To identify semi-metallic brake pads, it's important to note that these pads typically have a lower friction coefficient, usually around 0.38, and a shorter lifespan. Most vehicles are equipped with this type of brake pad when they leave the factory, as they are the most economical option. However, some manufacturers do produce these brake pads with a higher friction coefficient.
Brake pads are generally composed of a steel backing plate, an adhesive insulation layer, and a friction block. The insulation layer is made of materials that do not conduct heat, serving the purpose of heat insulation. The friction block consists of friction materials and adhesives, which create friction when pressed against the brake disc or drum during braking, thus slowing down or stopping the vehicle.
When the thickness of the brake pad is visually reduced to about one-third of its original thickness (approximately 0.5 cm), it's time for the owner to increase inspection frequency and be ready to replace them. Semi-metallic brake pads typically start with a thickness of around 1.5 cm and gradually wear down as they are used.
