Brake Problems - 1982 Kawasaki GPZ 550 H2

[Cerbera]

Hi everybody, this my first post so go easy on me!
I am looking for any advice on a problem I'm having with a restoration project.
I am rebuilding a 1982 Kawasaki GPZ 550 H2. We're having difficulties with the front brakes. When bleeding the brakes we are unable to get a pressured lever, there is some but not enough.
The calipers have been fitted with new pistons and seals. Braided hoses are fitted and have no leaks. The original Kawasaki master cylinder seals had gone so we fitted one from a Suzuki Bandit but still unable to get a brake.

Any help with this would be appreciated.

[Kickstart]

Hi

Would think the Bandit m/c would have a sufficient bore to pump enough fluid for those 2 little single piston calipers.

Try tapping the brake lines and then pull the lever very slightly. You can sometimes get a lot of air out from the brake lines via the m/c and reservior. You get tiny bubbles, but sometimes enough to make a lot of difference.

Also try pulling the brake lever fully and then crack off the top banjo bolt and then do it up again. It is easy to get air trapped around the banjo bolt (often one of the highest bits of the system) and this gets it out.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[gavin]

try reverse bleeding them: connect a pipe to the bleed nipple and slowly fill the system from the nipple to the reservoir using a ezibleed pressure system or a large syringe connected to the pipe.

when you have a reservoir full of fluid close the nipple so its not quite stopping the flow and then pump the lever. it should go firm fairly quickly.

[Kickstart]

Hi

The above can work well.

Sometimes they can just be git though, and you need every trick in the book.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Jrod]

Yep, took me fu*king ages.

[Cerbera]

Thanks to all who replied
Unfortunately I have to work this weekend so we will not get a chance to try until Monday!
Thanks again, I'll keep you posted.

[mchaggis]