Rear Caliper parts

[Guest]

My rear caliper pistons were not moving as they should, one would move out but not go back in, the other piston would stay out but not hit the rotor much. I removed the caliper to clean and rebuild whatever is necessary but it seems the PO may have ditched a couple of parts.

Here' s one half of the rear brake caliper and the parts fiche:
(1) Will someone please confirm that the inner rubber seal I see in the pic below is #3 on the fiche?
(2) The PO must have determined that the piston boots (#4) and the caliper shims (#14) were optional, I don't have them. Are #4 and #14 something worth replacing?

[Agemax]

yes, 3 is the piston seals and you will need the boots and the pad shims.
make sure that caliper is spotless when you clean it, especially the groove that the piston seal seats in.

[btbarb]

Thank you sir.

[chuck hahn]

And if youll notice, theres an arrow stamped out of the pad shims. This arrow points to the front of the bike.

[Nessism]

I believe the arrow points in the direction of disc rotation.

[jwhelan65]

If the pistons are usable I would replace everything you see in that fiche. I would also go as far as tearing down the master cylinder and replacing the line while you have it apart. Its a little more work and not that expensive, well worth it.

[btbarb]

If the pistons are usable I would replace everything you see in that fiche. I would also go as far as tearing down the master cylinder and replacing the line while you have it apart. Its a little more work and not that expensive, well worth it.

Yeah, I think I will bite the bullet and get new braided lines and rework the whole thing from beginning to end. Never done it before, so consider this post fair warning. This was supposed to be a quick and simple 530 chain/sprocket project, but one thing led to another, and then another....

I'm guessing that moving the caliper and line while removing the rear wheel was just enough to dislodge or move some crap in the line which somehow made the system start misbehaving. It's time though, the lines are cracked and there's sludge throughout.

Ed and Chuck - I'll remember to look for the arrow.

[eil]

How do the pistons look? If there is any pitting on the pistons, get the piston kit. (#1 on the fiche.) It will include new pistons, oil seals, dust boots, and the seal in between the calipers (#5). If you don't need the pistons, at least get all new rubber parts.

When you rebuild the MC, make sure that teeny tiny return hole in the MC is not clogged. (Mine had all kinds of gunk in it.)

[btbarb]

How do the pistons look? If there is any pitting on the pistons, get the piston kit. (#1 on the fiche.) It will include new pistons, oil seals, dust boots, and the seal in between the calipers (#5). If you don't need the pistons, at least get all new rubber parts.

When you rebuild the MC, make sure that teeny tiny return hole in the MC is not clogged. (Mine had all kinds of gunk in it.)

Thanks for the tip on what's exactly in #1, my pistons are pitted and scarred, so I need #1 and #14.

[londonboards]

If they look anything like this, they are goosed (thank you Tatu):



Get some new ones:



You can get them here:

Ebay Shop Sirius

I found this Canadian parts company quick and cheaper than my supplier in the UK.

Greetings

[allojohn]

You might want to consider Stainless steel pistons and never ever worry about pitting again. You can get them here.