Z1OwnersClub GB

Hello all,

I`ve had a Harrison 4 piston caliper on my Z1R for a few years now, it never really worked that well so a while back i got a Brembo master cylinder and used silicone brake fluid, still wasn`t brilliant. I may have found out why, i now have brake fluid leaking through the gaps in the caliper halves when pulling on the lever. Do these calipers have seals between the 2 halves or are they a bare face fit? And anyone had problems using silicone brake fluid?
I don`t know if it`s down to the new caliper, the brake fluid or just general wear, i`ll be calling Harrisons to see what they think. But if anyone here has any ideas i`d be interested in hearing them, thankyou!

Andy
I have a set of Billet six pots on one of mine - they worked very well. I had another set of Harrisons I bought second hand and they leaked like a seive. I couldn't get new caliper seals because Harrison's had changed the seal supplier and changed sizes, so they had no old size seals to sell me. I've still got them under the bench the bloke I bough them off had emigrated. !! This was ages ago - I'm sure yours aren't that old. Ken Harrison doesn't run the company any nore he was bought over by another firm. It was quite a few years ago when I had those apart I'mm 99% certain they have a seal between the halves. It's possible it's the silicone that's done them in. I'm sure Rich will have a theory.

They should be good a caliper - chances are the problem was more with the master cylinder than the fluid.

Cheers Chris, i spoke to them today and they didn`t think the master cylinder or silicone fluid would be the problem, you`re right there are 2 seals in there so they suggested replacing those and torquing it up t 40 ft lb`s, hopefully that will sort it. I`ll be ordering the seals tomorrow, i`ll let you know how i get on, thanks again.

If you replace mineral with silicon the you should replace the seals as well.
Sounds like the centre seals have gone, see if you can find out what size they are. Have a word with AP or look at Tokico / Nissin seals