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What are the advantages and disadvantages of disc brakes compared with drum brakes?

Advantages:

(1) The braking efficiency is stable.

(2) Water recession has little effect.

(3) Thermal recession has little effect.

(4) When the same braking torque is output, the size and mass are generally small.

(5) It is easy to realize the self-adjustment of the clearance, and its maintenance and repair operations are also simple.

Disadvantages:

(1) The braking efficiency is low, so servo devices are generally used.

(2) When used for parking brake, the added transmission device is complicated, so its application on the rear wheel is limited.