Is It Normal for Brake Discs to Have Cracks?
2 Answers
There are two main reasons why brake discs develop cracks. One is due to poor quality of the brake discs themselves, and the other occurs when the brake discs are extremely hot from braking and then come into contact with water, such as when encountering a sprinkler truck or driving through a small puddle. This can easily cause cracks. Cracked brake discs may lead to breakage and should be replaced promptly. Below is relevant information: 1. Replacement Criteria: Generally, front brake discs need to be replaced around 80,000 kilometers. The exact mileage varies depending on individual driving habits, but there is a fixed threshold—if the groove depth of the brake disc exceeds 3MM, it must be replaced. 2. Maintenance: When preparing to wash your car, it is recommended to let the vehicle cool down naturally first. Wait for the brake discs to cool before proceeding with car washing and maintenance.
Recently, while helping out at the car dealership, I often come across the issue of cracked brake discs, which is absolutely abnormal. If brake discs develop cracks, especially small transverse ones, it’s usually due to overheating—caused by frequent hard braking or excessive load. It could also be a manufacturing defect or natural fatigue from prolonged use. The risks are significant: uneven force distribution during braking can lead to reduced braking efficiency, vibrations, or even disc shattering, which is highly dangerous at high speeds and can easily cause accidents. I’ve personally handled several cases where people delayed repairs until the brakes failed, resulting in doubled repair costs. My advice is to get them checked at a professional shop immediately upon noticing cracks and replace them if necessary—don’t skimp on safety. To prolong their lifespan, avoid aggressive driving and prioritize brake system inspections during regular maintenance.
