Table 2. Service Brakes Troubleshooting Procedures

TM 9-2320-361-24-1

0010 00

COMPRESSED AIR AND BRAKE SYSTEM TROUBLESHOOTING (Contd)

Table 2. Service Brakes Troubleshooting Procedures.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. BRAKE PEDAL LOW,

WARNING

SOFT, OR GOES TO

Ensure new, longer front brake hoses,

FLOORBOARD

currently used on 5 ton trucks, are

(WEAK OR

installed on all 2-1/2 ton trucks. Old,

NO BRAKING)

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.

If fluid level is low, fill to proper level

(WP 0020 00).

2. Check wheel cylinders (2),

1. If hydraulic brake lines (1) or hoses

hydraulic brake lines (1), and hoses

are loose, tighten.

for leaks, cracks, breaks, or loose

2. If hydraulic brake lines (1) or hoses

connections.

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

3. Check for air in service brake

(WP 0172 00).

system.

4. Check service brake hydraulic fluid If fluid is contaminated, flush entire

brake system (WP 0172 00).

for contamination.

1. Adjust service brakeshoes (3) if

5. Check service brakeshoes (3) for

necessary (WP 0168 00).

proper adjustment and check

service brakeshoe (3) linings for

2. If service brakeshoe (3) linings are

wear.

worn more than 0.328 in.

(8.33 mm), replace (WP 0167 00).

If master cylinder (5) is leaking,

6. Remove two screws (6) and shield

replace (WP 0170 00).

(7) from air-hydraulic cylinder (4).

Inspect master cylinder (5) for

leaks.

If air-hydraulic cylinder (4) is leaking

7. Inspect air-hydraulic cylinder (4)

brake fluid, replace (WP 0171 00).

for brake fluid leaks.

1. If master cylinder (5) is leaking

8. Perform master cylinder (5)

internally, replace (WP 0170 00).

internal leakage test (WP 0170 00).

2. If master cylinder (5) is good and

malfunction still exists, replace

air-hydraulic cylinder (4)

(WP 0171 00).

0010 00-4