Mack Mb 1977

Model Mb made in 1977 by Mack got 4 recalls. There were some recalls concerningservice brakes, air, steering and suspension.

Mb year 1977

Recalls

Model 1977

Recalls

Campaign	Manufacturer	Manufacturing date	Type	# of units affected	Date Owner notified Mfg	Recall Initiated by	Manufacturers of recalled vehicles/products	Report Recieved Date	Record Creation Date	Regulation Part Number	FMVSS Number
SERVICE BRAKES, AIR - ANTILOCK - INTERCONNECTING ASSEMBLY(WIRING)
78V210000	MACK TRUCKS, INCORPORATED	from 10/01/1977 to 09/01/1978	V (Vehicle)	19370	11/07/1978	MFR	MACK TRUCKS, INC	10/03/1978	10/12/1979	571	121
Defect Summary	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.
Consequence Summary
Corrective Summary	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.
STEERING - LINKAGES - KNUCKLE - SPINDLE - ARM
78V172000	MACK TRUCKS, INCORPORATED		V (Vehicle)	13800	02/22/1979	MFR	MACK TRUCKS, INC	08/08/1978	10/12/1979
Defect Summary	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.
Consequence Summary
Corrective Summary	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.
SUSPENSION - REAR - SPRINGS - LEAF SPRING ASSEMBLY - HANGER/BRACKET
77V205000	MACK TRUCKS, INCORPORATED	from 05/01/1977 to 10/01/1977	V (Vehicle)	7400	03/14/1978	MFR	MACK TRUCKS, INC	11/21/1977	10/12/1979
Defect Summary	A deficiency exists in the welds securing the rear spring insulator bracket to the axle housing. this is due to improper positioning of the weld, in relationship to the bracket and axle housing. failure of the welds would cause separation of the spring insulator bracket and the axle housing, resulting in improper alignment of the affected axle.
Consequence Summary
Corrective Summary	Dealer will reweld the insulator spring bracket at no cost to owner.
Notes	Vehicle description: heavy trucks.system: suspension; tandem axle.consequences of defect: this condition could cause a loss of vehicle controland a vehicle accident.
WHEELS
77V096000	MACK TRUCKS, INCORPORATED		V (Vehicle)	825	09/09/1977	MFR	MACK TRUCKS, INC	06/17/1977	10/12/1979
Defect Summary	The front wheel rim clamp studs, installed on the involved vehicles, may not have been manufactured correctly, causing a brittle condition in the thread root area. the studs could eventually crack and break when wheel nuts are tightened to specifications.
Consequence Summary
Corrective Summary	The dealer will replace all suspect front wheel studs, without charge to owner.
Notes	Vehicle description: heavy trucks.system: wheels; studs.consequences of defect: wheel stud failure could cause a loosened tire assemblyand impaired vehicle control. failure of more than one stud could causeseparation of the tire and rim assembly, causing loss of vehicle control and anaccident.note: driver may be alerted to the condition by a wobble or vibration in theaffected wheel.