im not familiar with bosch. however most brushes are installed in a similar way. it may be easier to remove the motor first, simply unbolt it. look for the 2 wires actually going into the motor they will be opposite each other and connect to the brushes. the brushes should simply unclip using a screwdriver and then just slide the new ones into place. they will either click into place or be held by some sort of clasp. hope this helps.
Gary
August 2005