What are calipers?
A brake caliper is a brake part
which houses the brake pads
as well as a hydraulically or pneumatically operated piston.
When braking, hydraulic or pneumatic pressure is used onto the piston via the braking liquid in the brake hose
. The pressure pushes the piston onto the brake pads which in turn are pressed onto the brake discs.
This results in friction between the brake pads and discs causing the vehicle to stop.
In general a caliper
house only one piston, however heavier vehicles with larger brake discs can also have calipers
with room for two pistons.