Do disc brakes drag?

This is a common misconception. Disc brakes drag as much as any other brakes that are poorly setup. They do not normally produce any drag unless installation, setup or adjustment is incorrect. Refer to the factory manual for your brakes to find out how to perform these steps correctly. There is one disc brake that is supposed to drag and this is due to its design. This is the Magura GustavM and it's a dedicated DH racing brake. The slight drag does not slow the bike down at all. Note from Pat T who uses Gustav: The drag is hardly noticeable at all, sometimes you will hear the noise but mostly you won’t be aware of it.  more