Hi Jaguar.I just did a pals 900F calipers.The pistons are very robust and most likely won't need replacing.The piston and dust seals,2 of each per,are available from Honda at reasonable cost and are usually the only parts needing replacement.In fact,the piston seals have usually been reusable in all the Honda calipers I have done over the years.Many will disagree with not replacing them,certainly not on brakes,however I do not like replacing parts that pass inspection,and have yet to be disapointed. Rock On
