SOHC.co.uk Forums > CB350/400

Master Cylinder Holes

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petermigreen:
Currently overhauling the front brake master cylinder, when I look in the pot, there are two holes, one is full bore and the other one seems much smaller, very small in fact, so much so that I can't tell if it's blocked.
Before I force something through it, can someone confirm that both holes should be clear/open. I'm fairly certain they should be as I seem to think the smaller one is to allow the piston to return, but don't want to force something through it if not.

Thanks, Peter.

hairygit:
Yes, they should both be clear, the smaller one is return/bypass hole, if that gets blocked it causes problems releasing the caliper piston, causing dragging/binding.

petermigreen:
Cool, thought so, just wanted to make sure.
Thanks, Peter

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