What is the operation process for replacing brake fluid?

[VonMiguel]

The operation process for replacing brake fluid is: 1. Use a machine to suck out the brake fluid from the drain nut, then continuously add new brake fluid to the reservoir and repeat the operation; 2. Continue until the discharged brake fluid is clear and free of air, then use the same method to replace the brake fluid for the remaining three wheels. Brake fluid, also known as hydraulic fluid, should be purchased from reliable manufacturers, and the higher the grade, the better. All liquids have the characteristic of being incompressible. In a sealed container or a pipeline filled with liquid, when the liquid is under pressure, it quickly and uniformly transmits the pressure to all parts of the liquid. Hydraulic braking works based on this principle.

[VonLily]

As an auto mechanic for many years, I frequently perform brake fluid replacement jobs. The entire process must be executed step by step: First, prepare tools including new brake fluid, a container, tubing, a wrench, and gloves. Safety first—find a level ground to lift and stabilize the vehicle's tires. Next, locate the brake master cylinder reservoir and remove some old fluid to prevent overflow. Then, follow the bleeding sequence starting from the point farthest from the pump—traditionally, the left rear wheel first. Loosen the bleeder screw, connect the tube to drain the old fluid into a bottle, wait until the flow clears or runs out, then tighten the screw. Repeat the same operation for the left front wheel, followed by the right front wheel and then the right rear wheel. Finally, ensure all screws are tightened securely without leaks. After draining, refill with new DOT4-type brake fluid, start the engine, and gently pump the brake pedal a dozen times to purge air bubbles. Check if the pedal is firm and doesn’t wobble. Once completed, test-drive at low speed to verify brake response and prevent accidents. Why this specific sequence? To avoid air remaining in the system, which could lead to brake failure. A vacuum pump can simplify the process for efficiency. Safety reminder: Wear goggles to prevent fluid splashes into the eyes. Replace the fluid every two years to prevent moisture corrosion and boiling point degradation hazards.

[McHolden]

As a passionate DIY enthusiast, I find joy in changing brake fluid myself. The process is straightforward but requires preparation: having a partner to help pump the brakes inside the car makes it safer. I laid cloth on the garage floor for cleanliness. First, use a small wrench to loosen the wheel hub's bleeder screw, attach a plastic tube to an empty bottle, and let the old black fluid drain. After finishing the left rear wheel, tighten the screw and add new fluid to rinse the reservoir, then repeat the process on the right rear wheel until the fluid runs clear. Once the reservoir is full of new fluid, have your partner slowly pump the brakes to bleed air bubbles until the pedal firms up. During testing, take a short drive to feel the strong pedal response—just don’t brake too hard. The benefits include saving money and time while gaining a deeper understanding of your car’s maintenance. Key tip: don’t use the wrong fluid type—check your manual for DOT 3 or 4 specifications. A common DIY pitfall is not tightening the screw promptly, allowing air in and weakening the brakes, requiring a redo. I recommend first-timers use a transparent bottle to monitor the fluid until it turns clear. Two weeks ago, I did this and saved on repair costs while extending my brake system’s lifespan.

[SanAubree]

As a first-time DIYer changing brake fluid, I was nervous but careful. I learned the steps from YouTube videos: first park safely, loosen the bleeder screw on the wheel, attach a tube to drain the dirty fluid into a bottle. The key is to prevent anyone from pressing the brake pedal to avoid loss of control and damage. After draining the old fluid, slowly add new fluid without overfilling the reservoir. Gently pump the brake pedal a few times to remove air bubbles, ensuring firmness without sponginess. Then tighten all screws and test drive a short distance, avoiding sudden brakes to prevent failure. Why change the fluid? Old fluid absorbs moisture, making brakes feel soft and risking pressure loss in critical moments. Safety first—if inexperienced, visit a professional shop for peace of mind. I saved money with simple tools but kept the environment clean.

[ArthurFitz]

With decades of driving experience, changing brake fluid is as routine as daily chores. Typically performed every two years or 30,000 kilometers to prevent system corrosion and failure. Basic steps: Clear old fluid, fill with new DOT4 matching the vehicle model. Bleeding starts from the wheel farthest away—left rear first—attach tube until sufficient flow, then tighten. After refilling, gently press the pedal to purge air bubbles, check for stable pressure before tightening screws. Test brakes with slow starts to avoid mishaps. Key notes: Never mix fluid types; simple tools like wrenches suffice for safety. Reminder: Ensure ventilation, wear gloves and protective gear to prevent chemical exposure.