Do you know how it's broken?
The easiest way to do the job is to wind the motors back with a pp9 battery and 2 fly leads, assuming VIDA not available. Trying to remove the motor is fine if the 2 Torx bolts come undone, mine would not.
Disconnect the plug on the caliper, crimp a spade connector to 2 pieces of wire and push onto the exposed terminals on the motor, bare the other ends and hold onto the terminals of the pp9 battery, if motor pushe's the pads out reverse the conections on the battery. Once motor fully rewound push piston back into caliper, fit new pads and reconnect the plug you disconnected at the start of the job. Apply handbrake and after first application which will take longer than usual all should be good.
For it to not work then the motor is either not connected, not fixed to the caliper or has somehow failed electrically, which may be coincidental or the result of bodging. Pulling the wheel off will quickly show mechanical damage or disconnection, the plug should only fit one way and a simple test lamp will confirm power to the plug.
Paul.
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