Why does the braking distance become longer after replacing the new brake pads?

After replacing the new brake pads, the braking distance may become longer, and this is actually a normal phenomenon. The reason behind this is that the new brake pads and the used brake pads have different levels of wear and thickness.

When brake pads and brake discs are used for a certain period, they undergo a run-in process. During this run-in period, the contact surface between the brake pads and the brake discs increases, resulting in a lot of unevenness on the brake pads. As a result, the braking force becomes stronger. On the other hand, the surface of new brake pads is relatively smooth, and the contact surface with the brake disc is smaller, which leads to a reduction in braking force. Consequently, the braking distance becomes longer with new brake pads.

To achieve the best braking effect after replacing new brake pads, a period of running-in is required. Here is a recommended method for running-in the brake pads:

1. Once the installation of new brake pads is completed, find a location with good road conditions and few cars to begin the running-in process.

2. Accelerate the car to a speed of 60 km/h.

3. Lightly step on the brake pedal to reduce the speed to a range of 10-20 km/h.

4. Release the brake pedals, and then drive for a few kilometers to allow the brake discs and brake pads to cool down.

5. Repeat steps 2 to 4 at least 10 times.

The running-in method for new brake pads involves using the technique of stepping and point braking as much as possible. It is advisable to avoid sudden braking before the running-in process is completed. It is essential to drive carefully during the running-in period to prevent accidents.

By following these steps for running-in new brake pads, the contact surface between the brake pads and brake discs will increase gradually, leading to improved braking performance and reduced braking distance over time. It is crucial to give the new brake pads time to adapt and optimize their performance. Ensuring proper brake pad break-in will contribute ultimately to the overall safety and effectiveness of the vehicle's braking system.