TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
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TM 9-2320-280-20-1 1-28. SERVICE BRAKE SYSTEM OPERATION The service brake system is identical for all models covered in this manual. It is an inboard-mounted, four- wheel, disc brake, hydraulically-assisted system. Major components of the braking system are: HYDRO-BOOST - Converts hydraulic power from the steering pump to mechanical power to the master cylinder, providing power assist during braking. MASTER CYLINDER/RESERVOIR - 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. ACCUMULATOR - Stores hydraulic pressure for additional power-assisted braking in case of loss of pressure in steering system. BRAKE PEDAL - Provides operator control for stopping vehicle. BRAKE LINKAGE - Directs brake pedal pressure to hydro-boost. 1-47