D340 brake pad steel backing: Typically, D340 steel backing features rivet holes for easy installation on calipers. A distinct characteristic of the steel backing is its thicker material (usually 4~6mm) and more complex production process. The quality of the braking system, beyond the friction pad's quality, hinges on the steel backing behind it. Therefore, the quality of the steel backing directly impacts the safety of the vehicle and its occupants, and is crucial to the vehicle's quality, reputation, and sales.