What makes brake pads sound strange?

What makes brake pads sound strange?
The strange noise from the brake discs is a headache.
Firstly, you must distinguish between abnormal sounds, whether they are screams, deep sounds, or shouting,
If the brake pads are screaming, the first thing to check is whether the brake pads are used up (the alarm pad sounds). If it is new, check if there are any foreign objects between the brake disc and the brake disc.
If the brake is silent, it is mainly a problem with the brake caliper, such as wear on the moving pin, spring detachment, etc.
If it's the so-called brake pads, then there may be more problems with the calipers, brake discs, and brake pads. If the noise is continuous, the first thing to check is whether there is a resistance brake. Poor resetting of the caliper can cause long-term friction between the disc and the workpiece, and under certain conditions, abnormal noise can occur. Check for foreign objects between the film and disc. If it is a new type of film, it depends on whether the brake disc has grooves, as local friction can cause abnormal noise. If there is no problem with the valve disc, please consider whether the brake pads are too hard or whether the muffler is improperly installed. If it sounds when braking, it's too difficult.
In short, the brake disc is a caliper, and the brake disc is jointly completed, both of which produce abnormal noise. But people often attribute the problem to the brake discs.
The brake pads are excessively worn and made of hard material.
The main material of brake pads is semi metal. As the name suggests, semi metal brake pads contain a large amount of metal fibers. The brake disc is made of pearlescent iron, with metal rubbing against metal. There may be noise. It is recommended to use NaO formula brake pads, organic alkali free gold apartment iron free brake pads, or high-end NaO ceramic formula: not all semi metal brake pads will make noise, but the possibility of semi metal brake pads making noise is now recognized.
There are foreign objects between the brake pads, such as sand, iron tiles, etc. When it is adsorbed by external forces (wind, frictional static electricity) during driving, it will stick to the brake pads or discs, producing noise during braking. At this point, it is recommended to clean the brake pads and discs. Brake noise is not related to uneven braking or valve discs.
If the brake pads rub against the position of the alarm, the alarm bell will sound, but the driver should be aware of assembly issues such as spacing, loose nuts, etc. Go to the garage and have the repairman debug!
The noise of the brake disc is closely related to temperature, which is closely related to whether the formula of the brake pad is resistant to high temperatures. Some brake discs do not exhibit abnormal noise at room temperature, but exhibit abnormal noise after frequent brake temperature increases. That is to say, the temperature and noise resistance of brake materials in the raw materials are small or no!
Ceramic brake pads are not just ceramic fiber brakes, they can be called ceramic brake pads. It is a standard for performance, data, various materials, and materials, not included. of
Professional brake pad Test effort has many reasons for brake pad noise.
Due to the similarity between the stiffness of the brake pads and the stiffness of the brake discs, resonance is easily generated, and sound is generated by vibration. There is a granular hard object on the surface of the brake pad, which causes a scream when it is scratched with the brake disc.