The brake pad is composed of a friction material layer, a heat insulation layer, an adhesive layer, a back plate and the like. The brake pad pushes the back plate through the brake cylinder to press the friction material of the brake pad on the brake disc to brake, so the quality of the friction plate is particularly important. Some brake pad friction plates have poor hard braking effect but long service life. Some brake pads have softer friction materials but good braking performance. From this point, it can be seen that the life of the brake pads is directly related to the quality of the friction materials.
A new brake pad thickness is generally around 1.5cm, which will gradually become thinner as the friction is constant during use. Professional technicians suggest that when the thickness of the brake pads is only about 1/3 of the original thickness (about 0.5 cm), the owner will increase the self-test frequency and be ready to replace it. Of course, due to the design of the wheel hub, individual models do not have the conditions for visual inspection, and it is necessary to disassemble the tires to complete. Each brake pad has a raised mark on both sides. The thickness of this mark is about two or three millimeters. This is also the limit for the thin replacement of the brake disc. If the thickness of the brake pad is already parallel with this mark, it must be replaced. Therefore, when the thickness of the brake pad is close to this mark, the owner must observe and prepare at any time, but it is difficult to accurately observe it through the naked eye without disassembling the tire. At present, many models have the position of the hand brake lamp when the brake pad is too thin. Prompt, relative self-test is more convenient. Small suggestion: The brake pads are not strictly replaced according to the car environment and driving habits. Generally, it is necessary to consider replacing them after driving about 60,000 kilometers. When the naked eye observes that the brake pads are thin, they should be inspected by technicians during maintenance. Because there is an error in the visual inspection, the professional service station is more rigorous than the naked eye through the caliper.