What are the precautions for replacing brake fluid?

[BraydenRose]

Precautions for replacing brake fluid include: 1. Avoid introducing air into the brake fluid. Changing brake fluid requires careful coordination between two people to prevent accidental air ingress. One person should drain the fluid while observing, and the other should repeatedly press the brake pedal. New fluid must be replenished promptly and continuously. 2. Tighten the drain bolt to prevent leaks. Brake fluid is corrosive and can affect other car components. 3. Avoid introducing impurities and dust into the brake fluid. Brake fluid, also known as brake hydraulic fluid or braking liquid, is made from refined diesel distillates with thickeners and antioxidants. There are three types: mineral oil brake fluid, alcohol-based brake fluid, and synthetic brake fluid.

[Chad]

I've got some real experience to share about brake fluid replacement. During regular maintenance at the 4S shop, I learned you should never exceed the recommended interval - generally every two years or 40,000 km, as old fluid absorbs moisture and affects braking performance. Choosing the right specification is crucial; my car uses DOT4, but always check your manual. The bleeding process is particularly important - last time I watched the mechanic carefully cycle fresh fluid through the system, ensuring all four wheels were properly bled. After replacement, always test the pedal feel; if it's spongy, there might be air trapped. Final reminder: avoid getting fluid on your paintwork during the process, as it's corrosive.

[LukeDella]

When performing brake fluid replacement, the most critical aspect to pay attention to is the bleeding process. If air isn't completely purged, it can create safety hazards in the braking system. Make sure the mechanic uses specialized equipment and continuously pumps the brake pedal during fluid replacement to bleed the system. Never mix different specifications of brake fluid - I've seen cases where random mixing of DOT4 brands caused blockages in the hydraulic lines. Always maintain sufficient fluid level in the reservoir to prevent air from entering. Finally, remember that used brake fluid is hazardous waste and should never be poured down the drain.

[DelRose]

Veteran drivers recommend changing the brake fluid on time, as it becomes dangerous when deteriorated. I've seen too many brake failure accidents, mostly related to long-term neglect of fluid replacement. The most critical part is using qualified products—don't cheap out and buy no-name brands from small workshops. Also, pay attention to the mechanic's operation—avoid shops that rush and don't fully bleed the air. After replacement, be sure to test on a safe road by pressing the brake pedal a dozen times to check feedback strength. Finally, a reminder: before changing the fluid, ensure the master cylinder seals are intact. I've encountered cases where aged seals caused all the new fluid to leak out.