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The benefits of disc brakes over drum brakes are numerous:

1: More clamping power. The act of squeezing a disc by two opposing brake pads (as opposed to two shoes pushing outward on a drum) "grabs" harder for the same given contact area.

2: Easier to maintain ie there is minimal maintenance. there are no adjustments necessary. You use your brakes until they are worn and replace them. drum brakes (even the self-adjusting type) require adjustments. Mostly this involves moving in reverse with some speed and forcefully braking to reseat the shoes.

3: Safer: I'm not 100% sure, but I don't believe drum brakes are offered with ABS. On top of this, even IF you were able to get ABS with drum brakes, if you were to drive to deep water, it's possible ot get water inside a drum brake and that brake then becomes useless for stopping. Disc brakes can be operated while wet because the act of braking squeegees the film of water off and lets them be useful in a hurry.

4: Performance: Race cars do NOT use drum brakes. There's a reason-see #1.
That depends on your bikes rotor design. If you have a large thick rotor disc-it can get hot and have a hard time shedding that heat leading to brake fade. Also if its a large heavy rotor it has a pronounced gyroscopic effect to your bikes handling-which isnt the best.

A wave rotor promotes better cooling and typically less unsprung mass plus many like its look.

less spinning weight on the wheels can make the bike more responsive and have less mass to slow down. ;-)

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Q: What are the benefits of disc brakes?
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