TM-9-2320-273-10

TRUCK, TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER

TECHNICAL MANUAL; OPERATOR’S MANUAL

DECEMBER 2012

TM-9-2320-273-10 - Page 261 of 452

OPERATOR MAINTENANCE

OPERATION UNDER UNUSUAL CONDITIONS

SPRING BRAKE POWER SPRING OPERATION

INITIAL SETUP:

Tools and Special Tools

Adjustable wrench, 12 in.

(WP 0037, Table 5, Item 7)

Equipment Condition

Wheels chocked (WP 0012).

WARNING

Chock wheels to keep vehicle from moving before brakes

are released. Failure to comply may result in serious injury

or death to personnel. Seek medical attention in the event of

an injury.

GENERAL

NOTE

M915A1 vehicles equipped with anti-lock brake system

(ABS) have spring brake chambers added to rear-rear axle

brakes.

In the event of an air system pressure loss, the spring brake chambers on the

forward-rear axle will apply the forward-rear axle brakes on the M915A1. On M915

through M920 vehicles, the spring brake chambers on the forward-rear axle and

rear-rear axle will apply the forward-rear axle and rear-rear axle brakes. If the vehicle

must be moved and there is not enough air system pressure to compress the power

spring in the spring brake chambers and release the brakes, you must do this manually.

TM 9-2320-273-10

0020

0020-1