What are the reasons for car brake failure?

[McJohn]

Car brake failure is caused by worn and thinned brake pads or insufficient brake fluid, and continuing to drive under such conditions poses safety hazards. The braking system of a car is crucial for vehicle deceleration, as it technically ensures safe driving. New cars undergo a break-in period for the braking system during initial use, with the first 1,000 kilometers being the break-in period for new car brakes. It is recommended to avoid emergency braking during this time. Both brake pads and brake discs have a limited lifespan and must be replaced when worn beyond a certain point. The specific replacement interval depends on the vehicle's usage, but it is generally recommended to inspect them every 50,000 kilometers.

[DeCharlie]

I've spent many years in auto repair shops, and there are various reasons for brake failure. The most common is excessively worn brake pads. If you drive a lot or forget to replace them after long trips, the friction becomes insufficient, making it hard to stop. Insufficient brake fluid or air bubbles can also make the brakes feel soft or even fail entirely. Fluid leaks in the lines are especially dangerous and often occur in older vehicles. Additionally, master or wheel cylinder failures can render the entire system inoperable, causing the brake pedal to become unresponsive. Problems with the ABS system, such as a stuck sensor, can also affect braking performance. If you notice unstable braking or increased stopping distances, don't push your luck—pull over immediately. Check the fluid reservoir level, and if it's not normal, call a tow truck to take it to a professional shop. Regular maintenance is crucial—I recommend checking brake fluid condition and pad thickness every six months.

[VanMichael]

As an ordinary car owner, I personally experienced the terrifying moment of brake failure. In my case, the cause was a brake fluid leak, likely due to aging and cracked brake lines leading to insufficient pressure. The mechanic later mentioned that worn-out brake pads were also a contributing factor, especially since aggressive driving habits like frequent hard braking accelerate wear. Air entering the hydraulic system can make the brakes feel spongy and unresponsive, as if stepping on cotton. If you hear unusual noises or feel the front end shaking when braking, it might indicate warped brake rotors or loose calipers, requiring immediate inspection. Don’t forget to replace the brake fluid regularly—about every two years—to prevent issues. For safety, if you notice abnormal braking, gradually slow down and use the handbrake to assist in pulling over safely before calling for help.

[HaileyRose]

When driving my kids to and from school, I'm most concerned about braking issues, which often have simple causes. Brake pads wear thin over time, reducing friction and stopping power; insufficient or contaminated brake fluid can degrade performance. Small air leaks in the lines may also cause brake failure, especially during seasons with large temperature swings. You can perform simple checks at home: inspect front brake pad thickness—replace if too thin; pop the hood to check brake fluid reservoir level—top up or replace if below minimum. Avoid aggressive braking in daily driving to minimize wear. If brakes fail, stay calm, gradually slow down by shifting to lower gears or use the handbrake to pull over safely for assistance.