| All these are from various motoiq articles I've read. This would probably be more convicing if i different sources, but motoiq is one of the only publications I read that goes into technical detail. [ http://www.motoiq.com/magazine_articles/articletype/articleview/articleid/1611/pageid/2151/stoptechs-nissan-350z-bombproof-brake-upgrade.aspx ] "To keep the Stoptech calipers streetable, they are equipped with piston dust boots to protect the seals from brake dust. Normally race calipers don't have dust boots because they usually end up getting oxidized and hardened from heat and race calipers are maintained frequently. Unfortunately street calipers are usually not maintained as well and corrosive brake dust, dirt and debris often get to where they can abrade the seals and corrode the pistons on a racing caliper causing leaks."
[ http://www.motoiq.com/magazine_articles/articletype/articleview/articleid/1692/pageid/2322/how-to-rebuild-brake-calipers.aspx ]
"The dust boot on this caliper was lifted and allowed moisture to corrode the inner bore and dust seal groove. This caused the caliper to ‘stick’ and bind, not allowing the caliper to release. " "The hole in the piston was due to the corrosion in the caliper rubbing the piston and causing it to bind. This is an example of where the caliper and piston need to be replaced. The other caliper and piston are in great shape and can continue to be rebuilt. "
and what I was saying about the piston size:
A very important advantage of Stoptech calipers is that the proportioning of their systems is calculated to match the S2000's hydraulic system. On stock single master cylinder brake hydraulic systems, the brake's proportioning is mostly determined by the caliper piston size. The larger the piston the greater the hydraulic force applied to the brake pad, the smaller, the less. Stoptech duplicates the OEM proportioning using 19 different possible combinations of piston sizes. Stoptech has the greatest spread of piston sizes available on the market and thus can come the closest towards duplicating the correct proportioning when compared to other manufacturers. Many things are considered when choosing piston sizes; stock master cylinder bore diameter, car size and weight, weight distribution, brake pad size, rotor size, tire size and wheel size.
[ http://www.motoiq.com/magazine_articles/articletype/articleview/articleid/1639/pageid/2216/project-honda-s2000-part-3-brakes-that-dont-break.aspx ]
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