The problem is aluminum calipers and steel bleeders,time heat elemants all add to this. Does your car have alum calipers,and what thread pitch are they. Capital speed sells replacement bleeders for calipers,the trick is its a npt thread into the caliper and its machined with a smaller bleed screw in side. like a bushing or reducer. They cost 2.50 and its easier to replace them then buying calipers. Speedway motors has them too.page 117 2009 oval track catalog.
Dan