Brake Lining

Brake linings are friction components used in drum and disc brakes for passenger cars, commercial vehicles, and industrial machinery. They are specified by friction coefficient, thermal stability, wear rate, and mechanical strength. Grades vary by application: organic (resin-bonded), semi-metallic, low-metallic, and ceramic, each offering different performance in terms of noise, dust, and high-temperature behavior. Linings are typically riveted or bonded to the brake shoe or backing plate.

Typical reference parameters (per GB 5763 and other standards) include: dynamic friction coefficient at 100°C of 0.35–0.45; hot friction at 300°C of 0.25–0.35; wear rate at 100°C of 0.1–0.5 ×10⁻⁷ cm³/N·m; shear strength ≥3.0 MPa; hardness (Rockwell R) 80–110; density 1.8–2.2 g/cm³; max operating temperature 350–450°C; thickness 6–20 mm; width 50–200 mm; arc length 200–500 mm; tensile strength ≥10 MPa; compressibility ≤2%; thermal expansion ≤0.1% at 200°C; pH value 7–9. These are directory reference ranges; actual values must be confirmed for the specific model and application.

Materials on file include phenolic resin, aramid fiber, glass fiber, steel fiber, copper powder, graphite, ceramic fiber, and rubber. Standards referenced include GB 5763-2008, SAE J661, ISO 7881, and ECE R90. Always verify model-specific values and standards with the legal manufacturer or supplier before procurement or use.

When the brake is applied, the lining is pressed against the rotating drum or disc, creating friction. This friction converts the vehicle's kinetic energy into thermal energy, which is dissipated through the brake assembly. The lining's material composition determines its friction level, wear resistance, and ability to maintain performance at high temperatures. The friction coefficient must remain within safe limits to ensure effective braking without excessive wear or fade.