Castrol Brake Fluid DOT 4 is used in Automobile applications where they specify the use of either a DOT 3 or DOT 4 Brake Fluid. The benefit of using DOT 4 brake fluid over DOT 3 brake fluid is that they are fully compatible with each other however DOT 4 has a much higher boiling point. In automotive high performance applications, hard braking, hills and repetitive braking generates a lot of heat which leads to brake fade. DOT 4 brake fluid helps eliminate brake fade and the spongy brake feeling you get when the fluid overheats.
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