ASE Brakes Certification Practice Exam 2025 – Complete Study Resource

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What is the function of a proportioning valve in a vehicle's brake system?

To reduce brake pad wear

To adjust braking force between the front and rear wheels

The function of a proportioning valve in a vehicle's brake system is primarily to adjust the braking force between the front and rear wheels. This is crucial because vehicles typically have a different weight distribution, which affects how much braking force each axle can handle. The proportioning valve helps ensure that the rear brakes don't lock up before the front brakes, especially during hard braking situations. This balancing act enhances vehicle stability and control, reducing the risk of skidding or loss of traction.

By controlling the brake pressure sent to the rear brakes relative to the front, the proportioning valve plays a key role in optimizing brake performance, enhancing safety, and improving the overall effectiveness of the vehicle's braking system.

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To enhance the performance of the ABS

To increase brake fluid pressure

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