Do all four wheels need to be bled when changing brake fluid?
1 Answers
All four wheels need to be bled when changing brake fluid. Introduction to brake fluid: Brake fluid, also known as automotive hydraulic brake fluid. Early vehicles used mechanical drum brakes. With the development of hydraulic technology, safe and reliable hydraulic brake systems became widely adopted in automobiles. Automotive brake fluid is the liquid used in hydraulic brake systems. When the driver presses the brake pedal, the force is transmitted by the master cylinder piston through the brake fluid to the wheel slave cylinders, causing the brake pads to expand and stop the vehicle. When braking stops, return springs pull the brake pads back to their original position. Function of brake fluid: Brake fluid serves as the force transmission medium throughout this process. Brake fluid has hygroscopic properties - if not replaced for extended periods, it can corrode the braking system and create driving hazards. Additionally, as brake fluid absorbs moisture, its boiling point decreases, which may lead to insufficient braking pressure and affect braking performance. Generally, it's recommended to replace brake fluid every two years or 40,000 kilometers.