Why do you need to replace the pistons? There should be absolutely no reason for those to go bad unless they got butchered during removal. Ive rebuilt a dozen calipers and the only thing I ever had to do was polish the pistons with a scotch bright pad. Seals is all you should ever need.

 

Based off reading the thread, it seems he needs the pistons, as the calipers he purchased don't have any pistons, which makes it difficult for him to Polish and reinstall as per your guidance....

 

Yup I did miss that. Well Id have to assume the 08 Ultra already has a functioning caliper on it, and if he is looking to have the set he picked up painted, why couldnt he use the pistons out of the functioning calipers? Id prefer to have an HD part in there if it were mine over a drag part, especially when it comes to brakes. Id also advise to go powder coat not paint, the brake fluid will eat the paint off whenever they get bled or serviced.

 

Maybe I'm overstating the obvious? ... Why not just pull your calipers off and paint them? It would be a whole lot cheaper than buying MORE parts. If you take care on disassembly ( assuming that you're not having problems with the calipers that are on your scooter ) you could even reassemble with the seals and pistons that are in the calipers now. I've done it many times successfully.

 

Those #'s you reference are NOT for Touring Brembos. They are for Softails and Dynas

 

I do have complete calipers with pistons, but did not know that the touring Brembos were different - thanks

I want the pistons simply because I do not like to do half a job if it can be avoided. I just did my old Bonnie and as you say the pistons were fine but I now know it is fine.
Money well wasted, but no point pissing about with brakes.

I see on the new that a Honda seal will fit
Are Touring and Dyna seals the same? I imagine that if the calipers are different, that difference would be in piston size
Does anyone know the piston sizes front and rear, for an 08 Road King

Now where to buy a complete kit, or even just the seals for a 08 Road King

 

QTM just advised that the complete kits and seal kits are no longer available!

 

You might be able to match up the seals at a "hydraulics" house.

Also Bumpandrun made reference to Honda seals "working" Here:
https://www.hdforums.com/forum/touri...l#post15284406

 

According to the catalogs the calipers are the same up through 2016

L/S 43027-08

R/S 44023-08

 

QTM now advise that the pistons are all the same size, but cannot tell me what that is.
That lends credence to using the Honda 32mm seals but I would really like to know for sure before I start