Material Classification and Performance Evaluation of Automotive Brake Pads
Currently, mainstream brake pads on the market are mainly divided into three categories based on material differences. Each type has distinct focuses in terms of performance, application scenarios, and cost-effectiveness. Car owners can make precise choices based on their vehicle type, driving habits, and budget:
I. Resin-based Brake Pads (Organic Brake Pads)
1. Material Composition
Made with high-molecular resin as the core adhesive, mixed with reinforcing materials such as glass fiber, carbon fiber, and mineral fiber, and supplemented with friction modifiers (e.g., graphite, sulfides) and fillers. They contain no or an extremely small amount of metal components.
2. Core Advantages and Disadvantages
Advantages:
Stable braking force output with linear pedal feel during braking, without "jerking";
Extremely low noise during friction, almost no harsh squealing, suitable for household scenarios where quietness is a priority;
Minimal wear on brake discs, extending the service life of brake discs (usually matching the brake disc for 3-4 replacement cycles);
Excellent low-temperature performance: under 0-100℃ (e.g., cold starts in winter), the friction coefficient remains stable, ensuring quick braking response.
Disadvantages:
Weak high-temperature stability: during continuous high-intensity braking (e.g., long downhill sections in mountainous areas, frequent emergency braking on highways), "thermal fade" is likely to occur, and the friction coefficient may decrease by 20%-30%;
Relatively short service life: under frequent start-stop scenarios in urban roads, they typically last 30,000-50,000 kilometers.
3. Application Scenarios
Most suitable for ordinary family cars (e.g., compact cars, mid-sized cars), especially for car owners who mainly commute in cities, drive 10,000-20,000 kilometers annually, and prioritize comfort and low maintenance costs.
II. Semi-metallic Brake Pads
1. Material Composition
Based on the resin matrix, 20%-60% metal particles (e.g., copper powder, iron powder, steel fibers) are added. The metal components mainly serve to enhance friction performance and high-temperature resistance.
2. Core Advantages and Disadvantages
Advantages:
Strong friction performance: the friction coefficient at room temperature is 10%-15% higher than that of resin-based brake pads, providing more powerful braking force;
Significantly improved high-temperature stability: can withstand 350-400℃, with thermal fade amplitude less than 15% during continuous braking, suitable for complex road conditions such as mountain roads and highways;
Long service life: under normal use, they can last 40,000-60,000 kilometers, with better durability than resin-based brake pads.
Disadvantages:
Metal particles increase wear on brake discs, which may cause slight scratches on brake discs after long-term use;
Slight "squeaking" noise may occur during low-speed braking (e.g., following cars in congested sections);
Slightly weak initial low-temperature braking force: during cold starts in winter, the brake pedal feels soft for the first 1-2 times.
3. Application Scenarios
Suitable for vehicles with heavy bodies such as SUVs, MPVs, and light trucks. Also ideal for car owners who frequently drive on highways or mountain roads, travel 20,000-30,000 kilometers annually, and have high requirements for braking force and durability.
III. Ceramic Brake Pads
1. Material Composition
Mainly made of ceramic fibers and ceramic powders (e.g., aluminum oxide, silicon dioxide), combined with a small amount of resin adhesive and high-performance friction modifiers, with no metal components.
2. Core Advantages and Disadvantages
Advantages:
Outstanding high-temperature resistance: can withstand temperatures above 600℃, maintaining a stable friction coefficient even under extreme conditions (e.g., intense driving on race tracks), with almost no thermal fade;
Fast and linear braking response: consistent pedal feel in both normal and high-temperature environments, suitable for scenarios requiring high braking precision;
No noise and no dust: no metal squealing during friction, and the wheel hub is less likely to be stained with black dust after braking, ensuring good cleanliness;
Minimal wear on brake discs: the hardness of ceramic material matches well with brake discs, significantly extending the overall service life of brake discs and brake pads, which usually last 60,000-80,000 kilometers under normal use.
Disadvantages:
High price: usually 2-3 times that of resin-based brake pads, resulting in higher maintenance costs;
Slightly inferior initial low-temperature braking force compared to resin-based brake pads: during cold starts in winter, it takes 1-2 brake applications to reach optimal performance;
High requirements for brake system compatibility: some old vehicle models may have compatibility issues, requiring the selection of vehicle-specific models.
3. Application Scenarios
Suitable for high-end cars and performance vehicles (e.g., sports cars, sporty sedans). They are also a good choice for car owners who have high requirements for braking performance, quietness, and cleanliness, and have sufficient budgets (with a budget of 500-1,000 yuan or more for a set of brake pads). Additionally, they are suitable for new energy vehicles (as they can reduce the maintenance frequency of the brake system and match the energy recovery system).
