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 57 of 1205
TM9-2320-387-24-l
1 l-26.
SERVICE BRAKE SYSTEM OPERATION
1
The service brake system is identical for both models covered in this manual. It is an inboard-mounted, four-
wheel, disc brake, hydraulically-assisted system. Major components of the braking system are:
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A
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B
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C
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D
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E
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F
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G
BRAKE LINEAGE - Directs brake pedal pressure to hydro-booster.
HYDRO-BOOSTER
- Converts hydraulic power from the steering pump to mechanical power to
the master cylinder, providing power assist during braking.
MASTER CYLINDEIURESERVOIR
- Stores brake fluid, and converts mechanical pedal pressure
to hydraulic pressure.
PROPORTIONING
VALVE - Provides balanced front-to-rear braking and activates brake
warning lamp in case of brake system malfunction.
ACCUMIJLATOR - Stores hydraulic pressure for additional power-assisted braking in case of loss
of pressure in steering system.
BRARE PEDAL - Provides operator control for stopping vehicle.
BRAKE PRESSURE LIMITER - Limits front brake line pressure to prevent brake lockup.
1-33
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