Brake Pad
Overview
Brake pads are sacrificial components in disc braking systems, pressed against rotors to generate friction. Modern pads evolved from early asbestos-based designs to advanced composite materials meeting strict safety and environmental standards. They are classified by material (ceramic, semi-metallic, organic) and vehicle application. As safety-critical parts, brake pads undergo rigorous testing for fade resistance, wear rate, and noise performance. Leading manufacturers adhere to global standards like ECE R90 (Europe) and FMVSS 135 (USA), with OEM specifications often exceeding these benchmarks.
Structure and Working Principle
A typical brake pad consists of a steel backing plate bonded to a friction material layer, often with chamfers and slots to reduce noise. The friction material contains 10–20 ingredients including abrasives (alumina), lubricants (graphite), and structural reinforcements (aramid fibers). When hydraulic pressure activates the caliper, the pad contacts the rotating rotor at 0.3–0.5 friction coefficient. This converts kinetic energy into heat (up to 700°C), requiring materials that maintain stability across temperature ranges. Ceramic pads use copper-embedded ceramic fibers for consistent performance, while semi-metallic pads employ steel wool for better heat dissipation.
Key Features
High-performance pads prioritize three characteristics: fade resistance (maintaining effectiveness when hot), modulated friction (smooth engagement), and rotor friendliness (minimizing disc wear). Ceramic pads excel in noise reduction and low dust, while semi-metallic variants offer better cold-bite performance for heavy vehicles. Advanced features include wear sensors (triggering dashboard warnings at 2–3mm remaining), thermal barrier coatings to protect calipers, and laser-etched identification codes for traceability. Some premium pads incorporate damping shims to reduce high-frequency vibrations that cause squealing.
Application Areas
Passenger cars predominantly use ceramic or low-metallic pads for quiet operation, while commercial vehicles often require semi-metallic compounds for higher load capacity. Motorsport applications employ specialized materials like carbon-ceramic composites capable of withstanding 1,000°C+ temperatures. Electric vehicles present new challenges due to regenerative braking reducing pad usage (leading to corrosion from disuse) and heavier vehicle weights. Manufacturers now develop EV-specific pads with higher initial bite to compensate for reduced hydraulic braking involvement.
Maintenance and Precautions
Pads should be inspected every 15,000–25,000 km, with replacement typically needed at 3mm remaining thickness. Improper bedding-in (40–50 moderate stops without overheating) causes glaze formation, reducing effectiveness. Contamination by brake fluid or grease necessitates immediate replacement. Technicians must clean hub surfaces before installation to ensure even contact and use torque wrenches on caliper bolts. Discard pads if the friction material separates from the backing plate or shows uneven wear patterns, which may indicate caliper issues.
B2B Procurement Guide
Bulk buyers should verify certifications like ISO 9001 and OEM approvals (e.g., Mercedes-Benz MB-Approval 362.1). Minimum order quantities typically start at 500 sets, with container-load discounts available. Key evaluation criteria include test reports for friction coefficient stability (SAE J2522) and wear rates. Leading manufacturing regions include Germany (textar, Pagid), Japan (Akimbo, Nisshinbo), and China (shandong-based exporters). For custom branding, minimum order quantities of 2,000–5,000 sets usually apply, with lead times of 45–60 days for tooling and production.
