Why is there a groove on the brake pad?
If you are an “veteran driver”, or if you are a good observer, you will find some differences in the appearance of different brake pads. Like, some brake pads have a groove on the surface and a chamfer on the edge, but other brake pads do not. So what are the functions ?
? The groove on the surface of the brake pad can quickly discharge the powder debris generated by the friction between the brake pad and the brake disc to prevent the debris from adhering to the friction surface between them, which would result in scratches on the brake disc and affect the braking effect.
? The groove on the surface of the brake pad can change the natural frequency of the brake pad, which helps to eliminate the noise during braking. The chamfer on the edge of the brake pad also has this function.
? The groove on the surface of the brake pad can speed up the air flow, so that the heat generated by friction is dissipated more quickly, so as not to affect the braking effect.
? The groove on the surface of the brake pad allows the rain to drain quickly, which increases the friction force between the brake pad and the brake disc on rainy days and improves the braking performance when it is raining and when wading through the water.
Brake pads are usually replaced about every 30,000-50,000 km. The actual mileage interval is directly related to driving habits and brake pad quality.
? When the brake pads are replaced, you will see dents on the surface of the brake disc due to wear. The new brake pads cannot be closely fitted to the old brake discs, and abnormal noise will occur when they are working in concert. Therefore, to reduce the chance of brake noise, some new brake pads are chamfered at the edge, allowing the new brake pad to be staggered from the raised steps on the edge of the old brake disc.
? Some brake pads are not chamfered. If the dents and bulges due to wear on the surface of the brake disc are not deep, the new brake pad and the old brake disc can also achieve good braking effect after running for a period of time. If the dents on the surface of the brake disc have reached the extent requiring replacement, it should be replaced in time, otherwise the life of the new brake pad will be shortened and the braking effect will be affected.
Operations need to be treated with caution
In practice, some maintenance personnel use a tool to make a groove or chamfer on the surface of the brake pad. This should be treated with caution.
? First of all, the production of brake pads follows strict processing techniques, and the brake pad shape and surface treatment process must reach strict quality standards in order to meet the braking performance requirements. If the surface shape of the brake pad is changed unilaterally, such as making grooves, it will affect the strength of the brake pad friction material, and even cause the friction material to break or fall off, causing serious consequences. Therefore, it is not recommended to make a groove or otherwise change the surface shape of the brake pad during installation.
? For abnormal noise from brake pads after replacement, some maintenance personnel grind the surface of the brake disc or chamfer the edge of the brake pad. These operations can sometimes eliminate the noise. However, some use a motor driven tool such as a grinding wheel to chamfer the brake pad, which does not allow for precise operation, and may reduce the strength of the brake pad friction material, thereby creating a potential safety hazard.Therefore, the brake disc with deep dents should be replaced at the same time when the brake pad is replaced to achieve good braking effect and reduce the chance of abnormal brake noise.
Whether there is a groove or chamfer on the surface of the brake pad is usually just due to different design concepts of different brake pad manufacturers. As long as it is a brake pad product produced by a proper manufacturer, it has already met the relevant industry standards and can be used with confidence.
As one of the world’s leading manufacturers of friction, Remsa offers high quality brake pads covering mainstream vehicle series in Europe, America, Japan, Korea and Australia.