What is the primary function of the chain brake in a chainsaw?

The primary function of the chain brake in a chainsaw is to stop the chain. This safety feature is designed to quickly halt the movement of the chain in case of kickback or other emergencies, thereby protecting the operator from potential injuries. The chain brake can be activated manually by the operator or automatically in reaction to certain conditions, such as a sudden upward force on the front handle during kickback, making it an essential component for safe chainsaw operation.

While other components of a chainsaw may serve functions such as lowering noise levels or preventing engine issues, the chain brake's focus is solely on halting the chain's motion to enhance user safety.