I am going to do a full fluids change on my 2005 2.2 dCi T30 that I have had for 2 years. I want to bleed the brake and clutch system to replace the fluids. Does anyone know how much is required?

Is 500 ml enough or will I need 1 l?

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Fortunately, I purchased a Gunson brake fluid tester and it shows that my brake fluid is fine so I don't need to bleed it.

I have done with 1 L. Every 2 years. Use gravity bleed or a water/soda bottle and hose.
I use the bottle method too.
https://www.youtube.com/watch?v=1wwq1Vlk4Wg
https://youtu.be/n1NvtUwfRJc?t=401

Thanks for the reply Ahto. I put some penetrating fluid on the bleed nipples to see how easy they are to open up before deciding what to do.

Does anyone know what thread is used on the bleed nipples, as I may decide to buy some brass ones? I assume the clutch slave cylinder is the same as the brake calipers.

I do not know the thread size, but maybe some parts stores can tell you.

just remember not to use vacuum to bleed the clutch. a 1L should be enough.