Hey so I just got a 2002 Yukon. When I apply the parking brake the light flashes. Even when I’m parked. And the pedal just goes to the floor and doesn’t hold the truck at all. It’s just the brake light, and not the abs light. And the gear selector does show that I’m in park. Brake fluid is good, I checked and have no brake leaks. I’m sure the travel is due to low shoes, or a bad cable, but my main concern is why the light would flash. Any help appreciated! Thank you!