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Answer :
The valves used to balance front and rear braking force on a current FMVSS-121 compliant highway tractor are the load sensing valve (LSV) and the proportioning valve (PV).
The load sensing valve (LSV) is responsible for monitoring the load on the tractor and adjusting the rear braking force accordingly. It does this by sensing the weight distribution between the front and rear axles and adjusting the pressure to the rear brakes.
On the other hand, the proportioning valve (PV) helps to balance the braking force between the front and rear wheels. It ensures that the rear brakes do not lock up before the front brakes, especially during heavy braking or on slippery surfaces. The proportioning valve achieves this by limiting the pressure to the rear brakes.
Both the load sensing valve and the proportioning valve play a crucial role in maintaining balanced braking force on a highway tractor. By adjusting the braking force to the appropriate axle and preventing wheel lock-up, these valves enhance the overall safety and control of the vehicle under varying operating conditions.
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