Related Manufacturers
- 主营：消防机器人、运输车、漏电探测仪、制动器、巡检机器人、消防箱、防护服、破拆工具、消防灭火装置、交通器材、传感器、电磁阀、测试仪、电动脚手架、装载机电子秤、地磅、纸管切割机、攻丝机、混凝土振动棒、打包机、电动液压冲孔机、研磨机、激光雕刻机、滑移机、洗消剂、防爆风机
- 主营：破碎锤、截桩机、液压剪、滚筒夯、挖机泥浆泵、岩石锯、铣挖机、挖机打桩机、抓钢机、筛分斗、土壤修复斗、电磁吸盘、沙滩清理机、莲花抓钢机、装载机清扫车、护栏清洗机、除雪滚刷、锚索切割机、皮带取样机、空气炮、犁式卸料器、焊网机、钻孔测斜仪、电动皮带纠偏器、坑道钻机
- 主营：气动单轨吊、电缆单轨吊、气动葫芦、气动单轨吊制动系统、水切割机、临时支护、锚索切割机、驱动轮、气动注液泵、轨道
- 主营：玻璃吸盘、刮板机、支柱、绞车、传感器、喷浆机、喷涂机、拆缸机、柴油机水泵、乳化液泵站、氢氧化钙、订扣机、液压扳手、真空泵、滑移装载机、电缆夹板、闸瓦、滤液泵、试验台、装载机、气动绞车、变压器、移动变电站
- 主营：双速绞车、钻注一体机、注浆加固钻机、电力液压鼓式制动器、运输绞车、采煤机截齿、掘进机截齿、高强度圆环链、锻打刮板、锅炉炉排减速机、耙斗装岩机、中深孔钻机、锯齿环、弧齿环、自移机尾配件、破碎机配件、刻槽钻杆、风钻杆、液压支架油缸、拨链器舌板组件、刮板机油缸、销轨、E型螺栓
- 主营：147销轨、u95齿套、7gl刮板、刹车总成、煤钻杆、54sa刮板、15gl刮板、主机刮板、42防突钻头、42防突钻杆、打孔注浆机、钻注一体机、90S刮板、113S刮板、18*64圆环链、ZLJ-350钻机、B19钻杆、28煤钻头、28金刚石钻头、B22钻杆、U94齿套、防突钻杆、U95截齿、764刮板、锻打销轨、空心煤钻杆
- 主营：离合器摩擦片、减速机摩擦片、湿式铜基摩擦片、制动器摩擦片、电机刹车片、摩擦块、刹车片、摩擦片
- 主营：滚筒机、滤油车、油滤机、pvc衬块、刹车片、磁开关、摩擦片、k25耐磨、胶垫pvc、密封圈、传感器、橡胶圈、摩擦板、抱索器、胶垫t30、衬垫t30、滤油机、压缩机、pvc天轮、发讯器、聚氨酯、负压力、提升机、卷扬机、高分子
- 主营：路开关、猴车轮、索道配、固定块、摩擦块、刹车皮、刹车片、轮衬块、密封圈、传感器、罐笼配、防挤绳、绳滑套、输送机、驱动轮、抱索器、联轴器、变压器、钢带机、连接件、导向管、液压站、发讯器、摩擦垫、提升机
- 主营：摩擦片、机械摩擦片、离合器摩擦片、摩擦块、制动器摩擦片、电机刹车片、冲床摩擦块、高性能摩擦块、机械刹车片、工业刹车片、制动摩擦片、印刷机刹车片、气动制动器刹车片、无石棉橡胶刹车带、机械磨擦片、电机摩擦片、铜基摩擦片、工业机械摩擦片、纸基摩擦片、农用机械摩擦片、工程机械摩擦片、粉末冶金铜基片、电磁离合器摩擦片
- 主营：高强螺栓检测仪、抗滑移系数检测仪、液压万能试验机、刹车片剪切试验机、电子万能试验机、卧式拉力试验机、冲击试验机、弯曲试验机、疲劳试验机、摩擦磨损试验机、试验机、电液伺服万能试验机、抗折抗压试验机、压力试验机
- 主营：电耙子、煤矿井下用隔爆装置、泥浆泵、液压块式制动器、密闭门、全液压钻机、高倍数泡沫灭火装置、洒水降尘装置、阻化泵、阻燃调节风窗、检力器、流量计、氧气呼吸器、乳化液泵、钻机配件、矿用电缆、破拆工具、矿用电池、旧枕木、风筒、氧气充填泵、风机、避难硐室、无压风门、氢氧化钙检验仪器、多参数检测仪
- 主营：盘形闸刹车块、矿山机械
- 主营：除雪车、冲击夯、取样泵、电力液压块式制动器、扫地机、圆环链、消防仪、拉毛机、铲除机、环切机、抓木器、修剪机、测量仪、除雪机、除草机、测试台、光敏机、小挖机、炒茶机、粉碎机、压雪车、光度计、运输罐、扫描仪、磨光机、施肥机
- 主营：刹车片、液压失效保护制动器、液压盘式制动器、钳盘式制动器、电力液压臂盘式制动器、电磁盘式制动器、气动盘式制动器、电力液压制动器、偏航 制动器、高速轴制动器、电力液压推动器、偏航摩擦片