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Brake Test fail

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Alexm1:
Kobus, thanks for the response.
The battery voltage I referenced is taken with a fluke meter at the battery. The other two are taken from reports generated via the GS 911, one on the engine and the other on the ABS, CSV logs of each.
As indicated, no error codes, so I don't actually have a problem yet. I went for a ride today and all is well.
I plan to bleed both the wheel circuits and the control circuit this weekend and clean the electrical connections, with luck that will solve it.
I will post an update once complete.
Thanks again for the interest, much appreciated.

Roddos:
Hi Alex

As you say this may be a "software feature" between the Gs911 and ABS ECU.

Would be helpful if others could check and report the voltage shown in the ABS ECU through their GS911
and report back  ;)

Alexm1:
Just an update; reading the I BMW forum last night noticed that people commented on how hard they had to pull the brake lever (or push for the foot brake) to the extent that they felt the lever may break when performing the bleed test. So, armed with this new knowledge I re-did the test this morning; both front and rear turned green, front passed the test, rear would not get high enough pressure but did move well to the right on the graph.
It would seem that the voltage issue is a red herring. I will bleed the control and wheel circuits anyway and clean the connections that I can access. Will update further at that time.

kobus:
Yup, while implementing the bleed tests, I developed some serious forearm muscles. ;D
But this is on par with the official BMW tool.

Alexm1:
So, have completed a full brake service. Bled the front and rear wheel circuits and the front and rear control circuits. Everything works as it should.
While I was at the control module I removed and cleaned the electrical plug with CRC. (The contacts were clean before I started so it was not actually necessary.)
When I connect the gs911 and check the battery voltage on the engine tests it is just below 14 volts, engine running, when I check the battery voltage on the ABS tests it shows 11.1 volts or less, engine running.
I also redid the brake tests with the gs911, the front passes with no issues, (says adequately bled) the rear will turn green and the line moves into the second division but will not move all the way to the right, the report says insufficient pressure.
Following the tests I get an error code on the front and the rear indicating over pressure in the control module ( greater than 5.5 bar), I assume this is normal, it clears and does not come back so it is the tests that cause it.
Any one experienced the voltage issue or have thoughts on the rear brake not getting high enough pressure?

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