TM 9-2320-289-20(5)(6)Combination Valve. Performs 3 distinct functions:(a) Limits pressure to front disc brakes until a predetermined front inputpressure is reached, which allows for the overcoming of the rear shoeretractor spring pressure.(b) Proportions outlet pressure to rear brakes after a predetermined rear inputpressure has been reached.(c) A bypass feature assuring full system pressure to rear brakes in the eventof front brake malfunction.Height Sensing, Brake Proportioning Valve (All Except M1009). Providesoptimum brake balance and efficiency by distributing braking force to front andrear wheels as determined by payload.1-22.STEERING SYSTEM.a. Consists of the following major assemblies:(1) Steering Wheel, Column, Intermediate Shaft, and Coupling. Mechanicallyactivated by operator.(2) Power Steering Pump. Runs continuously, supplying hydraulic power to powersteering gear.(3) Power Stearing Gear. Receives hydraulic power from power steering pump andmechanical force from driver through steering wheel, column, intermediateshaft, and coupling. Power steering gear can operate mechanically if hydraulicsystem failure occurs.(4) Steering Linkage. Mechanical linkage between power steering gear andaxle-mounted steering components.(5) Axle-mounted Steering Components. Receive mechanical force from steeringlinkage to actually turn wheels.b. The following illustration shows, in simplified form, how the steering system works.TA496241-17
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