Question

while discussing brake fluids, technician A says hygroscopic brake fluid absorbs moisture from the air. Technician B says DOT 3 brake fluid has a higher boiling point than DOT 4 fluid. who is correct?

Answer 1

Technician A is correct in stating that hygroscopic brake fluid absorbs moisture, while Technician B is incorrect as DOT 4 brake fluid has a higher boiling point than DOT 3 fluid. The higher boiling point of DOT 4 brake fluid makes it less likely to vaporize under high temperatures.

Step-by-step explanation:

Regarding the schoolwork question on brake fluids, Technician A is correct that hygroscopic brake fluid absorbs moisture from the air. Brake fluids are indeed designed to absorb moisture to prevent water from pooling and causing corrosion in the brake system.

Technician B, however, is incorrect about the boiling points of DOT 3 and DOT 4 brake fluids. DOT 4 brake fluid typically has a higher boiling point than DOT 3 fluid. This is crucial because a higher boiling point means the fluid is less likely to vaporize in the high-temperature conditions found in braking systems, which could lead to brake failure.

Overall, correctly maintaining brake fluid is important for vehicle safety, as it helps to prevent brake failure due to boiling of the fluid under high-temperature conditions encountered during operations like steep descents, where engine braking is often a more suitable technique to prevent overheating.