Reported risk: TRUCK AND BUS CHASSIS EQUIPPED WITH DOT 121 AIR BRAKES, TAPERED FRAME RAIL AND REAR AXLE CODES RA-39, RA-189, RA-42, RA-199, RA-44, RA-186, RA-47, RA-57, RA-192. 1975 TRUCK CHASSIS EQUIPPED WITH DOT 121 AIR BRAKES STRAIGHT FRAME RAILS AND REAR AXLE CODES RA-39, AND RA-189. DURING EXTREME UPWARD MOVEMENT OF THE REAR AXLE, A BRAKE HOSE FITTING CONNECTED TO A VALVE LOCATED ON THE TOP FRONT SIDE OF THE REAR AXLE HOUSING CAN CONTACT THE STRUCTURES OR THE COMPONENTS MOUNTED ON THE FRAME. ON SOME VEHICLES THE VALVE CAN CONTACT THE STRUCTURES OR COMPONENTS.
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