Ultimate Guide to Brake Pad Selection and Usage: A Comprehensive Analysis from Material, Certification to Replacement

As the core executive component of the automotive braking system, brake pads directly determine the safety threshold of driving. Accurate control over material selection, compliance certification, and replacement timing is the key to ensuring braking performance. With years of experience in the brake pad industry, Shandong Huaruifeng Machinery Co., Ltd. sorts out the core knowledge system of brake pads by integrating industry technological trends and market demands, helping global customers achieve scientific selection and safe usage.

I. Material Evolution: Precise Adaptation for Different Scenarios

Brake pad materials have undergone multiple generations of evolution. Currently, mainstream types have their own characteristics and need to be selected according to vehicle models, road conditions and usage requirements:

• Semi-metallic materials: With a metal content of 30%-65%, they feature excellent high-temperature resistance and low cost (about $42-70 per set). They have high thermal conductivity, making them suitable for commercial trucks, heavy-duty vehicles and scenarios with frequent high-speed braking. However, they have a relatively high incidence of low-temperature abnormal noise and tend to accelerate brake disc wear.

• Low-metallic materials: Containing 15%-30% metal, they have a stable friction coefficient ranging from 0.38 to 0.42 and a heat dissipation efficiency of 50 W/m·K. They offer better braking comfort than semi-metallic formulations, making them a cost-effective choice for heavy-duty household vehicles such as SUVs and MPVs.

• NAO organic materials: Based on organic fibers and resin binders, they have a short running-in period (about 200km) and produce brake noise below 65 decibels, causing minimal wear to brake discs. They are suitable for Japanese household vehicles that require frequent braking during urban commuting.

• Ceramic materials: The mainstream choice in the high-end household vehicle market, they can operate at temperatures up to 800℃ with excellent resistance to thermal fade. They are quiet, low-dust and have a long service life. Although their manufacturing cost is 2-3 times that of ordinary materials, they perfectly meet the needs of household vehicle owners pursuing comfort and environmental protection.

• Carbon-ceramic composite materials: A top-tier high-performance material, with a density only 40% that of steel and a high-temperature resistance limit of 1200℃, they have a service life of over 100,000km. They are suitable for top-of-the-line supercars and professional racing vehicles, with a price of over $1,400 per set.

• New energy vehicle (NEV)-specific materials: Developed to address the heavy battery weight and regenerative braking systems of electric vehicles, they adopt low-noise and low-dust formulations. They focus on enhancing wear resistance and thermal stability to ensure efficient compatibility with regenerative braking systems and extend service life.

II. Core Indicators: Decoding the "Performance Secrets" of Brake Pads

• Friction coefficient (μ): The core metric for measuring braking efficiency, defined as the ratio of friction between brake pads and brake discs to caliper pressure. China's national standard requires it to be maintained between 0.25 and 0.70 in the temperature range of 100℃-350℃. The ideal value for ordinary household vehicles is 0.3-0.4, which can be increased to 0.4-0.5 for high-performance vehicles. Commercial heavy-duty vehicles usually choose a range of 0.35-0.42. An excessively high coefficient may lead to brake sensitivity, while an excessively low one will result in insufficient braking force.

• Temperature stability: High-quality brake pads can maintain a stable friction coefficient in the range of 200℃-650℃ to avoid "thermal fade" at high temperatures. Shandong Huaruifeng's products control the friction coefficient fluctuation within ±15% in the temperature interval of 100℃-350℃, reaching the international advanced level.

III. Compliance Certification: The "Access Pass" to Global Markets

As a safety-critical component, brake pads must pass strict certification to enter target markets. Core certification standards include:

• EU ECE R90 Certification: The world's most authoritative certification standard for brake friction components, covering passenger cars, commercial vehicles and trailers. It requires the friction performance deviation to be ≤±15% of the original factory specifications, zero asbestos content, and compliance with REACH heavy metal limits. Certified products are mutually recognized in 47 ECE member states.

• IATF 16949 Quality Management System Certification: A universal quality standard for the automotive industry, ensuring the consistency and reliability of products throughout the R&D and production processes.

• China GB5763-2008 Standard: The basic requirement for domestic market access, specifying core requirements such as friction coefficient, wear rate and environmental indicators.

Shandong Huaruifeng's core products have fully obtained the above certifications. Leveraging its compliance advantages, the company has successfully entered mainstream markets in Europe and North America in large quantities and gained widespread recognition from overseas customers.

IV. Replacement Alerts: 3 Key Signals and 4 Practical Judgment Methods

Brake pads must be replaced in a timely manner to avoid potential safety hazards. Check and replace them immediately if any of the following situations occur:

(1) Core Signals for Mandatory Replacement

1. The thickness of the friction material is worn down to 3-5mm, or is flush with the wear limit mark (small metal bump).

2. The service life exceeds 3-5 years; even if the mileage is insufficient, material aging may cause performance degradation.

3. Squealing metal friction noise during braking, soft/vibrating brake pedal, significantly longer braking distance or vehicle deviation during braking.

(2) Practical Identification Methods

1. Visual inspection: Observe through the gap of the wheel hub; replace if the friction material thickness is less than 5mm or if cracks and shedding occur.

2. Sound judgment: A continuous sharp metal friction sound indicates that the brake pad has worn down to the metal backing plate, requiring immediate replacement.

3. Feel and performance check: Replace in a timely manner if the brake pedal travel becomes longer, braking force is insufficient or the vehicle deviates during braking.

4. Professional disassembly inspection: Precisely measure the thickness with a vernier caliper, and check for scratches and deformation of the brake disc simultaneously.

V. Selection Recommendations: Efficient Matching Based on Needs

• Urban commuting household vehicles: Prioritize ceramic or NAO organic materials for quietness, low dust and comfort.

• Commercial heavy-duty/frequent high-speed braking: Recommend semi-metallic or low-metallic materials for enhanced high-temperature resistance and load-bearing capacity.

• New energy vehicles: Choose brake pads specifically designed for regenerative braking systems, focusing on wear resistance and thermal stability.

• Export to overseas markets: Ensure products pass the certifications required by the target regions (such as EU ECE R90 and relevant North American standards) to avoid compliance risks.

Shandong Huaruifeng has always taken technological innovation as its core. Tailored to the needs of different markets and vehicle models, the company has built a full-scenario brake pad product matrix. From material formula optimization to compliance certification layout, Huaruifeng provides safe, environmentally friendly and efficient braking solutions for global customers. For customized selection recommendations based on specific vehicle models or market demands, please feel free to contact our technical team at any time.