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Brakes 101: What are the Different Types of Brake Fluids?

Brakes 101: What are the Different Types of Brake Fluids?

Brake fluid is the hydraulic substance that converts force into pressure when a driver steps on the brake pedal. This conversion causes the brake pads to clamp down on the vehicle's brake rotors, which slows down or stops a car. Since the braking system experiences high temperatures, brake fluid is made with very high wet and dry boiling points to avoid vaporization. Its wet boiling point, which is when the fluid boils once moisture is absorbed, is lower than the dry boiling point. There are four main types of brake fluid designated by the U.S. Department of Transportation, each with designated boiling points and fluid bases and for specific vehicles.

what is brake fluid
Types of Brake Fluid

Brake Fluid Type

Wet Boiling Point

Dry Boiling Point

Base

Vehicles

DOT 3

284° F401° FPolyethylene glycolCars, pickup trucks and SUVs

DOT 4

311° F446° FPolyethylene glycolCars, pickup trucks and SUVs

DOT 5

356° F500° FSiliconeCars without anti-lock brake systems

DOT 5.1

356° F500° FPolyethylene glycolHigh performance or racing vehicles