i5.  VEHICLE BRAKES UNEVENLY, BRAKES PULL TO ONE SIDE OR GRAB (CONT) TM 9-2320-365-20-2             KNOWN INFO                         TEST OPTIONS                REASON FOR QUESTION     10. Is air present at relay valve delivery port(s) to affected wheel(s)? Replace relay valve (para 11-13). YES 11.            TEST OPTIONS                REASON FOR QUESTION     If air hose(s) to affected brake(s) is damaged or blocked, brakes will not operate at affected wheel(s).             KNOWN INFO                     POSSIBLE PROBLEMS        NO Replace damaged air hose(s) (para 11-19). YES NO 2-1686          Change 1 Air tanks pressurized. Front wheel brake shoes OK. Front wheel brake adjustment OK. Front axle quick release valve OK. Air hose to front brake air chamber OK. Front brake vent hose OK. Front brake air chamber OK. Load sensing valve OK. Rear brake shoes OK. Rear wheel brake adjustment OK.        POSSIBLE PROBLEMS        Faulty relay valve. Faulty air hose to rear brake air chamber. Faulty rear brake vent hose or vent valve. Faulty rear brake air chamber(s). If relay valve does not supply air to all rear brake air chambers, braking will be uneven. Air tanks pressurized. Front wheel brake shoes OK. Front wheel brake adjustment OK. Front axle quick release valve OK. Air hose to front brake air chamber OK. Front brake vent hose OK. Front brake air chamber OK. Load sensing valve OK. Rear brake shoes OK. Rear wheel brake adjustment OK. Relay valve OK. Faulty air hose to rear brake air chamber. Faulty rear brake vent hose or vent valve. Faulty rear brake air chamber(s). Is air present at brake air chamber of affected wheel(s) when brakes are applied? Audible and Visual inspection Audible and Visual inspection