NHTSA Recall 78V210000
NHTSA Campaign Id 78V210000; Date: Oct. 3, 1978
Recalled Vehicles:
1977 Mack DM; 1978 Mack DM; 1977 Mack DMM; 1978 Mack DMM; 1977 Mack F; 1978 Mack F; 1977 Mack MB; 1978 Mack MB; 1977 Mack R; 1978 Mack R; 1977 Mack RD; 1978 Mack RD; 1977 Mack RL; 1978 Mack RL; 1977 Mack RM; 1978 Mack RM; 1977 Mack RS; 1978 Mack RS; 1977 Mack RWL; 1978 Mack RWL; 1977 Mack RWS; 1978 Mack RWS; 1977 Mack U; 1978 Mack U; 1977 Mack WL; 1978 Mack WL; 1977 Mack WS; 1978 Mack WS
Component: Service Brakes, Air:antilock:interconnecting Assembly(wiring)
Manufactured by: Mack Trucks, Incorporated
Affected Units:: 19,370
Recall 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".
How to Fix:
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.
Recall 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.
Date Owners notified by Manufacturer: Nov 7, 1978
Also see: