Why Do Small Car Brake Pads Get Hot?
2 Answers
Here are the reasons why small car brake pads get hot: 1. Internal reason: The heating of brake pads is due to the work done by the brake pads to overcome friction, which increases the internal energy and temperature of the brake pads. This is a way to change the internal energy of an object through work. The braking process converts the mechanical energy of the moving vehicle into heat energy through friction. 2. External reason: Frequent braking causes the brake pads to heat up due to friction, which reduces the strength, stiffness, and hardness of the brake pads and increases plasticity. At higher temperatures, applying the brakes puts the brake pads under constant stress. Even if the stress is less than the yield point at that temperature, the material will slowly undergo plastic deformation. At normal temperatures, if the stress value is less than the yield strength, the deformation of the material will disappear after the force is removed. Only when the stress value is greater than the yield strength will the material undergo plastic deformation, and the deformation that occurs at this time will not disappear after the force is removed.
Brake pads getting hot is usually normal, as friction generates heat during braking. During long downhill drives, mountain roads, or continuous high-speed braking, frequent operation can cause brake pad temperatures to rise. However, excessive heating may indicate problems: if the brake pad material is of poor quality or severely worn, it can easily absorb too much heat; a stuck brake system or insufficient lubrication can also lead to poor heat dissipation, resulting in constant overheating. Once I encountered this issue on the highway and found that the brake disc wasn't fully releasing. If not addressed promptly, heat buildup can reduce braking effectiveness and even risk failure. It's advisable to park and let the brakes cool down, then visit a repair shop as soon as possible to inspect the entire brake system. While driving, try to avoid prolonged hard braking, especially when carrying heavy loads. Regular maintenance can effectively prevent issues, such as checking brake pad thickness and return springs.
