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Drum brakes have cooling problem because the friction occurs at internal surfaces, difficult to remove.
Non-uniform wear of brake pads because of curved shape.
Loss of efficiency of braking due to expansion.
Higher weights.
Comparatively low anti-fade characteristics.
Comparatively complex design.
Total friction area is comparatively very high almost four times than disc brake.
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Friction surface is in direct contact of air, hence easy cooling.
Uniform wear of pads because of straight shape.
There is no loss of efficiency.
Lower weights.
Comparatively high anti-fade characteristics.
Simple designs.
Low total friction area.
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