Which statement about DOT 5 brake fluid is correct?

Prepare for the Automotive Service Technician Period 1 exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which statement about DOT 5 brake fluid is correct?

Explanation:
Understanding that DOT 5 brake fluid is silicone-based is essential. Silicone-based fluids are not glycol-based, which means they don’t absorb moisture from the air the way DOT 3, 4, and 5.1 fluids do. That non-hygroscopic nature helps keep their moisture-related boiling-point issues lower, and it also means DOT 5 should not be mixed with glycol fluids. So the statement that DOT 5 brake fluid is silicone-based correctly captures its defining characteristic.

Understanding that DOT 5 brake fluid is silicone-based is essential. Silicone-based fluids are not glycol-based, which means they don’t absorb moisture from the air the way DOT 3, 4, and 5.1 fluids do. That non-hygroscopic nature helps keep their moisture-related boiling-point issues lower, and it also means DOT 5 should not be mixed with glycol fluids. So the statement that DOT 5 brake fluid is silicone-based correctly captures its defining characteristic.

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