How to Replace Milwaukee Drill Brushes

Written by g.k. bayne
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How to Replace Milwaukee Drill Brushes
Milwaukee drill, note black brush covers near rear of drill. (drill image by Greg Pickens from

Milwaukee is a manufacturer of hand power tools. The most popular perhaps are hand power drills. The hand drills are electrically powered by 120 VAC (volts alternating current). The electrical power is conducted to the interior drill motor through carbon brushes. Over time, the carbon brushes will wear down from use. Replacing the carbon brushes is a relative quick process and can be performed in less than 15 minutes. It is important to ensure that the correct size of carbon brushes is used for the replacement.

Skill level:
Moderately Challenging

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Things you need

  • Screwdriver
  • Replacement carbon brushes

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  1. 1

    Remove all electrical power from the hand drill. Unplug the drill's power cord from the wall outlet.

  2. 2

    Locate the electrical brushes covers. These are located near the rear of the drill. Typically the round black covers are orientated at the 3 o'clock and 9 o'clock position on the drill motor housing.

  3. 3

    Use the screwdriver and insert it into the slot on the surface of the brush cover. Turn the screwdriver in a counter clockwise direction. Remove the cover.

  4. 4

    Pull the old electrical carbon brush from the interior hole. Note the end of the brush is a flat piece of metal with a spring attached. On the end of the spring is the carbon brush.

  5. 5

    Pay particular attention to the orientation of the carbon brush when it is fully removed from the brush housing. The end of the carbon brush will be curved. You must align the curve on the new brush replacement in the same orientation as the old one, when it is removed. In other words, the curve on the carbon brush must be inserted into the housing so the face of the curve rides against the drill motor's electrically conductive parts.

  6. 6

    Push the spring down into the housing. Hold the rear metal tab inward. Place the cover into the housing screw threads. Turn the plastic cover in a clockwise direction to start the threads. Tighten with the screwdriver.

  7. 7

    Perform the same task to the other brush as described in Step 3 through 6.

Tips and warnings

  • Always replace both brushes at the same time. Replacing only one brush will cause uneven wear to the electrically conductive parts of the drill motor.
  • Never service any electrical device while it is still energised. Severe electrical shock or burns can occur.

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