NHTSA Campaign Id 89V178000; Date: Oct. 23, 1989
The snap ring can come out causing the valve tomalfunction and apply the truck's brake system without warning; this couldresult in loss of control and a crash.
1989 Mack CH
Component: Service Brakes, Air:controls:foot Control
Manufactured by: Mack Trucks, Incorporated
Affected Units:: 3,652
Internal components of the e-12 dual circuit air brake valves may be misassembled so that one of the tapered snap rings is upside down.
Replace misassembled valves.
System: air brake valves. Vehicle description: trucks
Date Owners notified by Manufacturer: Nov 10, 1989
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