Brake squeal is a common and annoying problem that can affect any vehicle. It is caused by the vibration of the brake pads and rotors when they come into contact with each other. The vibration produces a high-pitched noise that can be heard on a bike.

There are several possible causes of brake squeals, such as:

- Worn or damaged brake pads or rotors
- Glazed or contaminated brake pads or rotors
- Loose or misaligned brake components
- Lack of lubrication on the brake calipers or hardware
- Improper installation of brake pads or rotors

Fortunately, there are some ways to stop or reduce brake squeals, depending on the cause and severity of the problem.
Here are some tips to try:

- Replace your brake pads and rotors if they are worn or damaged. You can check the thickness of your brake pads by looking at them through the wheel spokes. If they are less than 1/4 inch thick, they need to be replaced. You can also check the condition of your rotors by feeling them with your fingers. If they are rough, grooved, warped, or cracked, they need to be replaced.
- Clean your brake pads and rotors if they are glazed or contaminated. Glazing occurs when the brake pads overheat and form a shiny layer on their surface. Contamination occurs when the brake pads or rotors get exposed to oil, grease, dirt, water, or other substances. You can clean your brake pads and rotors by using a brake cleaner spray and a wire brush. Make sure to wear gloves and eye protection when doing this.
- Tighten or adjust your brake components if they are loose or misaligned. Loose or misaligned brake components can cause the brake pads and rotors to rub against each other unevenly, creating vibration and noise. You can tighten or adjust your brake components by following the instructions in your vehicle’s manual or consulting a professional mechanic.
- Lubricate your brake calipers and hardware if they are dry or rusty. Lubrication helps to reduce friction and noise between the moving parts of the brake system. You can lubricate your brake calipers and hardware by using a high-temperature grease or anti-squeal compound. Apply a thin layer of lubricant on the back of the brake pads, the contact points of the calipers, and the pins and clips of the hardware. Do not apply lubricant on the friction surface of the brake pads or rotors.
- Install your brake pads and rotors properly if they are new or replaced. Improper installation of brake pads and rotors can cause them to vibrate and squeal. You can install your brake pads and rotors properly by following the instructions in your vehicle’s manual or consulting a professional mechanic. Make sure to use the right type and size of brake pads and rotors for your vehicle. Also, make sure to break in your new brake pads and rotors by driving gently for the first few hundred miles.

Brake squeal is not only annoying but also potentially dangerous. It can indicate a problem with your brake system that can affect your braking performance and safety. Therefore, it is important to stop or reduce brake squeals as soon as possible by following these tips or seeking professional help.