Introduction
Purchase a new motor brush. The sander should be unplugged from any power sources. Make sure you organize the removed screws, so you can reinstall them in the correct location.
Tools
Parts
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            Using the T20 Torx Screwdriver, remove the four 15.6 mm screws securing the top cover to the sander. 
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            Lift the top cover off the sander. 
 
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            Using the T10 Torx Screwdriver, remove the four 9.7 mm screws securing the motor brushes to the housing. 
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            After the screws are removed, both motor brushes can be lifted out of their position by hand. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.