i5.  VEHICLE BRAKES UNEVENLY, BRAKES PULL TO ONE SIDE OR GRAB (CONT) 2-1678          Change 1 WARNING Read WARNING on following page. 2. Are front wheel brake shoes free from contamination, oil, and grease?            TEST OPTIONS            Visual inspection     REASON FOR QUESTION     Brakes will slip or bind if brake shoes are contaminated.             KNOWN INFO              Air tanks pressurized.        POSSIBLE PROBLEMS        Contaminated front wheel brake shoes. Faulty front wheel brake adjustment. Faulty front axle quick release valve. Faulty air hose to front brake air chamber. Faulty front brake vent hose. Faulty front brake air chamber. Faulty load sensing valve. Contaminated rear brake shoes. Faulty rear wheel brake adjustment. 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). NO Clean brake shoes (para 2-37) and replace wheel bearing seals (para 10-2). YES 3. Do brakes at one front wheel fail to apply?             KNOWN INFO              Air tanks pressurized. Front wheel brake shoes OK.        POSSIBLE PROBLEMS        Faulty front wheel brake adjustment. Faulty front axle quick release valve. Faulty air hose to front brake air chamber. Faulty front brake vent hose. Faulty front brake air chamber. Faulty load sensing valve. Contaminated rear brake shoes. Faulty rear wheel brake adjustment. 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).            TEST OPTIONS            Visual inspection     REASON FOR QUESTION     If one front wheel brake does not apply, vehicle will pull to other side when brakes are applied. NO Perform brake shoe clearance adjustment (para 11-2). YES TM 9-2320-365-20-2