TM-9-2320-272-24-1

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4

JUNE 1998

TM-9-2320-272-24-1 - Page 862 of 1015

TM 9-2320-272-24-1

3-179. BRAKE MECHANISM CHECKS AND ADJUSTMENTS (FRONT AND REAR)

THIS TASK COVERS:

a. Brakeshoe Check and Adjustment

b. Checking Brakeshoe Wear

c. Mechanism Inspection

INITIAL SETUP:

APPLICABLE MODELS

REFERENCES (TM)

All

TM 9-2320-272-10

SPECIAL TOOLS

TM 9-2320-272-24P

Brakeshoe adjusting tool (Appendix E, Item 21)

EQUIPMENT CONDITION

TOOLS

Parking brake set (TM 9-2320-272-10).

General mechanic’s tool kit (Appendix E, Item 1)

Spring (emergency) brake caged (TM 9-2320-272-10)

Front hub and drum removed (task c. only)

PERSONNEL REQUIRED

(para. 3-223 or 3-460).

Rear hub and drum removed (task c. only)

TWO

(para. 3-224 or 3-461).

1.

Remove two rubber inspection hole covers (1) from brakedrum dustcovers (4).

2.

Check brakeshoe lining (7) to brakedrum (6) clearance through inspection hole (5). Clearance should

be 0.020-0.040 in. (0.508-1.016 mm).

3.

Remove two rubber adjusting hole covers (2) from brakedrum dustcovers (4).

4.

Using brakeshoe adjusting tool through adjusting holes (3), rotate star wheel (8) until proper

clearance is obtained.

5.

Install two rubber inspection hole covers (1) and two rubber adjusting hole covers (2) on brakedrum

dustcovers (4).

3-498