NHTSA Recall 81V088000
NHTSA Campaign Id 81V088000; Date: Jul. 8, 1981
Recalled Vehicles:
1979 Mack F Series; 1980 Mack F Series; 1979 Mack Mc Series; 1980 Mack Mc Series; 1979 Mack R Series; 1980 Mack R Series; 1979 Mack U Series; 1980 Mack U Series
Component: Service Brakes, Air:controls:hand Control
Manufactured by: Mack Trucks, Incorporated
Affected Units:: 10,000
Recall Summary:
The retaining pin for the brake control knob has been misaligned (off the center line of the valve plunger hole). This causes the knob to be overstressed at the retaining pin hole area causing it to separate from the valve.
How to Fix:
The holes will be retooled to provide correct alignment and plastic knobs will be replaced by knobs of stronger material having metal reinforcements.
Recall Notes:
Vehicle description: trucks equipped with brake control knobs. System: service brakes; knob retaining pin. Consequences of defect: with the knob broken off, the control valve wouldbecome difficult or impossible to operate. One or a combination of brakeapplications would not be possible and the vehicle could be parked in an unsafecondition. An accident and personal injury could result.
Date Owners notified by Manufacturer: Dec 21, 1981
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