What is the difference between single-piston and four-piston?

[JulianaLynn]

The difference between single-piston and four-piston is that single-piston applies braking force in a single direction, while four-piston uses opposing braking, resulting in stronger braking performance for the four-piston system. The relationship between piston calipers and pistons: Piston calipers are part of disc brakes and are the devices that push the friction pads against the brake disc. Therefore, the number of piston calipers generally indicates how many individual pistons there are. Characteristics of different piston quantities: More pistons do not necessarily mean a larger contact area between the pistons and the brake disc. During braking, multi-piston calipers use hydraulic fluid to push pistons on both sides through the caliper's pipelines, simultaneously pressing the brake pads against the brake disc to achieve braking. The total number of pistons is usually two or more, always an even number, and the arrangement of the pistons varies depending on the direction of force applied to the brake pads during friction with the chassis.