What are the main materials of the "semi-metal" hybrid brake pads?

The "semi-metal" hybrid brake pads (Semi-met) are mainly made of rough steel wool as a reinforcing fiber and an important mixture. From the appearance (fine fibers and particles), asbestos-type and non-asbestos organic type brake pads (NAO) can be easily distinguished, and they also have a certain magnetic property.

Steel wool has high strength and thermal conductivity, which makes the "semi-metal" hybrid brake pads have different braking characteristics than the traditional asbestos brake pads. For example, the “semi-metal” brake pad has a high internal metal content and high strength. The high metal content also changes the friction characteristics of the brake pad. It usually means that the “semi-metal” brake pad requires a higher brake pressure to accomplish the same. Braking effect. In particular, high metal content in low temperature environments also means that the brake pads can cause large brake disc or brake drum surface wear and produce more noise.

The main advantages of the "semi-metal" hybrid brake pad (Semi-met) are its temperature control capability and high braking temperature. The poor heat transfer performance of the asbestos type and the poor cooling capacity of the brake disc and brake drum. Heat is transferred to the brake caliper and its components as they help the brake disc and the brake drum dissipate heat from their surface as they brake. Of course, if these heat treatments are not handled properly, the temperature will rise after the brake fluid is heated. If the temperature reaches a certain level, the brake will shrink and the brake fluid will boil. This heat also has a certain influence on the brake caliper, the piston seal and the return spring, which will accelerate the aging of these components, which is also the reason for reassembling the brake caliper and replacing the metal parts during the brake repair.