So the time has come to replace the brushes in your Makita drill. Don't worry, this is a very simple process when you have the right steps. So, I'll lay down a few preliminary factors and then get straight to the point. You'll want to read your drill's manual. There, you will find valuable information regarding your brush replacement (and any other thing you might wonder about in the future). Also, because many drills take different brushes, you'll want to ensure you have the right brushes for your specific model. And finally, simply make sure the drill is entirely off, unplugged, and otherwise powerless. Anesthetize it, so to speak, and then we'll cut to the chase.
As we move on to actually finding our brushes, the chase begins. Generally, Makita drills provide easy access to their carbon brushes. Unless your model is of the particularly old variety, you will have either a rear cover or brush caps. A rear cover is a dome-shaped piece of the drill housing at the very rear of the drill that can be removed without completely disassembling the housing. Removing the rear cover should plainly expose the brushes. Brush caps will be on either side of the drill, also near its rear. They are, again, small pieces of the housing (about one square inch in size (give or take) that are usually black in color (or some shade different from the whole of the housing)) that when removed will take you straight to the brushes. If you don't have brush caps or a rear cover on your drill, you will need to open-up the drill's housing or clamshell. Keep in mind when removing anything from the tool though, that you will soon have to replace it; reassembly hinges on the organization of disassembly. After removing the top half of the housing, the brushes should be located at the at the back of the motor in the rear of the drill.
Cordless Dewalt
The brushes will be tucked into a guide sleeve. Remove them from the guide sleeve and replace the new ones in exactly the same fashion as the others were removed. Your brushes should be making solid contact with the armature and just like that, the chase is essentially complete. Carefully put the drill back together and re-engage it for the final step of the procedure. Test all the functions of the drill; run it in forward and reverse, change the gears if you have the capability, drive a screw or drill a hole and make sure all has come back together properly. If all checks out, then you have successfully replaced your brushes. However, if all things don't check out, you should retrace your steps to ensure no minor mistakes climb out of the woodwork. Take the drill to a Makita authorized service center if no mistake emerges or if any problems persist.