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Hi my name is Robert....
You are correct normally when you release the parking brake the jacks should retract, this could be an issue with the control box, the control box is between the pad and motor. I would find that and check the connections. Also you can try a reset, try holding down ALL 4 diamond shaped buttons and see if they retract for you.... Robert
Also you might be able to manually retract them, click HERE for some info on that..
Hope this helps some... Robert