Is Vacuum Extraction Required for Brake Fluid Replacement?
2 Answers
Vacuum extraction is required for brake fluid replacement. Methods for brake fluid replacement: The first method, commonly used in general repair shops, involves using a vacuum oil extractor to suck out the brake fluid from the drain port. After adding new brake fluid, the extraction continues until the discharged fluid is clear and free of air bubbles. The second method utilizes a brake fluid replacement machine. The principle involves pressurizing new brake fluid into the system in a fully enclosed environment, pushing out the contaminated fluid. However, this equipment is relatively expensive and has a single function, making it typically available only in well-equipped repair shops and 4S stores. Functions of brake fluid: Brake fluid effectively lubricates moving components of the braking system, extending the service life of brake calipers and rubber cups. It provides anti-corrosion and anti-rust properties, being non-corrosive to both metallic and non-metallic materials in the braking system. It adapts to various environmental conditions, ensuring reliable transmission of braking force under extreme conditions such as high temperatures, severe cold, high speeds, and humidity. Additionally, it serves to transmit energy and dissipate heat.
I've been repairing cars for almost ten years, and whenever I help fellow car enthusiasts change their brake fluid, I always recommend using the vacuum method first. It's not absolutely necessary, but the results are genuinely better—it completely removes the old brake fluid and any trapped air bubbles, preventing spongy or failed brakes due to air pockets. The gravity method is also quite popular, where you simply drain the fluid from the wheels, but it's prone to leaving some air in the system, leading to less responsive braking, especially during emergency stops, which can be dangerous. I've personally seen a few DIY attempts go wrong, where the brake pedal felt like a sponge. So, even though the vacuum method requires professional equipment like a vacuum pump, which is more expensive, it's worth it. Also, brake fluid absorbs moisture and degrades over time, so it should be replaced every two years. Don't underestimate this—it's a matter of safety, and it's best handled at a repair shop.
