TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
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TM 9-2320-361-24-1 0010 00 0010 00-4 COMPRESSED AIR AND BRAKE SYSTEM TROUBLESHOOTING (Contd) Table 2. Service Brakes Troubleshooting Procedures. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. BRAKE PEDAL LOW, SOFT, OR GOES TO FLOORBOARD (WEAK OR NO BRAKING) WARNING Ensure new, longer front brake hoses, currently used on 5 ton trucks, are installed on all 2-1/2 ton trucks. Old, shorter front brake hoses are subject to failure during full steering travel and must be replaced with new, longer front brake hoses. Failure to do this may result in injury or death to personnel. NOTE Old, shorter front brake hoses should be replaced with new longer front brake hoses (WP 0176 00). 1. Check master cylinder fluid level. 2. Check wheel cylinders (2), hydraulic brake lines (1), and hoses for leaks, cracks, breaks, or loose connections. 3. Check for air in service brake system. 4. Check service brake hydraulic fluid for contamination. 5. Check service brakeshoes (3) for proper adjustment and check service brakeshoe (3) linings for wear. 6. Remove two screws (6) and shield (7) from air-hydraulic cylinder (4). Inspect master cylinder (5) for leaks. 7. Inspect air-hydraulic cylinder (4) for brake fluid leaks. 8. Perform master cylinder (5) internal leakage test (WP 0170 00). If fluid level is low, fill to proper level (WP 0020 00). 1. If hydraulic brake lines (1) or hoses are loose, tighten. 2. If hydraulic brake lines (1) or hoses are broken, cracked, or leaking, replace (WP 0175 00, WP 0176 00, or TM 9-243). 3. If wheel cylinders (2) are leaking, replace (WP 0169 00). Bleed service brake system (WP 0172 00). If fluid is contaminated, flush entire brake system (WP 0172 00). 1. Adjust service brakeshoes (3) if necessary (WP 0168 00). 2. If service brakeshoe (3) linings are worn more than 0.328 in. (8.33 mm), replace (WP 0167 00). If master cylinder (5) is leaking, replace (WP 0170 00). If air-hydraulic cylinder (4) is leaking brake fluid, replace (WP 0171 00). 1. If master cylinder (5) is leaking internally, replace (WP 0170 00). 2. If master cylinder (5) is good and malfunction still exists, replace air-hydraulic cylinder (4) (WP 0171 00).