TM 9-2320-289-20
Table 2-3. Mechanical Troubleshooting (Con’t)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 6.
Inspect brake shoes and brake pads for incorrect installation, distortion, and
excessive wear; thickness of lining or distance from rivet head must exceed
0.031 in. (0.80 mm).
Repair if required. (See paragraphs 7-7 and 7-11)
Step 7.
Have assistant press brake pedal; check for movement of caliper piston.
Replace calipers if required. (See paragraph 7-11)
Step 8.
Inspect for binding brake pedal mechanism.
Lubricate or replace bushing and spacer. (See paragraph 7-12)
8.
PEDAL RETURNS SLOWLY
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.
Inspect power steering pump belt.
Tighten if loose or replace if worn. (See paragraph 8-15)
WARNING
Compressed air used to check for restrictions should never exceed 30 psi
(207 kPa). Use only effective chip guarding and personnel protective
equipment (goggles/shield, gloves, etc.). Failure to follow this warning may
result in serious injury to personnel.
Step 2.
Check for restrictions in lines from power booster to power steering pump with low
pressure air.
Clear restrictions or replace. (See paragraph 8-14)
Step 3.
Check power booster input rod end at brake pedal for wear or damage.
Replace if worn or damaged. (See paragraph 7-8)
9.
EXCESSIVE PEDAL TRAVEL
Step 1.
Check master cylinder reservoirs for low brake fluid. (See LO 9-2320-289-12)
Step 2.
Inspect master cylinder and brake lines for leakage.
Tighten or replace damaged parts. (See paragraphs 7-8, 7-9, and 7-10)
Fill reservoir if low. (See LO 9-2320-289-12)
Change 2
2-37
