Brake caliper rebuild

[mike042]

2011 RSV I'm changing the seals in rear brake caliper,  are there 2 different sizes of the 4 pistons? I was ordering the seal kits from partzilla and seems to be two different part numbers. 

[Marcarl]

I only see one kit. Cheaper at: https://www.yamahasportsplaza.com/oemparts/a/yam/5004d6cef87002275461d662/rear-brake-caliper

[Marcarl]

4 minutes ago, Marcarl said:

I only see one kit. Cheaper at: https://www.yamahasportsplaza.com/oemparts/a/yam/5004d6cef87002275461d662/rear-brake-caliper

On a second look, there does seem to be 2 numbers that are needed to complete the rebuild. Somebody more knowledgeable needs to chime in here.

[BratmanXj]

There were Inner & Outer seals on mine, but its been a few years since I've been in there.  I bought a complete rebuild kit from All Balls when I did mine
https://www.allballsracing.com/18-3194.html

[Marcarl]

6 hours ago, BratmanXj said:

There were Inner & Outer seals on mine, but its been a few years since I've been in there.  I bought a complete rebuild kit from All Balls when I did mine
https://www.allballsracing.com/18-3194.html

There you go! Good answer!

[mike042]

Yes I know there are 2 seals on each piston. I ordered 1 of each part number, they just came and matching them to each other they look identical.  So I don't know why the numbers are different but  at least I have all the seals I need .  Just another mystery of partzilla 

[Marcarl]

The one seal would be grooved, the other I think is flat. Grooved to the outside.