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Wow, that's hard to explain without pictures.

Disk brakes are plates or disks that rotate when the wheel rotates and in the direction the car is moving, to provide braking the outer edge of these plates are pinched by things called brake pads to stop their rotation.

Drum brakes are harder to explain. A shallow hollow cylinder about a foot in diameter (called the drum), that's also in line with the wheel, rotates when the wheel rotates when the brakes are applied brake pads (called shoes) inside the rotating cylinder are pressed outward against the inner surface of the shallow cylinder. The picture above shows the shoes. The shallow cylinder/drum (not shown) covers these shoes.

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Q: How do disc brakes and drum brakes differ and how are they alike?
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