If you look at least
There's a brake pad in the caliper.
The rotor is attached to the wheel.
If you press the brake, the caliper sticks to the rotor
At this point, the brake pads actually adhere to the rotor, creating a frictional force that activates the brake.
If you look at the picture here, you'll understand.
For more information, you can look at the link below
http://blog.gm-korea.co.kr/2895
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