How many kilometers should brake discs be replaced?

[StDakota]

Brake discs generally need to be replaced when the vehicle has traveled 80,000 to 100,000 kilometers. Below are the classifications of brake discs and the criteria for determining when replacement is necessary: Classifications of brake discs: Brake discs can be divided into solid brake discs and ventilated discs based on their structural form. Based on material differences, they can be categorized into carbon fiber ceramic brake discs and metal brake discs. Criteria for determining when brake discs need replacement: Observe the brake disc warning light. Normally, the brake disc indicator light is off. When the brake disc malfunctions or is excessively worn, the light will turn on and will turn off after repairs; Check the thickness of the brake disc. Most brake disc products have wear indicators. When the total wear depth on both sides of the brake disc reaches 3mm, it is recommended to replace the brake disc promptly; Listen for sounds. If there are abnormal noises when lightly applying the brakes, the brake pads must be replaced immediately.

[SanAxel]

I’ve always believed the braking system is the most critical for safety. I remember once when my brakes almost failed because the discs were worn thin. Actually, there’s no absolute mileage for replacing brake discs—it depends on multiple factors. For normal driving, inspecting them every 60,000 to 80,000 kilometers is reasonable, but if you frequently brake hard or drive in harsh conditions like mountain roads or congested urban areas, you might need to check them by 50,000 kilometers. The key is wear: new discs are about 30mm thick, and if they’re worn down to 24mm or less, it’s time to replace them. Signs like steering wheel vibration or squeaking noises during braking are red flags. Regular checks can prevent major issues—I’ve seen a friend ignore warnings and end up in an accident due to longer braking distances. I recommend asking your mechanic to measure disc thickness with calipers during every service—safety first, don’t skimp on this. Also, regularly clean the brake components during car washes to prevent rust and extend their lifespan. In short, driving safety is no small matter—never delay replacements until it’s too late.

[JackLynn]

When I do my own car repairs, replacing brake discs is one of my favorite projects. There's no fixed mileage standard; I usually check the discs every two brake pad changes, roughly around 60,000 kilometers. Measuring thickness with calipers is straightforward—anything below 24mm warrants replacement. DIY work requires proper tool preparation, and ensuring the car is securely lifted and stabilized is crucial. Some cars have wear indicator grooves on the brake discs; if the depth is less than 1.5mm, it's a clear signal. Doing it yourself saves money—a new set of discs costs just a few hundred bucks, much cheaper than the thousand or so charged by repair shops. But safety can't be overlooked—make sure the environment is safe before starting. Regularly check for deep grooves on the surface after washing the car to avoid major repairs down the line. In short, sticking to DIY maintenance is cost-effective, hassle-free, and helps you understand your car better.

[LeHaven]

Brake disc replacement is generally checked at 60,000 to 80,000 kilometers, which is the experience I learned from veteran drivers. There's no strict rule because everyone's driving conditions vary; gentle driving might extend it to 90,000 kilometers, while aggressive braking could require replacement as early as 40,000 kilometers. My car's discs were measured at 23mm remaining at 70,000 kilometers, so I replaced them. Many factors affect this, such as humid weather accelerating rust and shortening lifespan. It's recommended to have the thickness checked for free during every dealership service to easily prevent hazards. Don't wait for squealing or brake shudder—paying attention to these small signals ensures smooth driving and saves money.