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They cool off faster than drums when used frequently, and they are easier to change when worn.

They also have a much shorter stopping distance and stop better in wet conditions. than drum brakes.

They don't lock up as easy as drums, and repeated stopping distance doesn't increase as much with use.

They are also lighter than drums, cheaper to maintain (typically), and much less susceptible to "brake fade" since the rotor expands closer to the friction linings from heat instead of further away from the friction linings as a drum would. (This is especially noticeable in heavy commercial vehicles and vehicles pulling trailers.)

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