What is Brake Fluid?
Brake fluid is used to transmit brake pressure in the hydraulic brake system. It ensures that the force applied to the brake pedal is converted into a hydraulic pressure and this pressure is transmitted to the wheel caliper pistons, thus braking the pads by pressing the disc.
Brake fluid is a corrosive and poisonous liquid. Brake fluid must not come into contact with the human body or painted surfaces. In case of contact with the human body, wash with plenty of water and apply to the hospital.
 
Brake fluid prevents metal parts in the brake system from rusting and oxidation, and works in harmony with the plastic-rubber gaskets and seals in the system. In the brake system, high temperature occurs due to friction in the pads and pressure in the brake hydraulic system, the brake hydraulic oil can work stably at these high temperatures without losing its properties.
Brake hydraulic oil, which has a strong chemical structure, is also used in industry to loosen rusty bolts and nuts, and to remove stuck metal parts.
 
What Does DOT Mean in Brake Fluid? What are the Characteristics of Brake Fluid?
DOT is an abbreviation of English Department of Transport, meaning US Department of Transportation. The properties (boiling points) that must be found in hydraulic oil, determined by the US Department of Transportation, have become standardized as DOT numbers and accepted in the industry.
Since high temperatures occur during braking, brake hydraulic oils should be resistant to high temperatures and should not lose their properties at high temperatures.
The meanings of the DOT numbers give the boiling points of the hydraulic oil.
DOT 3 : 205 heC
DOT 4 : 230 heC
DOT 5.1 : 260 heC