What is the reason for the outer edge of the brake disc not being worn?

[PaigeRose]

The reason why the outer edge of the brake disc is not being worn is introduced: The brake pads are uneven, and the brake pads should be replaced in time. Car brake pads, also known as car brake linings, refer to the abrasive materials fixed on the brake drum or brake disc that rotates with the wheel. The friction linings and friction blocks bear external pressure and generate friction to achieve the purpose of vehicle deceleration. The following is the relevant introduction about brake pads: 1. Brake pad maintenance: The braking effect of the car is determined by the brake pads, which are very important for the vehicle. Daily inspection and protection are indispensable. Under normal driving conditions, the brake shoes should be checked every 5,000 kilometers. Not only the remaining thickness should be checked, but also the wear state of the shoes, whether the wear on both sides is the same, whether the return is free, etc. Any abnormal situation must be dealt with immediately. When the thickness of the brake pads is about 0.5 cm, they should be replaced. 2. Brake pad replacement: It is best to replace the brake pads with the original spare parts provided by the manufacturer. Only in this way can the braking effect between the brake pads and the brake disc be the best, and the wear is the smallest. After replacement, be sure to step on the brakes several times to eliminate the gap between the shoes and the brake disc, otherwise, the first step may not brake, which can easily cause an accident.

[Lawson]

I've seen this situation quite often. The outer edge of the brake rotor not being worn usually happens because the brake pads are too small or improperly installed, failing to fully cover the rotor surface. It could also be due to stuck caliper pistons that can't evenly push the pads to contact the entire rotor. Additionally, rust or dirt on the guide pins can restrict pad movement, causing only the middle section to wear. Personally, I've also encountered slight rotor warping leading to uneven wear. This not only reduces braking efficiency but can also cause noise and increase stopping distance, posing serious safety risks. Regular maintenance should include lubricating guide pins and checking pad thickness. If you notice unworn areas on the rotor edge, visit a professional shop immediately before the rotor gets ruined or accidents occur. Avoid sudden braking in daily driving to minimize extra wear - this might seem minor but directly impacts safety.

[SarahLynn]

As someone who frequently works on car repairs, I've found that the main reasons for the outer edge of brake discs not wearing down are often due to mismatched brake pad sizes or improper installation. If the caliper guide pins are rusted, they can also restrict pad movement, leading to insufficient edge contact. Sometimes, it's caused by disc heat deformation or manufacturing defects. If left unaddressed, this issue can wear down other components and increase repair costs. I recommend focusing on cleaning and lubricating the guide pins during inspections to ensure the pads slide freely. While driving, pay attention to any brake shudder or unresponsiveness and pull over for a check immediately. Maintaining regular brake system maintenance, including cleaning and measuring disc-pad clearance, can significantly reduce this risk and make driving more reassuring.

[VanBraxton]

As an average car owner, I often worry about such brake issues. If the edges of the disc aren't being worn, it's likely because the pads are too small and don't provide full coverage, or the caliper pistons are stuck and not pushing the pads evenly. Rusted guide pins can also cause this problem. This leads to reduced braking power, making the pedal feel soft or causing vibrations while driving. I remind myself not to ignore these signs because the risks are high. A simple self-check involves inspecting pad thickness and ensuring smooth movement. If any abnormalities are found, immediate repair is necessary to prevent minor issues from escalating. Driving with fewer sudden stops in daily use can extend component lifespan—safety always comes first!