What phenomena occur when brake fluid is low?
3 Answers
Insufficient brake fluid can lead to a weak braking response when pressing the brake pedal and may affect braking performance, among other issues. If the decrease in brake fluid is due to normal wear of the brake pads, simply adding some brake fluid to bring the level between the two marked lines on the reservoir is sufficient. Phenomena of weak response: Experiencing a weak response when pressing the brake pedal; Impact on braking performance: This can allow air to enter the brake lines, leading to brake failure. To maintain the vehicle's normal driving performance and braking efficiency, it is essential to regularly replace the brake fluid, ensuring the braking system's performance and the longevity of its components.
That day when I was driving downhill and stepped on the brake, I clearly felt the pedal become soft, like stepping on a sponge. Glancing at the dashboard, I was shocked to see the brake warning light on, so I quickly pulled over. Upon checking the brake fluid reservoir, I found the level was below the minimum mark. It turns out that low brake fluid leads to insufficient hydraulic pressure, causing longer pedal travel. Initially, it might just feel like softer braking, but continuing to drive becomes increasingly dangerous. Once, my friend's car had aged brake lines that were leaking, and the brakes suddenly failed, nearly causing a rear-end collision. Now during every maintenance session, I make sure the mechanic checks the brake fluid condition—this is a matter of life and death and can't be taken lightly. You can also pop the hood yourself occasionally to check if the fluid level in the transparent reservoir is between the MIN and MAX marks. If it's below standard, address it immediately.
As someone who frequently drives long distances, I pay special attention to the braking system. The most obvious sign of insufficient brake fluid is increased braking distance, making it impossible to stop in emergencies. During my last maintenance, the technician demonstrated the principle to me: insufficient fluid allows air to enter the brake lines, creating noticeable free travel when pressing the pedal, and in severe cases, the pedal can be pressed all the way to the floor. Now, before taking mountain road curves, I always lightly press the brake twice to confirm the pedal feel, and if I notice anything unusual, I stop immediately to check. I also heard from the repair shop mechanic that brake fluid is highly hygroscopic, and over time, excessive moisture can cause the fluid to expand and overflow. That’s why replacing the fluid every two years is crucial—never wait until the reservoir is empty to address it.
