How long does the new brake pads need to be worn in?
During each maintenance, the brake pads should be inspected, repaired, or replaced. If the friction block loss is found to be less than 1mm, it needs to be replaced. (Generally speaking, it is replaced every 30000 to 40000 kilometers). And the newly replaced brake pads also need to go through a certain period of running in to effectively maximize their braking effect.
Why do brake pads need to be worn in after replacement?
Brake pads are divided into disc brakes and drum brakes, and the materials generally include resin brake pads, powder metallurgy brake pads, carbon composite brake pads, and ceramic brake pads; After using the brake pads and brake discs for a period of time, they will wear and tear, and the contact surface between the two will appear many unevenness. The brake pads and brake pads are in close contact, which is somewhat similar to the meshing between gears. At this time, the contact area between the brake pads and brake discs remains the maximum, and the braking capacity is also relatively strong.
Why not run on the highway after replacing the brake pads?
The reason is simple, the new brake pads appear to be a flat surface. After installation, the contact surface between the brake pads and the brake disc is not 100! It is possible that several points have come into contact. If the high speed and local overheating occur at these points, the metal will undergo quenching effect. The hardness of those points is harder than that of the surrounding metal In the future, there will be noise and slipping when used, and there will also be grooves of varying depths. In addition, after replacing with a new brake pad, the surface of the brake pad is relatively flat, while the contact surface on the brake disc is very uneven, which can cause a phenomenon similar to "a piece of soap on the washing board". So don't immediately run on the highway after replacing the brake pads.
How do the newly replaced brake pads break in?
Usually, a new brake pad needs to be worn in for 200 kilometers to achieve optimal braking effect. Therefore, it is recommended that vehicles that have just been replaced with new brake pads should be driven with caution. Under normal driving conditions, the brake pads should be inspected every 5000 kilometers.
Specific method for running in new brake pads
1. After completing the installation, find a place with good road conditions and few cars to start running in.
2. Accelerate the car to 100 kilometers per hour.
3. Gently apply the brake with moderate force to reduce the vehicle speed to approximately 10-20 kilometers per hour.
4. Release the brake and drive for a few kilometers to cool down the temperature of the brake pads slightly.
5. Repeat steps 2-4 above at least 10 times.
1. In each braking cycle from 100 to 10-20 km/h, there is no strict requirement for accurate speed. Accelerating to approximately 100 km/h can start this braking cycle.
2. When you brake to 10-20km/h, there is no need to keep a close eye on the speedometer. Just keep your eyes on the road and make sure to pay attention to road safety. About every braking cycle, you can brake to about 10-20km/h.
3. During these ten braking cycles, the vehicle cannot be braked until it comes to a stop, unless you wish to incorporate the brake pad material into the brake disc, causing brake vibration;
4. The method of breaking in the new brake pads is to use fractional brake applications as much as possible, and do not use emergency brakes until they are fully bedded in.
5. After running in, the brake pads still need to go through a running in period of several hundred kilometers with the brake discs to achieve optimal performance. At this time, it is necessary to drive carefully to prevent accidents from happening.
The contact surface between the brake disc and the brake pad may have many grooves or hard spots caused by overheating, forming close contact between the grooves and peaks on the contact surface of the brake disc and the grooves and peaks on the contact surface of the brake pad. At this point, the contact area between the two remains at its maximum, indicating that the braking force remains at its maximum and meets the design requirements of the original factory. If you want to run in the brake pads and brake discs as soon as possible, it is recommended to replace or polish the brake discs every time the pads are changed.