Genmitsu Carbon Brush Set (20PCS), 8.89 × 5.84 × 31.24 mm, Suitable for Genmitsu & Makita Trimmer Routers

What is Carbon Brush In power tools, carbon brushes transmit current from the power source to the tool's rotor, ensuring the tool's stable operation. The specific uses are as follows: Current conduction Stable performance Protection of motor Reduces noise and sparks   When It Needs To Be Replaced In power tools, here are a few common signals to replace carbon brushes: Brush length wore to its limit Increased or excessive sparking Power drop or unstable speed of the power tool Rattling motor Carbon brush surface obvious damage or cracks TIP Worn motor carbon brushes can cause intermittent function, weakened braking, and reduced power. Replace them promptly. When changing brushes on power tools, also inspect the armature for burns, cracks, or damage, as these may indicate larger motor problems that brush replacement alone won't fix