United States 88V171000
E-One Incorporated
The problem
USE OF THE AIR HORN CAN CAUSE THE AIR PRESSURE TO DROP BELOW 85 PSI.
Risk
IF AIR PRESSURE DROPS BELOW 85 PSI WHILE THE VEHICLE ISBEING DRIVEN THE REAR BRAKE SPRING CHAMBERS WILL START TO APPLY CAUSING THEREAR BRAKE DRUMS TO OVERHEAT.
What owners should do
INSTALL PRESSURE PROTECTION VALVES IN ALL AIR HORN CIRCUITS.
Units 71