TM-9-2320-272-23-1

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

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5

SEPTEMBER 2012

TM-9-2320-272-23-1 - Page 1054 of 1313

FIELD MAINTENANCE

VEHICLE REAR BRAKES GRAB OR DRAG

INITIAL SETUP:

Tools and Special Tools

Tool Kit, General Mechanic's: Automotive

(Volume 5, WP

0826, Table 1, Item 56)

Gauge, Pressure

(Volume 5, WP

0826, Table 1, Item 19)

Test Set, Electronic Systems

(Volume 5, WP

0826, Table 1, Item 51)

Personnel Required

(2)

References

Point to Point Schematics

References (cont.)

WP

0120

Volume 3, WP

0424

Volume 3, WP

0426

Volume 3, WP

0432

Volume 3, WP

0434

Volume 3, WP

0480

Volume 3, WP

0482

Volume 5, WP

0805

Equipment Condition

Vehicle parked and engine shut down.

(TM

9-2320-272-10)

TROUBLESHOOTING PROCEDURE

VEHICLE REAR BRAKES GRAB OR DRAG

NOTE

Conduct these malfunction tests if vehicle rear brakes grab or drag. This procedure will check

for brake mechanism damage or malfunctions, brake system air leaks and proper pressure

supply to rear brake chambers.

TM 9-2320-272-23-1

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0122-1