VEHICLE DESCRIPTION: CLASS 8 HEAVY DUTY TRUCKS. THE AIR SUSPENSION CONTROL VALVE SUPPLY LINE WAS NOT PLUMBED THROUGH AN AIR PRESSURE PROTECTION VALVE. IN THE EVENT OF A FAILURE, THERE WOULD BE LOSS OF AIR PRESSURE IN THE 'B' SYSTEM AIR RESERVOIR THAT SUPPLIES AIR PRESSURE FOR THE FRONT STEER AXLE BRAKES.
Consequence & remedy
Consequence: THIS CONDITION WOULD RESULT IN INCREASED STOPPING DISTANCES.
Remedy: DEALERS WILL INSTALL THE NECESSARY AIR PRESSURE PROTECTION VALVE.
Consequence: IF SUCH CONTACT OCCURS WHEN HEATER FAN IS ON MEDIUMSPEED, AN ELECTRICAL SHORT OCCURS, CAUSING THE FAN SPEED CONTROL RESISTOR TOOVERHEAT AND MELT THE PLASTIC FAN HOUSING; THIS WOULD CREATE A POTENTIAL FORA FIRE.
Remedy: REPOSITION AIR RIDE SUSPENSION VALVE TO PREVENT ITS CONTACT WITH THE HEATER FAN CONTROL SWITCH.
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