Comprehensive Analysis of Brake Pad Industry Knowledge: Quality, Selection, and Development
Among the numerous components of a car, brake pads are one of the core parts ensuring driving safety. Their performance directly affects the vehicle's braking effect and the lives of drivers and passengers. Today, we delve into the relevant knowledge of the brake pad industry to provide references for everyone in purchasing and using cars.
I. Working Principle and Structure of Brake Pads
Brake pads, also known as brake linings, are friction materials fixed on the brake drums or discs that rotate with the wheels. When the vehicle brakes, the brake calipers exert pressure on the brake pads, making them closely contact the brake discs or drums. Through friction, the rotation speed of the wheels is reduced, thereby achieving vehicle deceleration or stopping. They are generally composed of a steel plate, a bonded heat-insulating layer, and a friction block. The steel plate serves as the basic structure to provide support; the bonded heat-insulating layer can effectively block the heat generated during braking, preventing heat from transferring to other parts of the braking system; the friction block is the part that directly generates friction, and its material and performance play a key role in the overall performance of the brake pad.
II. Classification and Characteristics of Brake Pads
(I) Classification by Material
1. Asbestos brake pads: Once widely used, asbestos fibers have high strength and heat resistance, which can meet the basic requirements of brake pads, and the cost is low. However, because asbestos is a carcinogen, it is extremely harmful to human health, and its thermal conductivity is poor, which easily leads to brake failure, so it has been basically eliminated.
2. Semi-metallic brake pads: Use steel wool and other materials as reinforcing fibers and mixtures, with high metal content and high strength. Their advantages are good temperature control ability and high braking temperature, which can help the brake discs and drums dissipate heat; the disadvantages are that high braking pressure is required at low temperatures, which easily causes wear on the surface of brake discs or drums, produces loud noise, and may also lead to brake fluid problems and aging of brake components.
3. Non-asbestos organic (NAO) brake pads: Use glass fibers, aromatic polyacid fiber esters and other fibers as reinforcing materials, and their performance is closer to that of asbestos brake pads. After innovation, they surpass asbestos brake pads in terms of anti-friction performance and noise control, have a longer service life, and are beneficial to extending the life of brake drums and discs. However, their thermal conductivity and high-temperature controllability are not as good as semi-metallic brake pads.
4. Ceramic brake pads: Composed of ceramic fibers, iron-free filler substances, adhesives, and a small amount of metal. They have the advantages of high temperature resistance, no noise, no dust, no corrosion to wheel hubs, long service life, and environmental protection. They are widely used in the Japanese and North American automobile markets, and new European models have also begun to be equipped with them. Although the price is relatively high, with the development of cars towards high performance, safety, and comfort, they are an important development trend in the future. Shandong Huaruifeng Machinery Co., Ltd. has a rich product series including ceramic brake pads to meet the needs of different customers.
(II) Classification by Brake Type
1. Disc brake pads: Mostly used in cars and some light vehicles, with sensitive braking, fast heat dissipation, and can adapt to frequent braking.
2. Drum brake shoes: Common in some trucks, buses, and some old models, with simple structure and low cost, but their heat dissipation performance is relatively poor, and the braking efficiency will decrease with use time.
3. Truck brake linings: Designed for the heavy load and high load braking needs of large trucks, with higher wear resistance and anti-thermal recession performance.
III. Key Performance Indicators of Brake Pads
1. Friction coefficient: A key factor determining the braking force and braking effect. The national regulation requires that the friction coefficient should be between 0.3 and 0.7 at 100℃, and the friction coefficient of brake pads for ordinary vehicles is generally between 0.28 and 0.40. When choosing, try to be consistent with or slightly larger than the original factory of the vehicle. If you want to improve the braking force, you can consider products with a higher friction coefficient, but an excessively high one may easily cause dangers such as wheel locking and loss of direction control.
2. High-temperature resistance: High temperature will be generated during braking, and high-temperature resistance is related to the safety of the braking system. At 200℃, the friction coefficient should not be lower than 0.2; otherwise, it will affect braking safety. Poor-quality brake pads may have a decrease in friction coefficient or even brake collapse at high temperatures.
3. Wear resistance: Closely related to the manufacturing material and process. Brake pads with good wear resistance have a long service life, such as brake pads made of new ceramic materials, which perform well in this aspect.
4. Physical strength: Need to withstand pressure and shear force during processing and use to ensure normal operation under various working conditions.
5. Fit degree: New brake pads should be well run-in with the brake discs without gaps; otherwise, problems such as jitter and abnormal noise may occur, affecting the driving experience and driving safety.
6. Comfort: Including braking feel, noise, dust, smoke, odor, etc. Comfortable brake pads can improve the driving experience.
IV. How to Choose High-quality Brake Pads
1. Look at the brand and enterprise strength: Choose well-known brands, which have better quality and after-sales guarantees. Enterprise strength is also crucial; brands with good sales volume often have high cost performance, which can be evaluated by checking brand reputation, market share, etc. Like Shandong Huaruifeng Machinery Co., Ltd., relying on years of industry experience, advanced technology, and strict quality control, it has established a good reputation in the market.
2. Pay attention to product parameters: Refer to the above key performance indicators, and choose suitable brake pads according to your vehicle model, driving habits, and road conditions. For example, if you often drive in urban congested road conditions, higher requirements are put forward for the wear resistance and comfort of brake pads; if you often drive on highways, you pay more attention to high-temperature resistance and braking stability.
3. Check product details: High-quality brake pads have good handling of details, with exquisite packaging, clear logos, flat surfaces without defects, and uniform distribution of friction materials.
4. Choose regular channels for purchase: It is recommended to buy from 4S stores, authorized dealers, or regular e-commerce platforms to avoid buying counterfeit and shoddy products. Counterfeit and inferior brake pads not only have poor braking performance but may also cause serious consequences such as wheel locking, loss of direction control, and extended braking distance.
V. Development Trends of the Brake Pad Industry
1. Technological innovation promotes product upgrading: With the development of automobile technology, the performance requirements for brake pads are constantly improving, prompting enterprises to increase R&D investment, develop new materials and manufacturing processes, such as carbon/carbon composite brake materials and warm compaction forming processes, to improve the comprehensive performance of brake pads.
2. Green environmental protection becomes the mainstream: Consumers' awareness of environmental protection is increasing, and the demand for pollution-free and low-noise brake pads is growing. The market share of environmentally friendly products such as ceramic brake pads will gradually expand.
3. Development of intelligence and customization: In the future, brake pads may incorporate intelligent sensors to monitor wear and performance status in real-time, providing car owners with more accurate maintenance prompts; at the same time, customized production according to different vehicle models and user needs will become a trend.
Although brake pads are small, they play an irreplaceable role in automobile safety. Understanding the industry knowledge of brake pads, choosing suitable products, and performing regular maintenance are the keys to ensuring driving safety and extending the service life of the vehicle. It is hoped that everyone can pay attention to the role of brake pads and travel safely.
