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1980 Z750 brake
Topic Started: May 14 2018, 07:01 AM (98 Views)
DavidC
50+Member
[ *  *  * ]
The brakes weren't great on my Z750E, so I replaced the 38 yr old lines with HEL lines and new caliper piston seals and dust caps.
The brakes were worse, so I put in a master cylinder overhaul kit.
I noticed that there was some corrosion in the bore of the master cylinder, measuring it- it looked like it would miss eth travel area of teh 2 piston seals- so I
polished it and rebuilt.
The lever pressure was poor, but usable.

I couldn't find a good master cylinder on the net, so I went to the local scrapper and got a couple of seemingly suitable master cylinders - 1 from a Honda hornet and 1 from a yamaha MT09

I tried the Honda first ( it has the correct thread for the mirror) and could get no real pressure from it- even after G clamping the pistons back and bleeding it to death.
It then used the MT09 unit - this is a brembo master cylinder and got pretty much the same result.

I then hung a single caliper on a short brake line directly off the master cylinder outlet on both the yamaha and honda units- no real pressure
I replaced the original over hauled cylinder and a single caliper and the lever came back to near normal.

I then carefully replaced all brake lines and with good copper washers and leaving the tee piece loose- bled it as far as possible- the lever is now usable again.

Is it possible that the piston displacement on the honda and yamaha master cylinders are just not pumping enough fluid per stroke?

Do I coincidentally have 2 faulty master cylinders.

Has anyone fitted a modern master cylinder successfully to a Z750E or L or GPZ

Thanks

David C

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