What problems will occur if the carbon brush is broken?

[LeZachary]

If the starter carbon brush is broken, the motor of the starter will not rotate or will lack power. This manifests as hearing a slow and weak starting sound or only hearing the sound of the small flywheel gear operating mechanism. The engine may struggle to start or even fail to start completely. Notes: 1. The starter is only used during startup. Generally, the carbon brushes in a vehicle's starter can last for over ten years without issues. However, other causes of starting difficulties, such as needing multiple attempts to start the engine, can accelerate carbon brush wear and shorten their lifespan. 2. Carbon brushes are mainly made of graphite containing copper and silver, used to transfer electrical energy between the fixed and rotating parts of the motor. The carbon brush in a starter is block-shaped and is pressed against the commutator shaft of the starter by spring preload. 3. The starter needs to generate significant torque to move the engine's flywheel crankshaft and crank-connecting rod mechanism, so starters typically include a planetary gear mechanism to reduce speed and increase torque.