ASE Auto Maintenance and Light Repair Certification (G1) Practice Test

Question: 1 / 400

Which statement regarding brake fluid is true?

DOT 3 has a higher boiling point than DOT 4

DOT 4 is not compatible with ABS systems

DOT 5 should not be used in vehicles with ABS

The statement that DOT 5 should not be used in vehicles with ABS is accurate because DOT 5 brake fluid is silicone-based and has different properties compared to glycol-based fluids like DOT 3 and DOT 4. One of the key reasons for avoiding DOT 5 in vehicles equipped with ABS is that it does not mix well with moisture and can lead to air bubbles forming in the brake system, which can impair braking performance. Additionally, the viscosity and compressibility of DOT 5 can negatively affect the operation of ABS, which relies on specific fluid characteristics for optimal performance. Using the appropriate brake fluid is crucial for maintaining the integrity and functionality of the ABS and overall brake system, which validates the correctness of this statement.

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DOT 3 is always better than DOT 4

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