Is There a Difference Between Good and Bad Brake Fluid?
2 Answers
Here are the differences between good and bad brake fluid: 1. Taste: Genuine brake fluid has a slightly sweet smell, while fake brake fluid smells foul, with an alcohol-like odor. 2. State: Genuine brake fluid is yellow, resembling honey diluted with water, and feels warm to the touch; fake brake fluid is made by mixing water and alcohol, so it appears clear. Using fake brake fluid in a vehicle can cause brake failure while driving, leading to serious consequences. Below are the reasons for brake fluid leakage: 1. Brake hose rupture: The brake hose connects the brake pump and the brake caliper. When the brake pedal is pressed, brake fluid is transmitted through the hose to the caliper piston, which then pushes the brake pads to squeeze the brake disc, creating the braking effect. If the brake hose ruptures, oil leakage will inevitably occur, affecting the vehicle's braking performance. Therefore, timely repairs are essential. 2. Damaged sealing ring: Brake fluid is highly corrosive. Although sealing rings are resistant, they can age slightly over time, reducing their sealing effectiveness and leading to oil leakage. Simply replacing the sealing ring can resolve this issue. 3. Loose or damaged hose screw: The hose screw is used to seal the brake fluid inside the hose. If the screw is damaged, oil leakage will naturally occur. If it is only loose, tightening it will suffice.
With years of experience in car repair, I've seen numerous failures caused by poor-quality brake fluid. There's definitely a difference between good and bad fluids. High-quality fluid has a high boiling point, ensuring stable and reliable braking even when temperatures soar during emergency stops, as it won't vaporize. In contrast, low-quality fluid has a lower boiling point, easily absorbs moisture, and deteriorates. When water turns into steam under high temperatures, compressibility worsens, making the pedal feel spongy and increasing braking distance—a dangerous scenario. Inferior fluid also corrodes wheel cylinders and lines, leading to leaks or sticking, which are time-consuming and costly to fix. I always recommend using DOT 4 or higher-grade fluid, avoiding cheap, substandard products. Replace it every two years or 20,000 kilometers—safety should never be compromised.
