ASE Brakes Certification Practice Exam 2025 – Complete Study Resource

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Technician A says that increasing moisture levels in brake fluid decrease its boiling point. Technician B states that boiling brake fluid results in a spongy pedal and loss of braking effort. Who is correct?

Technician A

Technician B

Both Technician A and Technician B

Both technicians are correct in their statements regarding brake fluid.

Moisture in brake fluid significantly affects its boiling point. As brake fluid absorbs moisture from the air over time, the boiling point of the fluid decreases. This is crucial because brake fluid needs to handle the high temperatures generated during braking without boiling; if it does, it can lead to vapor formation, which compromises the hydraulic pressure needed for effective braking.

When brake fluid boils, it creates vapor bubbles within the brake lines. This phenomenon indeed results in a spongy brake pedal, as the pedal feel relies on the incompressibility of the hydraulic fluid. With vapor present, the brake system loses hydraulic pressure, leading to a reduction in braking effectiveness. Therefore, the statements made by both technicians accurately reflect how moisture levels in brake fluid can affect brake performance.

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Neither Technician A nor Technician B

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