15. PEDAL PULSATES

TM 9-2320-289-34 Table 2-1. Mechanical Troubleshooting (Con’t) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 14. PEDAL RETURNS SLOWLY Step 1, Repair power booster. (See paragraph 7-3) 15. PEDAL PULSATES WARNING DO NOT use a dry brush or compressed air to clean brake shoes, brake pads, or brake components. There may be asbestos dust on brake shoes, brake pads, or brake components which can be dangerous to you if you breathe it. Brake shoes, brake pads, and brake components must be wet, and a soft brush must be used. Failure to follow this warning may result in serious illness or death to personnel, Step 1. Remove calipers. (See TM 9-2320-289-20) Install dial indicator so that plunger contacts rotor about 1 in. (25 mm) from outside edge of rotor. Turn rotor one complete rotation, Variation in dial indicator readings (lateral runout) should not be more than 0.004 in, (0, 102 mm). Repeat for other rotor, If lateral runout is excessive, adjust wheel bearings (See TM 9-2320-289-20) and retest. If lateral runout is still excessive, machine rotor. (See paragraph 7-2) Step 2. Remove drums. (See TM 9-2320-289-20) Measure inside diameter of drums at open and closed edges and at right angles to each other, Do this at 8 evenly-spaced points. If there is a difference between measurements (out-of-round), machine drums to specifications. (See paragraph 7-2) Step 3. Inspect rotors and drums for heat spotting or scoring. Machine to specifications if heat spotted or scored. (See paragraph 7-2) Step 4. Adjust wheel bearings. (See TM 9-2320-289-20) Step 5. Check tires for improper balancing. (See TM 9-261 0-200-24) Step 6. Check components of suspension system for looseness or damage. Tighten any loose components. Replace any damaged components. 2-15