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The role of carbon brushes is to transfer the rotor current required for motor operation to the rotor coils through connections on the slip ring. The fit and smoothness of the carbon brushes with the contact pieces, as well as the size of the contact surface, affect the lifespan and reliability of the brushes. In DC motors, they also perform the task of commutation (rectification) for the alternating electric potential induced in the armature windings.

Every electric tool relies on carbon brushes, which conduct electricity. When any machine you use stops operating, it might be time to replace the carbon brushes.