Did you get the spring installed correctly? The brake assembly is just three pieces, plus the cable. The backplate which has the connection for the shorting wire, the brake plate which pivots up to apply the brake pad to the flywheel, and the spring which keeps the pad pressing on the flywheel unless you pull the cable. The cable has a special mushroom end. If that mushroom end is missing you won't be able to pull the brake pad away from the flywheel. The spring goes between the backplate and the brake plate, with the cable going directly thru the spring.