I have search up and down since last night, but I can't find a seal kit only. They sell the seals with the pistons at a steep price.
Although it might be worth doing new pistons $157.80 per caliper, that is insanely crazy. This is to fix the brake feel, but maybe not a sure thing or only temporary fix.
Is this the only way???
Triumph PISTON & SEAL KIT, CALIPER Part # T2021458
Thinking furthermore, if the pistons are dirty and not sliding freely, the brake pad would have uneven wear. I can't believe, that they all went bad at the same time, so inclined to think it is the ABS system.
Ok, today (6/10/19) I bleed slowly all again, shook the braided line just in case, but to no avail. The issue is still present even with the bike off. So, it can't be the ABS acting, plus ABS can be disable temporarily; therefore not having any input on the braking system.
I pressed the brakes at the same time feeling with my finger the brake pads and you can feel the piston retracting almost immediately. I am going to bite the bullet and rebuild the 2K miles calipers and replace pads too. After, if no solution, I will take to a lawyer and weigh the options depending on the advise. This is total BS on a $15K bike. My 1988 Honda Hurricane has better brake FEEL, as well as the 2004 GSXR.
Yes, the S3R brakes better, but the scare factor is not worth it.