Automotive Service Excellence (ASE) Brakes Certification Practice Exam 2025 – Comprehensive All-in-One Guide to Exam Success!

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What does the 'proportioning valve' do in brake performance?

It adds additional pressure to the brake system

It adjusts brake pressure to the front and rear wheels

The function of the proportioning valve in a braking system is to adjust the brake pressure between the front and rear wheels. This is crucial for maintaining optimal braking performance, especially in vehicles with front disc and rear drum brakes or those that have different braking capacities in various wheel pairs.

During normal braking, the proportioning valve regulates the flow of brake fluid to both the front and rear brakes to ensure that the rear brakes do not lock up before the front brakes. This is particularly important in maintaining vehicle control and stability, especially in emergency braking situations or when the vehicle is heavily loaded. By balancing the brake force applied to each axle, the proportioning valve helps prevent skidding or loss of traction, allowing for safe and effective braking.

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It stabilizes the braking force during sudden stops

It monitors brake fluid levels

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