Not on pavement. I know I locked up the rear 11" drum brakes on the wagon, thirty years ago when a car pulled out in front of me. They were way too close, so I locked up the brakes for a brief moment, then dropped a gear and went through the ditch to avoid them. The ditch was fairly shallow, so it was more tall grass, so all was good. When the 2A brakes are adjusted just right, it will come awfully close to locking them up, but without just standing on them until it fully stops the tire on pavement hasn't been big on my list of things to try with good tires on. I'm cheap, so I'd hate to flat spot the BFG all terrains.