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Synthetic Brake Fluid DOT 4
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Sell Synthetic Brake Fluid DOT 4

Specification of Synthetic Brake Fluid DOT 4

Synthetic Brake Fluid DOT 4 

DOT 4 is one of several designations of automotive brake fluid, denoting a particular mixture of chemicals imparting specified ranges of boiling point.

In the United States, all brake fluids must meet Standard No. 116; Motor vehicle brake fluids.[1] Under this standard there are three Department of Transportation (DOT) minimum specifications for brake fluid. They are DOT 3, DOT 4, and DOT 5.1.

DOT 4, like DOT 3 and DOT 5.1, is a polyethylene glycol-based fluid (contrasted with DOT 5 which is silicone-based). Fluids such as DOT 3, 4, and 5.1 are hygroscopic and will absorb water from the atmosphere. This degrades the fluid's performance, and if allowed to accumulate over a period of time, can drastically reduce its boiling point. In a passenger car this is usually not much of an issue as the brakes are generally not used aggressively, but can be of serious concerns in police vehicles, racecars or motorcycles due to the higher heat generated during their much more aggressive braking, and trucks where higher heat can be generated while braking hard and fully loaded.

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