TM 9-2320-289-20Table 2-3. Mechanical Troubleshooting (Con’t)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONStep 3.Check rear brake adjustment and inspect auto adjusters for damage,Adjust rear brakes and repair auto adjusters if damaged. (See paragraph 7-7)Step 4.Check power booster operation. Depress brake pedal several times to exhaustaccumulator pressure. Start engine. Brake pedal should return to normal position.Replace power booster if not operating properly. (See paragraph 7-8)Step 5.Check wheel bearing adjustment. (See paragraphs 8-4 and 8-5)10. SPONGY BRAKESNOTEPedal should travel 1-1½ in. (2.54-3.81 cm) before brakes take hold. Afterbrakes take hold, pedal may exceed 1-1½ in. (2.54-3.81 cm) travel; this isnormal.Step 1.Bleed brakes. (See paragraph 7-6)11. PEDAL VIBRATES (BOOSTER CHATTERS)Step 1.Inspect power steering pump belt.Tighten if loose or replace if worn. (See paragraph 8-15)Step 2.Check power steering pump reservoir for low power steering fluid. Inspect powersteering pump and lines for leakage.Tighten hoses if leaking. If still leaking, replace pump and/or hoses. (Seeparagraphs 8-15 and 8-14)Fill reservoir if low. (See LO 9-2320-289-12)12. ROUGHNESS FELT DURING NORMAL BRAKE APPLICATIONWARNINGDO NOT use a dry brush or compressed air to clean brake shoes, brakepads, or brake components. There may be asbestos dust on brake shoes,brake pads, or brake components which can be dangerous to you if youbreathe 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 inserious illness or death to personnel.Step 1.Inspect brake shoes and brake pads for incorrect installation, foreign material,distortion, and excessive wear; thickness of lining or distance from rivet head mustexceed 0.031 in. (0.80 mm).Repair or replace if necessary. (See paragraphs 7-7 and 7-11)2-38Change 2
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