TM-9-2320-387-24-1

TRUCK, UTILITY: S250 SHELTER CARRIER, 4X4, M1113

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

DECEMBER 1997

CHANGE 1

TM-9-2320-387-24-1 - Page 480 of 1205

REFERENCE INFORMATION

Test for faulty proportioning

valve:

Drive the vehicle and have an assistant

observe during the performance

of this test.

With vehicle at curb weight, decelerate

vehicle from 45 to 40 mph (72 to 69 kph)

on dry concrete road and apply sufficient

pressure to lock up front brakes.

If rear

brakes lock up before front brakes,

the proportioning

valve should be replaced.

Replace proportioning

valve (para. 7-10).

Method for checking hydra-booster:

Depress brake pedal several times to

exhaust accumulator

pedal.

Depress

brake pedal and start engine.

Brake

pedal should fall, then push back

against operatoh

foot.

Replace hydro-booster

(para. 7-6).

Replace service brake pedal (para. 7-9).

The steering tests will check for suspension

problems that will affect braking.

TM 9-2320-387-24-l

BRAKE SYSTEM

HYDRO-BOOSTE

PB~P~BTIONING

VALVE

BRAKE

PEDAL

BUSHING

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