Ceramic brake pads

　　Ceramic brake pads are a type of brake pad; many consumers initially assume they are made entirely of ceramic. In fact, ceramic brake pads are based on the principle of metal‑ceramic composites rather than purely non‑metallic ceramics. During high‑speed, heavy braking, the friction surface can reach extremely high temperatures—up to 800–900°C, and in some cases even higher. At these elevated temperatures, a sintering‑like reaction occurs on the pad’s surface, resulting in excellent thermal stability. By contrast, conventional brake pads do not undergo such sintering at these temperatures; instead, the rapid rise in surface temperature can cause the material to melt or even form an air cushion, leading to a sharp decline in braking performance after repeated applications or even complete loss of braking capability.

　　These include mineral fibers, aramid fibers, and ceramic fibers (since steel fibers can rust, generating noise and dust, they do not meet the requirements of ceramic‑type formulations). Ceramic‑type brake pads are lighter in color and more expensive than other types; they are cleaner and quieter, and while delivering outstanding braking performance, they cause minimal wear to mating components. A ceramic‑type formulation does not necessarily mean that ceramic fibers are used; the primary criterion for determining whether a formulation is ceramic‑type is the material’s performance—specifically, the performance of the finished product, rather than the raw materials employed.

　　Ceramic brake pads offer the following advantages over other types of brake pads:

　　(1) The most significant difference between ceramic brake pads and conventional brake pads is the absence of metal. In traditional brake pads, metal is the primary material that generates friction, delivering strong braking performance but also resulting in substantial wear and a tendency to produce noise. After installing ceramic brake pads, no abnormal squealing—commonly referred to as scraping noises—occurs during normal driving. Since ceramic brake pads contain no metallic components, they eliminate the metallic screeching that arises from the friction between conventional metal brake pads and their mating components (i.e., the brake rotor).

　　(2) Stable coefficient of friction. The coefficient of friction is the most critical performance indicator for any friction material, directly determining the braking effectiveness of brake pads. During braking, friction generates heat, and as operating temperatures rise, the friction materials in conventional brake pads tend to lose their effectiveness, causing the coefficient of friction to decline. In practical applications, this reduction in friction can weaken braking performance. With immature friction materials, standard brake pads may exhibit excessively high coefficients of friction, leading to unsafe conditions such as loss of directional control, pad overheating, and damage to the brake rotors. By contrast, even when rotor temperatures reach 650°C, ceramic brake pads maintain a coefficient of friction of approximately 0.45–0.55, ensuring reliable braking performance under all conditions.

　　(3) Ceramics exhibit excellent thermal stability, low thermal conductivity, and superior wear resistance. With a long-term service temperature of up to 1,000°C, these properties make ceramics well-suited to meet the stringent performance requirements of high‑performance braking materials, enabling brake pads to achieve higher speeds, enhanced safety, and improved wear resistance.

　　(4) It possesses excellent mechanical strength and physical properties, capable of withstanding substantial compressive and shear forces. Before assembly and installation, friction‑material components must undergo machining operations such as drilling and fitting to form the complete brake pad assembly. Therefore, the friction material must exhibit sufficient mechanical strength to prevent breakage or fragmentation during machining or service.

　　(5) It exhibits very low thermal fade. Whether it is the first-generation ceramic product of grade M09 or the fourth-generation ceramic brake pads of TD58, they both continue to ensure excellent braking performance, thereby guaranteeing safety, with minimal thermal fade.

　　(6) Enhance the performance of brake pads. Due to the rapid heat dissipation of ceramic materials, their coefficient of friction in brake applications is higher than that of metal brake pads.

　　(7) Safety. During braking, brake pads generate instantaneous high temperatures, particularly at high speeds or during emergency stops. Under such high‑temperature conditions, the friction coefficient of the friction material decreases—a phenomenon known as thermal fade. Conventional brake pads exhibit significant thermal fade; elevated operating temperatures and abrupt braking can cause the brake fluid to overheat, leading to delayed braking response or even complete loss of braking effectiveness, thereby reducing the safety margin.

　　(8) Comfort. Among comfort-related factors, vehicle owners are typically most concerned about brake‑pad noise; in fact, noise has long been an intractable issue with conventional brake pads. Noise arises from abnormal friction between the friction material and the rotor, and its causes are highly complex—braking force, rotor temperature, vehicle speed, and environmental conditions can all contribute.

　　Furthermore, the causes of noise differ across the three distinct phases—brake application initiation, brake actuation, and brake release. If the noise frequency falls within the 0–550 Hz range, it remains imperceptible inside the vehicle; however, once it exceeds 800 Hz, drivers can clearly perceive the braking noise.

　　(9) Superior material properties. Ceramic brake pads are made from high‑tech materials such as large‑particle graphite, brass, advanced ceramics (non‑asbestos), and semi‑metallic compounds, offering excellent resistance to high temperatures, outstanding wear resistance, stable braking performance, the ability to repair damaged rotors, environmental friendliness, quiet operation, and a long service life. By addressing the material and manufacturing shortcomings of conventional brake pads, these pads represent the most cutting‑edge advanced ceramic brake technology available worldwide. Moreover, their low content of ceramic debris and superior reinforcement help reduce both counter‑wear on the rotor and noise levels.

　　(10) Long service life. Service life is a key concern for many; conventional brake pads typically last less than 60,000 kilometers, whereas ceramic brake pads can exceed 100,000 kilometers. This is because ceramic brake pads use a unique formulation that contains only one or two types of electrostatically charged powders, while the remaining materials are non‑electrostatic. As a result, any dust generated is carried away by the airflow as the vehicle moves, preventing it from adhering to the wheel hub and compromising aesthetics. Moreover, the lifespan of ceramic materials is more than 50% longer than that of standard semi‑metallic pads. After switching to ceramic brake pads, no scoring (i.e., scratches) appears on the brake rotors, extending the original rotor’s service life by approximately 20%.

　　Huangshi Saite Friction Materials Co., Ltd. filed an invention patent application for this ceramic friction pad in December 2010 and was granted the patent in 2012.

 

(Note: Patent certificate for ceramic friction pads)