Originally Posted by AP - Chris_B

I've only dealt with this issue a handful of times, but not in the last year or two. Currently, all AP Racing road car calipers are being shipped with seal material technology that was used in professional racing just 5 years ago. Due to increased sales volumes, AP was able to improve the material and swallow the cost increase. If anyone experiences an issue, they should contact their AP distributor. All caliper seal kits available now are the latest seal material.