Worn brushes are often the cause of a motor's poor performance. Replacing the brushes can repair a motor that runs intermittently. New brushes can restore a motor's electrical braking. Carbon brushes are one of the most commonly replaced power tool parts. This is because carbon brushes are wear parts, meaning that through friction and use, they gradually wear down until they need to be replaced. Worn brushes are a common cause of intermittent motor operation, reduced electrical braking, and reduced motor power. A worn brush is often worn near the conductive wire and may be cracked, pitted, or burned. When replacing carbon brushes, be sure to inspect the armature for burns, cracks, or other damage that could indicate larger motor problems.
