How to Use Brake Fluid?
2 Answers
Brake fluid usage instructions: Different types of brake fluid should not be mixed, as this will reduce the braking effectiveness of the vehicle; avoid mixing gasoline, diesel, or engine oil into the brake fluid. Automotive brake fluid is the liquid used in hydraulic braking systems, which must be chemically inert, unaffected by high temperatures, and should not cause corrosion, softening, or swelling to metals and rubber. Common types include DOT3, DOT4, and DOT5. The volume of brake fluid changes with temperature, so the brake fluid reservoir is equipped with a vent hole. The air drawn in through this hole may contain moisture or impurities, which can be absorbed or dissolved by the brake fluid. Consequently, brake fluid containing moisture will have a lower boiling point.
When it comes to brake fluid, I believe the most crucial aspect in daily use is regular replacement. After driving for ten years, I've noticed many car owners overlook the fact that brake fluid absorbs moisture, which diminishes braking effectiveness over time. I recommend checking the fluid reservoir level under the hood every 20,000 kilometers, ensuring it stays between the min and max marks. Always use the manufacturer-specified grade when topping up—DOT4 is the most common, but never mix different types. If you notice the brake pedal feeling soft or the travel distance increasing, promptly check for leaks in the brake lines. In such cases, avoid DIY repairs and take the car to a professional mechanic who can properly bleed the system with specialized equipment. Also, be cautious during car washes to prevent water from contaminating the brake fluid, as it lowers the boiling point and compromises braking performance.
