Bought 2 caliper rebuild kits for an '86 Yamaha SRX 6. Nice complete kit, especially for an older bike. However, I see a couple items that could be improved. - 1 piston(out of 4) (2 kits) measures about .005 larger than the original. Not sure how important this is. - The bleed nipples leak. Unfortunalely, this ruined fresh paint on the calipers. I had to reuse the original ones. Might want to make sure the mating surface angle is proper. Time will tell as to the quality of the seals. I have tried a rebuild kit from a UK supplier in the past, with disappointing results.