Brake bleeding - air lock?

[RussG]

How do you tell if the master cylinder is the correct size? I’ve never seen them advertised by size …

never had a rex but looks like standard 5/8ths

They are described as 7/8” clutch and brake levers but were cheap eBay ones and don’t specify single or twin disc in the description, wondering if I shouldn’t just buy another one from Z-Power that does say it’s for twin discs just don’t know if it’ll fix it…

[RussG]

How do you tell if the master cylinder is the correct size? I’ve never seen them advertised by size …

never had a rex but looks like standard 5/8ths

They’re 7/8ths apparently, cheap off eBay though and doesn’t say whether it’s suitable for twin discs, thinking I should perhaps fork out for one from Z-Power just to be sure…

[floydsz1]

If you change a z1 to twin disc you have to fit a bigger bore mastercylinder because it needs to push more fluid due to there being 2 calipers (more pistons) to move. You can buy various size Brembo mastercylinders (for example) depending on what calipers you are wanting to fit and what sort off feel you want.

[RussG]

So, just wanted to let you know the bigger master cylinder from Z-Power did the trick, did the back brake today as well and alls good, thanks chaps