Motorcycle front brake caliper shaking is caused by the fact that the diameter of the fixed pin is smaller than that of the sleeve. Here are some solutions to the brake caliper shaking:

Wrap with tape:

To increase the diameter of the fixed pin, it can be wrapped with a strip of transparent tape, and then inserted into the sleeve. The number of wraps can be determined according to the size of the sleeve gap.

Apply lubricant:

Lubricate the fixed pin with butter to increase its overall diameter and make the gap between the fixed pin and sleeve as small as possible. However, over time, it may cause some looseness.

The following are some reasons why the front brake caliper may shake:

1. The diameter of the fixed pin is too small, which causes it to be too tight to fit into the sleeve.

2. The fixed pin is not properly aligned with the sleeve, which can cause it to move around.

3. The brake pads are worn out or have debris in them, which can cause the caliper to shake.

4. The caliper itself may be damaged or broken, which can also cause it to shake.

To prevent the front brake caliper from shaking, it is important to regularly maintain the brake system, including cleaning and lubricating the caliper, pads, and other components. If the caliper is still shaking after maintenance, it may be necessary to replace the caliper or other components.