Ok here is my 2 cents. I think the problem with your scrub brake is how you have it mounted. The way it is when you push on the pedal only the bottom part rotates and rubs the tire. That kind of brake pad needs to swivel so that when pushed the whole brake pad can contact the tire. I have a sears mini with a scrub that will lock the tire up anytime. It has a bracket that comes off of where your pad is mounted now that drop down 90 degrees to the brake pedal. These brackets are a couple inches long, and the pad mounts to them. Which I'm sure gives more leverage, and like I said lets your brake rub more of the tire. I hope I described that ok for you. If not I can dig up some pics later.:thumbsup: