Answer: First, the brakes will wear out after a certain period of use. The contact surface between the brake disc and the brake pad will have many grooves or hard spots due to overheating, forming a groove in the contact surface of the brake disc and the groove peak of the chip in close contact with the groove at the same time. The ditch peak of the plate is in close contact. At this point, the contact area between the two has been kept at a maximum, which means that the braking force at this time is kept at the maximum, in line with the original design requirements.
When a new brake pad is replaced, the contact surface between the brake pad and the brake disc is relatively flat, and the contact surface on the brake disc is very uneven. Then, something like "a piece of soap on the washboard" will appear. The phenomenon. The contact area between them is very small, and when the brakes are applied, the deformation of the brake pads is very large. It's like using a lot of pressure soap, because the washboard's ribs are very hard, so that the soap contact surface deformation. The direct phenomenon would be: When the brakes are applied, the pedals are low and soft, and obviously the braking force is not enough.
Solution: Replace or buff the brake disc each time you change the disc. For safety, remember that when the brake disc is used to a certain limit, it must be replaced.
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