I suspect that the electromagnetic brake has seized. I have come across this a few times on some of the larger pride scooters, usually if they have got wet and been left for a while. They can normally be free'd off. First, loosen the left hand rear wheel nut (the one in the middle of the wheel). Put the scooter into freewheel and jack the rear wheels off the ground. Remove the left hand rear wheel and be carefull not to lose the hub key which locates between the axle and hub of the wheel. Unplug the wire that comes out of the brake, then remove the brake from the end of the motor. Before going any further, check to see if you can move the disk inside the brake (the disk is the black part that you can see on the inner side of the brake with the hexagon cut out). If you can move this disk at all, the brake is NOT seized. While at this stage, plug the brake connector wire back in , turn on the scooter and press the throttle lever. If the motor spins, you can discard the motor as being of any promblem. If the brake IS seized, it will need to be dis-assembled. Dis-assembling the brake usually requires the removal of 3 or 4 small allen headed bolts on the rear of the brake, followed by some spacers, small washers and a small ball bearing or two. Watch what comes off and in what order, and be carefull not to lose any parts. Free off the black fibre type disc from the metal plate that it is stuck too. This can be done using a small hammer and large flat bladed screwdriver taking care not to damage the disc. Lightly rub the metal plate with fine grade wet and dry to remove any rust or dirty deposits, then re-assemble the brake in the reverse order, and refit the rear wheel making sure you apply a small amount of grease to the axle shaft.
This should work for you but failing that, I think you will need a new brake assembly.
Hope I have been of some help to you.
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