Z4M Brake Flush Fluid Volume Per Corner

[itdnwiwbp]

Has anyone ever measured the approximate volume that needs to be flushed from each corner to ensure that no old fluid remains in the system? I'm about to do my first flush on this car and I don't have the benefit of Super Blue to give me an idea. If I no one knows I'll just err on the side of caution but would prefer not to waste brake fluid, even if it isn't terribly expensive.

[BIMMERGUY91]

I would like to know this as well since I need to flush mine here soon too.

[The HACK]

Back when I had my E46, I used to alternate ATE Typ 200 (gold) and ATE SuperBlue (blue), and on that particular car, it took:

~1/2L in rear passenger
~1/3L in rear driver
~1/4L in front passgener
~1/4L in front driver

Before the color would completely change. There's some intermixing, of course. It would go from gold to green to blue. Or the other way around.

This is without draining the reservoir first with a syringe or a turkey baster. I would surmise, with draining the reservoir, it would take a lot less for the first corner. Plus I'll bet all the intermixing wastes a lot of the fresh fluid in the flush.

Now when I "flush" the MZ4 Coupe, and since I don't use ATE SuperBlue anymore, and I use a syringe to drain the reservoir first, I usually go:

1/4 rear passenger
1/4 rear driver
1/8 front passenger
1/8 front driver

For a little less than 3/4 of a liter (or 1.5 bottle of Motul). And the fronts don't really require 1/8 of a liter, pretty much crack open and within a couple of seconds the fresh fluid would be coming out. This was done between OEM fluid and Motul, which is darker...Although, it's again, hard to tell when the fluids are intermixing. But any more than that, especially when you drain the reservoir first, would be a waste.

The reservoir takes a little over 1/4 liter, so the entire flush basically takes two full bottles of Motul.

[itdnwiwbp]

Perfect! Exactly what I was looking for. Thanks so much for the response!

[itdnwiwbp]

I forgot to ask about flushing the clutch too. Is everyone else who does their own brake fluid flushes also doing the clutch and if so what volume do you estimate that part of the system holds?

[The HACK]

Clutch line is the shortest line to the reservoir, and it doesn't take much. I've never had to bleed out more than 1/8th of a liter like either of the front brakes, and even that would probably be more than necessary.

[itdnwiwbp]

Great. Thanks!