Would like to use new seals/rubbers for the brembo calipers, does anyone know what the size pistons they have? As far as I can see it looks we have the F40 style calipers with 44/38mm pistons is that correct?

Edit: May have found it, Centric 143.03004 should be right for the fronts, anyone ever tried these (or others)?

 

I've only used oem seals for them - part no# 20.7866.00 43mm/40mm
godspeedbrakes.co.uk
modeperformance.co.uk (I use these guys)
£8 for dust seals, £4 for inner seals.

 

Thanks, even better to have original Brembo ones, just couldn't find anything around. So ours are closer then to the F50 calipers with 44/40mm, I’ll check with mode performance then.

 

As you mentioned 43mm, and centric even says the F40 ones are right, it I though it would be better to measure them to be sure. The calipers I have are 40/44mm.

 

Andre make sure the height is also correct as I have found pistons with the correct diamater but to tall.

 

Thanks for the tip. For now I will only change the seals on the front calipers, and this is only as a precaution, they have some good miles on them now.

 

I rebuilt the sticking driver side front caliper on my 1992 XJ6 using a Centric kit about a month ago and it has worked well.
Initially I had to take the piston out again because I couldn't get the dust boot on and when the piston was removed there was a 4 cm long thin sliver off of the new square seal which had been shaved off. I removed that sliver and then reiserted the piston in the caliper and it has worked well since. Getting the dust boot on was a little tricky.