Rear Caliper Rebuild?

So I noticed the rear brake requires a bit of effort on my 07 GRiSO 1100 and with 32k miles on the clock I figured it was probably time to freshen up the calipers with new seals, cleaning the pistons and fresh fluid. But googling around I can find nothing in terms of a seal kit or rebuild kit. Does anybody know if there is anything out there? What model of caliper is it anyway? I believe the fronts are a Brembo P4 30/34mm but I can't find any info on the rear.

This part of the world gummint don't like knuckle draggers playin wif brakes, so we only get to buy brand new calipers, not individual parts.

However, race shops can do what ever they like as laws don't apply to "off-road" here.

So parts won't be in a Guzzi/Aprilia/Ducati cattle dog. But Auto Race shop may have access to seals and pistons of the exact dimensions.

Plenty parts available if you know the exact type rear caliper on your GRiSO:

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There ya go.

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32k miles is no reason to change anything, mine has double  distance. Doesn't look like i need to change anything. Don't use the rear brake normally.

for anything where no seal set is, look what KTM model has them, and then in ktm spare part catalog, they sell them

When you have the caliper off the frame, pistons extended normally and not out, pads off, caliper still attached by the hose, clean the outside including the rubber and exposed pistons before you squeeze them back in.

Then do a total flush on the brake fluid.

50,000 miles on my G11 and I use my rear brake a lot.

Thanks guys. Looks like I'm getting that kit for the UK. Does anybody know the model number of the Brembo rear caliper on our bikes?

My understanding of this is that some dimwit in the US a few years ago bought a kit for Brembo master cylinder which he proceeded to instal incorrectly with the seals backward. This resulted in a failure of the brakes when he had an emergency stop shortly after completion of the rebuild.
This then resulted in the usual take no personal responsibility lawsuit against Brembo for providing the parts to the moron, which caused Brembo to withdrawn parts sales to the general public.
If I have unfairly slandered someone I am happy to be corrected but this was information provided when I was seeking some kit parts 18 months ago.