Can a car with DOT3 use DOT4?
1 Answers
DOT3 and DOT4 brake fluids cannot be mixed. Here are some related details about brake fluid: 1. DOT3 and DOT4 brake fluids cannot be mixed, as doing so would lower the dry and wet boiling points of the brake fluid. This not only increases the chance of system vaporization causing vapor lock, leading to delayed or even failed braking, but also affects the stability of the brake fluid, posing certain risks during continuous braking. 2. Brake fluid, also known as hydraulic brake fluid, serves as a functional liquid in a car's hydraulic braking system to transmit pressure, enabling the wheel brakes to function. Most modern cars use hydraulic braking systems, where the brake fluid acts as the liquid medium to transmit braking force throughout the system. The working pressure of brake fluid is typically 2MPa, with some systems reaching 4-5MPa. Since liquid is difficult to compress, when the brake pedal is pressed, the pressure is transmitted to the master cylinder and then through the brake fluid to the wheel cylinders, generating significant braking force.