I have probably read thousands of Sawstop threads where the brake activated when there was no safety risk and this is just about the first time I have heard of a defective brake cartridge. It seems to me that their stuff is pretty reliable. I worked in a manufacturing plant where product failure could very well lead to death. In spite of all the money we put into product safety and integrity, we got bad product going out the door occasionally. Perfect manufacturing just isn't a realistic expectation.