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If this fills with water and then stopped and does nothing your lid switch has failed. This is a very common issue on this machine, it would have nothing to do with the brake still have the motor running or trying to run even if there was a problem with the brake, this is the lid switch,
you need to order and replace it, you can order it at the following link, http://www.repairclinic.com/PartDetail/Lid-Switch-Assembly/12001908/916383?modelNumber=MAV6257AWW
there should be power to the switch though?