how much brake fluid?

Well I can’t find any documentation but 2.5 - 3 litres should be more than enough but what I did was for price and compatibility sake was buy 5 litres of Renault fluid for £24 which was a good job because I used about 2.5 litres bleeding the clutch with a pressure bleeder as I failed to click it fully home after, I could not get a good grip on the connector to push and hold the wire securing clip as well. It was between getting more containers to stop the spill or spill and work on the connector also between times I had pumped the pedal not knowing I was still filling the container it's not easy to judge as well as being rotated 45Deg and fixed to what would be comfortable to work with.
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What you don't want is run out with it half done.