Core Knowledge of the Brake Pad Industry: A Comprehensive Analysis from Technological Trends to Selection and Maintenance

As the core safety-critical component of a vehicle's braking system, the performance of brake pads directly determines driving safety. With the electrification and intelligent transformation of the automotive industry, the sector is undergoing a comprehensive upgrade in materials, craftsmanship, and functionality. Below is a detailed breakdown of key information about the brake pad industry from the perspective of core knowledge:

I. Core Composition and Working Principle of Brake Pads

• Basic Structure: Composed of steel plates (treated with anti-rust coating), heat insulation layers (to block high-temperature transfer), and friction blocks (the core braking components). The friction blocks contain friction materials and binders, which are crucial for achieving deceleration and braking.

• Working Principle: The brake caliper pistons exert force to generate friction between the friction blocks and brake discs (or brake drums), converting the vehicle's kinetic energy into thermal energy to realize deceleration or parking. It essentially follows the physical principle of friction force = friction coefficient × normal force.

• Supporting Safety System: It works in close coordination with the ABS (Anti-lock Braking System). Through high-frequency pressure regulation, it prevents tire lock-up, ensures the vehicle's steering and tracking capabilities during braking, and maximizes driving safety.

II. Mainstream Brake Pad Classifications and Application Scenarios

Classification by Structural Type

• Disc Brake Pads: Compatible with disc brake systems, featuring excellent heat dissipation, and widely used in mainstream models such as passenger cars and urban SUVs.

• Drum Brake Shoes: Compatible with drum brake systems, cost-effective, and mostly used on the rear wheels of economy vehicles.

• Truck Brake Linings: Specifically designed for heavy-duty trucks, with thicker friction linings capable of withstanding high loads and continuous braking under high temperatures.

Classification by Material Formula

• Ceramic-based Brake Pads: The current mainstream preferred option, resistant to high temperatures (350℃-700℃), with stable friction coefficients, no noise, low dust emission, minimal wear on brake discs, and a 30% longer service life than ordinary ones. They are expanding from high-end models to mid-range vehicles.

• Semi-metallic Brake Pads: Containing 30%-65% metal fibers, they boast high friction coefficients, fast heat dissipation, and outstanding cost-effectiveness. However, they tend to produce abnormal noise and dust, making them suitable for vehicles frequently driven on highways.

• Low-metallic Brake Pads: With metal content below 20%, their performance falls between ceramic and semi-metallic brake pads. They are affordable and ideal for daily commuters with limited budgets.

• Special Material Brake Pads: For example, carbon/carbon composite brake pads can resist temperatures up to 3000℃ and are suitable for aerospace and supercar racing scenarios; NAO (Non-Asbestos Organic) formula brake pads are eco-friendly with low wear, and compatible with Japanese models.

III. Three Core Trends in Industry Technological Development

1. Material Environmental-friendliness and Customization: Low-metallic/non-metallic materials have become R&D hotspots. Natural mineral fibers and plant fibers are used to replace synthetic fibers, reducing heavy metal and harmful dust emissions. Tailor-made formulas with specific friction coefficients and temperature characteristics are developed for different vehicle types, including fuel-powered cars, hybrid/electric vehicles.

2. Structural and Craftsmanship Upgrading: Optimize the design of heat dissipation grooves and adopt lightweight backplates to reduce the vehicle's unsprung mass. Precision molding and automated production are implemented to enhance product consistency and performance stability.

3. Intelligent Integration: Integrate wear sensors and temperature sensors to monitor the thickness and working status of brake pads in real time, enabling service life early warning. It collaborates closely with brake-by-wire and ESP systems, becoming a core executive component for high-level autonomous driving.

IV. Key Guidelines for Selection and Replacement

Core Selection Parameters

• Model Specifications: Must match the vehicle's brake caliper type (single/multi-piston), brake disc size, and metal backplate hole positions. Provide the "vehicle model year + displacement + drive mode" or the original brake pad model to avoid performance degradation caused by choosing "universal models".

• Friction Coefficient: Choose 0.35-0.45 (GG/FF class) for household passenger cars, and 0.40-0.50 (HH class) for SUVs/MPVs. Avoid blindly pursuing ultra-high friction coefficients (e.g., racing-grade JJ class) or selecting products with excessively low coefficients (e.g., EE class).

• Quality Identification: High-quality brake pads feature neat workmanship, firm adhesion between friction materials and backplates, no bubbles, no rust, and no pungent odor. Prioritize products with brand guarantees and 1-2 year warranty.

Judgment of Replacement Timing

• Abnormal Noise Warning: A squeaking metal friction sound during braking indicates that the wear warning plate is triggered, and only 3-5mm of friction material remains.

• Performance Degradation: A soft brake pedal or significantly extended braking distance requires immediate inspection and replacement.

• Thickness and Mileage: Brake pads must be replaced when the friction material is less than 3mm (about half the thickness of a coin). For ordinary household cars, replacement is recommended every 20,000-30,000 km; for urban commuting with frequent braking, the interval can be shortened to 15,000-20,000 km, with a maximum limit of 40,000 km.

V. Core Industry Precautions

• Safety Bottom Line: Asbestos-containing brake pads have been banned globally due to their carcinogenicity. Always check for the "asbestos-free" label when purchasing.

• Maintenance Tips: Brake fluid should be replaced annually, and mixing different types of brake fluid should be avoided. Regularly inspect the flatness of brake discs to prevent abnormal braking noise or imbalance caused by surface grooves.

• Compatibility Principle: Electric vehicles and hybrid vehicles, due to their special self-weight and braking characteristics, require customized brake pads. Avoid using universal brake pads for fuel-powered vehicles to prevent compromising braking efficiency and service life.

Shandong Huaruifeng Machinery Co., Ltd. has deeply rooted in the brake pad industry, keeping pace with technological trends. We provide high-quality products suitable for various vehicle types and scenarios, ranging from ceramic-based composite materials to customized formulas, comprehensively safeguarding driving safety.