Automotive Brake Pads: Professional Industry Knowledge
1. Introduction to Brake Pads
Brake pads are the core safety components of the vehicle braking system, also known as brake linings. They are installed on the brake calipers and directly contact the brake discs or brake drums to generate friction, converting kinetic energy into heat energy to achieve vehicle deceleration and parking. As the most consumed part in the braking system, their performance directly determines driving safety.
2. Classification by Friction Material
(1) Semi-metallic Brake Pads
Semi-metallic pads are the most widely used traditional type, composed of steel fibers, iron powder, graphite and resin. They feature high strength, good heat resistance and low cost, suitable for ordinary passenger cars and commercial vehicles. However, they produce large amounts of dust, are noisy at low temperatures and wear brake discs faster.
(2) Non-asbestos Organic (NAO) Brake Pads
NAO pads use organic fibers instead of asbestos and metal materials. They are quiet, low-dust, gentle to brake discs and comfortable to brake. They are commonly used in economy cars and urban vehicles, but have poor high-temperature resistance and shorter service life under heavy load.
(3) Ceramic Brake Pads
Ceramic brake pads represent the mainstream of high-end technology, made of ceramic fibers, non-ferrous fillers and high-temperature resins. They feature stable friction coefficient, ultra-low dust, low noise, high heat resistance and long service life, which are 3–5 times longer than semi-metallic pads. They are widely used in new energy vehicles, high-end passenger cars and performance models.
(4) Carbon-Ceramic Composite (C/SiC) Brake Pads
Carbon-ceramic is the top-level braking material, with ultra-high temperature resistance (above 1600°C), light weight and excellent fade resistance. It is mainly used in supercars, high-performance new energy vehicles and racing cars. Although the cost is high, its performance and lifespan are far beyond traditional materials.
3. Core Performance Indicators
• Friction Coefficient: The key index affecting braking force. A stable coefficient ensures consistent braking feel.
• Heat Fade Resistance: The ability to maintain braking efficiency under continuous high temperature.
• Wear Rate: Directly determines service life and replacement cycle.
• Noise & Dust: Related to driving comfort and vehicle appearance.
• Cold Braking Performance: Braking efficiency at low temperatures, related to driving safety in cold conditions.
• Compliance Standards: Mainly including GB 5763, ECE R90, SAE J661 and other safety certifications.
4. Application Differences Between Fuel Vehicles and New Energy Vehicles
New energy vehicles are heavier and rely on frequent energy recovery, putting forward higher requirements for brake pads:
• Low drag design to reduce energy loss and improve range
• Higher thermal stability to resist frequent braking
• Low dust and low noise to improve user experience
• Longer service life to reduce maintenance frequency
Therefore, ceramic and copper-free formulas have become the first choice for new energy vehicles.
5. Environmental Protection and Industry Trends
With the upgrade of global environmental regulations, the brake pad industry is moving towards:
• Copper-free & Low-copper: Copper content below 0.5% has become an international standard.
• Non-toxic & Pollution-free: Banning asbestos, lead, cadmium and other harmful substances.
• Low-carbon & Lightweight: Reducing carbon footprint and vehicle energy consumption.
• Intelligent & Customized: Developing special formulas for NEVs, commercial vehicles and high-performance cars.
6. Replacement and Maintenance Tips
• Replacement cycle: Generally 30,000–60,000 km for normal driving; ceramic pads can last 60,000–100,000 km.
• Warning signs: Abnormal noise, soft brake pedal, longer braking distance, visible wear on pads.
• Selection principle: Give priority to certified products; do not use cheap unqualified brake pads.
7. Summary
Brake pads are small in size but related to life safety. With the development of automotive intelligence and electrification, the industry is moving towards high performance, environmental protection, long life and customization. High-quality brake pads have become an important guarantee for modern vehicle safety and comfort.
