Technician A says DOT 3 and DOT 4 brake fluids have a higher boiling point than DOT 5. Technician B says DOT 4 brake fluid has a higher wet boiling point than DOT 5. Who is correct?

Question

Quizplus · Accepted Answer

DOT 5 brake fluid, which is silicone-based, generally has a higher boiling point than both DOT 3 and DOT 4, which are glycol-based. DOT 4 does have a higher wet boiling point than DOT 3, but not higher than DOT 5.

Technician a Says DOT 3 and DOT 4 Brake Fluids