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jonno_ said:Iain - to your question, there is of course a need to periodically loosen to prevent them seizing.
That aside, I'd be surprised if there is more than perhaps 5ml in the line between the nipples on each caliper.
So a max. of 20-25ml overall = maybe less than 5% of the total in the system, and you've got to assume it gets pretty well mixed with use, so any water content will be well mixed in.
I'm also interested to understand about clutch bleeding for cooking models V turbo, turbo s and GT models.
Don't the former share the brake fluid with the clutch?
How much fluid is in that system and can you drain it? Is it worth the extra effort?
Cheers chaps!