If you can run your saw with the chain brake on, you got no chain brake! Duh! Sorry, but, really,
Jeff
Sorry, but, really, "Duh!" back at you big boy. The chain brake really functions to stop the chain from moving once the trigger/throttle is released, and when it the saw is idling. It will not stall out the saw. The centrifugal clutch can still turn with the brake on, and when you try to run the saw with the brake on, the motor will turn and the clutch drum will heat up fast.
Philbert