Castrol Brake Fluid DOT 4 is used in Heavy Duty Truck 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 heavy duty applications, braking of heavy loads generates a lot of heat which leads to brake fade. DOT 4 brake fluid helps eliminate brake fade.
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