of one or both of these brackets could cause a separation of the axle housing from the suspension.
- Correction:
- The dealer will inspect and, if necessary, replace any suspect bogie spring insulator caps with new caps meeting the proper specifications at no cost to owner.
- Notes:
- Vehicle description: trucks, heavy.system: suspension; hanger brackets.consequences of defect: loss of vehicle control can result and lead to avehicle accident.
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