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      06-11-2014, 12:59 PM   #1
aoysgelt
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How do you ensure that all old brake fluid is gone?

Planning on replacing brake fluid with high performance version but - unless I use blue one - how can I tell when old fluid has been replaced?

Current thought is to
- remove old liquid from reservoir
- estimate amount of liquid in master cylinder + each brake lines/caliper
- then flush each corner keeping track of how much fluid has been added to the system. For first corner there should be at least that corner's amount plus master cylinder/etc. each other corner should just be that corner's amount.

Any other advice?

Thanks
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      06-11-2014, 02:13 PM   #2
Amirsm3
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You can tell the difference between used brake fluid and new brake fluid - regardless of the color you're using.
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      06-12-2014, 05:10 AM   #3
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You need to go to a BMW shop to replace ALL old brake fluid. The traditional pump and release method will not flush old brake fluid in the ABS module.
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      06-12-2014, 10:24 AM   #4
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Quote:
Originally Posted by FNG View Post
You need to go to a BMW shop to replace ALL old brake fluid. The traditional pump and release method will not flush old brake fluid in the ABS module.
ohhhhh I learned something new lol
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      06-12-2014, 10:57 AM   #5
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You need a pressure bleeder connected to the brake fluid reservoir
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      06-13-2014, 06:06 PM   #6
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That still won't remove old brake fluid from the ABS module.

Maybe the best solution (haven't tried it though) would be to flush using the traditional method or with a Motive Pressure Bleeder then do several panic stops on wet road to get the ABS to engage. After several stops, bleed the brake system again.
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