TM 9-2320-289-20
Table 2-3. Mechanical Troubleshooting (Con’t)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4.
GRABBING OR UNEVEN BRAKING ACTION BETWEEN FRONT AND REAR BRAKES
Step 1.
Inspect combination valve and lines for obvious damage.
Replace valve and lines if damaged. (See paragraph 7-9)
Step 2.
Inspect proportioning valve (all except M1009) and lines for obvious damage.
Replace proportioning valve and lines if damaged. (See paragraph 7-10)
If proportioning valve is not damaged, adjust. (See paragraph 7-10)
5.
HIGH-PITCHED SQUEAK
Step 1.
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 necessary. (See paragraphs 7-7 and 7-11)
6.
PARKING BRAKE DOES NOT HOLD TRUCK
Step 1.
Check parking brake adjustment
Adjust parking brake (see
paragraphs 7-3 and 7-4).
7.
PEDAL EFFORT EXCESSIVE
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Check for insufficient brake fluid
and ensure that linkage operates properly.
paragraph 7-2) or replace damaged parts
in master cylinder.
(see
Fill reservoir if low (see LO 9-2320-289-12) and check for leakage.
Check power steering pump fluid level. (See LO 9-2320-289-12)
Check to ensure that the correct power booster has been installed (all except
M1009). (See paragraph 7-8)
If condition still exists replace power booster. (See paragraph 7-8)
Inspect power steering belt.
Tighten if loose or replace if worn. (See paragraph 8-15)
Inspect brake lines and hoses. (See TB 9-2300-405-14)
Clear restrictions or replace if damaged or crimped. (See paragraphs 7-9
and 7-10)
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