Disc brake drag is when your brakes fail to release completely after you have removed your foot from the brake pedal.  As you may already know, the continuous use of your brakes may cause them to overheat—brake drag is problematic because the brakes would remain applied which results in overheating and damaged parts.  Let us begin by mentioning that a little brake drag is normal and brake pads and rotors are usually in slight contact.  If you were to spin your wheel, the wheel should be able to partly turn on its own.  If the wheel does not spin and there is a lot of turning resistance, then there may be more brake drag present than you want.  One main cause of disc brake drag involves the brake calipers.

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Brake calipers are responsible...