when you fitted the brushes did you have a meter to check for continuity of the windings and accross the armature as a brush may not have seated correctly,also did you clean up the comm on the armature as it may have carbon on it, do another check on the brushes and also tie down the loom onto the motor case otherwise a wire or two will pull off the connector, listen to see if you hear a relay on the board click in about a minute after starting the spin .
keymatic
September 2012