ASE Brakes Certification Practice Exam 2025 – Complete Study Resource

Moisture absorption from the environment is a significant factor that can lead to brake fluid contamination. Brake fluid is hygroscopic, which means it has the ability to absorb moisture from the air over time. When brake fluid absorbs moisture, it can lower the boiling point of the fluid, leading to potential brake fade during heavy use and degrading the effectiveness of the braking system. Additionally, the presence of water in the brake fluid can promote corrosion within the brake components, which can cause further complications and damage to the braking system.

While excessive heat exposure is indeed a concern for brake performance and can result in fluid vaporization, it does not directly cause contamination in the same way that moisture does. Contact with road debris may pose risks to brake components, but it typically does not impact fluid purity. Lastly, using the incorrect type of brake fluid can compromise the braking system's functioning, but it is not a form of contamination; rather, it is an issue of compatibility and performance. Moisture absorption remains the primary concern regarding contamination in brake fluid.