Service brakes, air › Controls › Foot control/valve
Reported Oct 20, 19894,054 vehicles affectedALLIED AUTOMOTIVEBuilt Nov 1, 1988 – Sep 1, 1989
The risk
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.
System: air brake valves.vehicle description: replacement parts for mack trucks.description of defects: internal components of the E-12 dual circuit air brakevalves may be misassembled so that one of the tapered snap rings IS upside down.