If your Honda CB Hornet is making noise specifically from the front disc brake at very low speeds, there could be a few potential reasons for this:
Brake Pad Vibration: One possible cause of noise could be vibration between the brake pads and the brake rotor. This can occur when the brake pads are not properly seated or if there is excessive movement or play in the brake components. Ensure that the brake pads are properly installed, aligned, and in good condition. If there is excessive wear or damage to the brake pads, they may need to be replaced.
Brake Caliper Issues: Another possibility is that there may be an issue with the brake caliper. The caliper could be misaligned or sticking, causing the brake pads to make contact with the rotor unevenly. This can result in noise and vibration. Inspect the brake caliper for any signs of damage or misalignment. If necessary, the caliper may need to be adjusted or replaced.
Rotor Issues: A worn or warped brake rotor can also lead to noise and vibration. Over time, the brake rotor may develop uneven wear or become warped due to heat and stress. Inspect the brake rotor for signs of excessive wear or warping. If necessary, the rotor may need to be resurfaced or replaced.
Lubrication: In some cases, insufficient lubrication between the brake components can cause noise and friction. Ensure that the brake components, including the caliper pins and slides, are properly lubricated with brake-specific lubricant.
If you are unsure about diagnosing or resolving the issue yourself, it is recommended to have the bike inspected by a qualified mechanic or visit a Honda authorized service center. They can thoroughly inspect the brake system, identify the specific cause of the noise, and perform any necessary repairs or adjustments to ensure proper operation and safety.