Carbon Brush Set CB440

Small screwdriver, pointed object, such as knife blade or an awl. Remove screws from the rear cover. Pull spring keeper back, remove brush. use pointed tool to pop off clip. Pull back spring keeper insert new brush. Pop on new clip. x2, done

Remove cover,
Make a wiring diagram, remove old switch, install the new switch
Disconnect the old brushes then, connect the new ones
Remove Forward Reverse lever and install new
Install cover

Thought it might have been the switch but the suggested solution for the problem I was having was replace brushes (75% vs 12%) and that's exactly what it was.
Remove two screws from back of drill housing.
Lift retainer spring off of brush with nail or screw.
Pull worn brush out by wire with needle nose pliers and remove clamp at other end of wire.
Do the same in reverse order to install new brushes

1. Took apart the drill
2. Replaced the broken parts.
3. Reassembled the drill.

Removed the two screws on the back of the Drill/Driver
Removed the end cap
Pried the clip up that held the wire
Carefully pried the retaining spring away from the brushes, and removed them one at a time.
Slide the new brushes in place.
Routed the wire around the brush holder, and secured the retaining clip.
Re-installed the end cap, careful to align the bearing on the shaft with the cut out on the cap, and replaced the two screws.

1. Removed the four screws on the right angle head
2. Pulled off spacer between the head and main tool body
3. Removed the four smaller screws from the right side of the tool
4. Removed the right half of the tool
5. Pull up on the brush "ring" up just enough to have access to both brushes
6. Note the direction the wire from the clips to the brush itself
7. Use the right angle pick tool to pry up the clips.
8. Use the same tool to move the spring arm that holds the brush to the armature. Use the very small divet on the side of the brush holder to hold the spring arm.
9. Remove and reinstall the new brushes, make sure the spring arm is back holding the brush.
10. Slide the brush ring back into place, reinstall the side, spacer and right angle head.

Removed the 2 phillips end cap screws to access the brushes. They simply pull out to the holder after I took a pick and held the brush spring off to the side. When replacing the holder you have to separate the two halves of the handle. Not a big job. Just make sure you line up the steel field that the armature turns in. It has a notch in it that has to line up with the one in the handle housing. If you don't do this you can't get the housings completely together and wonder why. This happened to me. Also make sure the detent springs for the High/Low don't fall out when putting the two halves together. Otherwise it was a simple repair. I have done 2 drills so far in our business and plan to get more parts to do more. Parts are identical to the original and are in Makita labeled packaging. Also great pricing.

Opened the drill, removed old carbons, replaced with new, closed it right back

Replaced brushes; easy. Just make sure to note how the old ones fit, and put the new ones in the same way

Two screws to remove, pop out old brushes, install new brushes, re-install cover with two screws, smile wide as drill is good as new!