If on your setup the ebrake cable is attached to the actuator on the caliper it is possible that, that s what is nor released all the way. If you needed to replace the actuator or the caliper they come as one unit so both would get replaced anyway. If you want to check if the actuator is frozen, remove the ebrake cable from the actuator. Then it should spring back to its resting position with ease. You can tap it with a hammer to make sure it is all the way released. If it does move freely the ebrake cable may be frozen, or the caliper piston. And make sure the caliper slides are free and move easy on the bracket.
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