TM-9-2320-361-24-1
2-1/2 TON, 6X6, M44A2 SERIES TRUCKS
TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE PART 1 OF 2
AUGUST 2006
TM-9-2320-361-24-1 - Page 164 of 1176
TM 9-2320-361-24-1
0010 00
0010 00-4
COMPRESSED AIR AND BRAKE SYSTEM TROUBLESHOOTING (Contd)
Table 2. Service Brakes Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. BRAKE PEDAL LOW,
SOFT, OR GOES TO
FLOORBOARD
(WEAK OR
NO BRAKING)
WARNING
Ensure new, longer front brake hoses,
currently used on 5 ton trucks, are
installed on all 2-1/2 ton trucks. Old,
shorter front brake hoses are subject
to failure during full steering travel
and must be replaced with new,
longer front brake hoses. Failure to do
this may result in injury or death to
personnel.
NOTE
Old, shorter front brake hoses should
be replaced with new longer front
brake hoses (WP 0176 00).
1. Check master cylinder fluid level.
2. Check wheel cylinders (2),
hydraulic brake lines (1), and hoses
for leaks, cracks, breaks, or loose
connections.
3. Check for air in service brake
system.
4. Check service brake hydraulic fluid
for contamination.
5. Check service brakeshoes (3) for
proper adjustment and check
service brakeshoe (3) linings for
wear.
6. Remove two screws (6) and shield
(7) from air-hydraulic cylinder (4).
Inspect master cylinder (5) for
leaks.
7. Inspect air-hydraulic cylinder (4)
for brake fluid leaks.
8. Perform master cylinder (5)
internal leakage test (WP 0170 00).
If fluid level is low, fill to proper level
(WP 0020 00).
1. If hydraulic brake lines (1) or hoses
are loose, tighten.
2. If hydraulic brake lines (1) or hoses
are broken, cracked, or leaking,
replace (WP 0175 00, WP 0176 00,
or TM 9-243).
3. If wheel cylinders (2) are leaking,
replace (WP 0169 00).
Bleed service brake system
(WP 0172 00).
If fluid is contaminated, flush entire
brake system (WP 0172 00).
1. Adjust service brakeshoes (3) if
necessary (WP 0168 00).
2. If service brakeshoe (3) linings are
worn more than 0.328 in.
(8.33 mm), replace (WP 0167 00).
If master cylinder (5) is leaking,
replace (WP 0170 00).
If air-hydraulic cylinder (4) is leaking
brake fluid, replace (WP 0171 00).
1. If master cylinder (5) is leaking
internally, replace (WP 0170 00).
2. If master cylinder (5) is good and
malfunction still exists, replace
air-hydraulic cylinder (4)
(WP 0171 00).
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