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Analysis: Due to the mechanical stress caused by the misalignment of the center of the brake disc during the assembly of the brake disc, the brake caliper and the brake disc are assembled or positioned incorrectly, resulting in continuous asymmetry in the wear of the brake surface on both sides of the brake disc, causing the small end of the brake disc to tear from the inner surface of the brake disc.

Solution: Thoroughly inspect the brake system and its associated components.Replace all faulty parts, install new brake discs, and imprison the brake discs in accordance with the manufacturer's recommended tightening torque and sequence.Before installing the brake disc, please check the assembly position of the brake caliper body on the axle.

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Analysis: When installing the brake disc, dirt on the surface of the wheel hub will cause the installation position of the brake disc to deviate, resulting in irregular contact between the brake pad and the surface of the brake disc, and the brake disc will wear unevenly.

Solution: Remove the brake disc and carefully clean the dirt or rust on the surface of the wheel hub and brake disc.Check the surface of the hub for deformation or other damage.Replace and fasten the brake discs in accordance with the manufacturer's recommended tightening torque and sequence.

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Analysis: The fastening sequence of the brake discs is inaccurate, and the fastening torque used is not enough.

Solution: Replace the brake discs, use the correct installation sequence and tighten them in accordance with the torque requirements recommended by the manufacturer.

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Analysis: The brake caliper is stuck.The brake pads on one side rub against the brake discs one after another, causing the brake pads to wear to the metal back plate.The side where the metal backplane rubs against the brake disc will be severely scratched, and the other side of the brake disc and the brake pads are almost in a brand new state.

Solution: Check, replace or repair the brake calipers.If necessary, the brake pads and brake discs need to be replaced.

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Analysis: The fastening torque used by the positioning screw is too large.

Solution: Replace the brake discs and avoid using excessive tightening torque.The positioning screw is only used for brake disc positioning.

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Analysis: Excessive wear of brake pads and brake discs may cause the back plate to move in the brake caliper.If this is the case, then the back plate of the worn brake pad has actually loosened in the bracket (located inside the brake caliper), resulting in a groove at the junction of the small end of the brake disc and the brake surface.

Solution: Please replace the brake discs and brake pads.Check the brake calipers and, if necessary, repair the brake calipers.