What are the common problems with brake pads?
How does the coefficient of friction affect the brakes?
The friction coefficient of the brake pads is so low or so high that it will affect the braking performance of the car. Especially when the car needs to brake urgently while walking on the highway, if the friction coefficient is so high, the braking will not be sharp, so if the friction coefficient is so low, the tire locking phenomenon will occur, which will lead to the vehicle tail drift and tire blowout. Driving safety constitutes a serious threat. According to the national standard, the suitable working temperature of the friction plate is 100～350℃. However, when the temperature of many inferior friction linings reaches 250 °C, the friction coefficient will drop sharply, so the brakes will fail completely at this time. Generally speaking, according to the SAE standard, the friction plate manufacturers will use the FF rated coefficient, that is, the friction rated coefficient is 0.35 to 0.45.
What is the relationship between the life of the friction plate and the hardness?
The life of the friction plate is not related to the surface hardness. However, if the surface hardness is high, the specific contact area between the friction plate and the brake disc is large, which often affects the service life. Therefore, the main factors affecting the life of the friction plate include hardness, strength, and wear of the friction material. Under normal circumstances, the life of the front friction plate is 30,000 km, and the life of the rear friction plate is 120,000 km.
Why does it shake when braking?
It is often caused by the deformation of the friction plate or the brake disc, which is related to the material, machining accuracy and heating deformation of the friction plate and the brake disc. Less roundness, non-uniform damage of friction plates, thermal deformation and hot spots, etc. In addition, the deformation or improper installation of the brake calipers, and the friction coefficient of the friction pads are not stable, which will also cause vibration during braking. In addition, if the vibration frequency caused by the friction plate during braking and the suspension system cause resonance, it will also cause jitter.
