Disc brakes

Disc brakes
Disc brakes are an order of magnitude better at stopping
vehicles than drum brakes, which is why you'll find disc
brakes on the front of almost every car and motorbike built
today. Sportier vehicles with higher speeds need better
brakes to slow them down, so you'll likely see disc brakes on
the rear of those too.
Disc brakes are again a two-part system. Instead of the
drum, you have a disc or rotor, and instead of the brake
shoes, you now have brake caliper assemblies. The caliper
assemblies contain one or more hydraulic pistons which
push against the back of the brake pads, clamping them
together around the spinning rotor. The harder they clamp
together, the more friction is generated, which means more
heat, which means more kinetic energy transfer, which slows
you down. You get the idea by now.