Rear brake sizes

[Gearhead24]

Hello,

I'm looking through brakecrafters website for caliper rebuild kits and pads, but cannot fins anything specific for the rear brakes. Is this because for the standard model F6C the brake pads and calipers are all the same?
Going for a rebuild and pad replacement on all 3 brakes
My front right caliper leaks like a madman and was filthy so I cleaned it up for now. Front left is good and has no issues, the bike also does not pull in any direction when braking so the front right is not in immediate danger.
After putting almost the whole bike back together I noticed the rear brake felt weird. The pedal is stiff to move and needs some working to get it to move smooth enough to trust it. Even when the pedal starts moving sort of normally there is a lot of resistance felt on the bike. It's not as fast and feels like it's being held back. Front brake handle feels fine to pull and it's very noticeable when only one finger is pulling the handle, so feeling confident in the fronts along with the sketchy pedal leads me to believe the rear brake is at fault here.
I've got 6 into 6 straight pipes on so I cannot hear anything else but that, no idea if the rear brake is making noise. My idea for a temp fix was to introduce air into the rear brake, try to push the pistons back, flush the fluid, then fill and bleed.

[Hook#3287]

Whenever I rebuild a caliper, I use OEM parts available from any of the parts sellers.

Obviously, the two front calipers use the same parts,  rears are different and I/s rears being different than standards or Tourers rear calipers, I believe.

You can use I/S rear pads, which used to be less $ last time I looked, with slight modification, in all calipers.

Doesn't cost much unless you need cylinders.

[Gearhead24]

Thats the thing, I cant trust my rear brake anymore and with one of my fronts being bad I decided to do a complete rebuild on all 3. I couldn't find rebuild kits especially ones with pistons anywhere else but brake crafters, and they didn't have anything for the rear specifically. If I get everything through them I would have to order another kit and pad set for the front and use it on the rear. My bike is a standard model, not an interstate, and not a tourer.

[Hook#3287]

You should consult the parts fiche at Partzilla or Rocky Mt Parts with your year and model.

As stated, the rear calipers are different than the fronts on all Valks, I believe, so the seals and cylinders can not be interchanged.