TM 9-2320-289-20
Table 2-3. Mechanical Troubleshooting (Con’t)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 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 exhaust
accumulator 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 BRAKES
NOTE
Pedal should travel 1-1½ in. (2.54-3.81 cm) before brakes take hold. After
brakes take hold, pedal may exceed 1-1½ in. (2.54-3.81 cm) travel; this is
normal.
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 power
steering pump and lines for leakage.
Tighten hoses if leaking. If still leaking, replace pump and/or hoses. (See
paragraphs 8-15 and 8-14)
Fill reservoir if low. (See LO 9-2320-289-12)
12. ROUGHNESS FELT DURING NORMAL BRAKE APPLICATION
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.
Inspect brake shoes and brake pads for incorrect installation, foreign material,
distortion, and excessive wear; thickness of lining or distance from rivet head must
exceed 0.031 in. (0.80 mm).
Repair or replace if necessary. (See paragraphs 7-7 and 7-11)
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