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      02-21-2018, 09:29 AM   #1
MOTK
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Coding out DBC - dynamic brake assist

Not sure if this has been covered here before but perhaps this will be of use to some.
I find the z4m to be a pretty accomplished car on track with some mods however one thing that has always bugged me is the inconsistency that can occur with the brake pedal in certain situations.
It comes as a result of DBC, you can read about how it works here, suffice to say it can be difficult to modulate the brake when coming off the throttle very quickly.
http://www.bmw.com.kh/asia/en/insigh..._brake_control
I've looked around on the web and haven't been able to find any one who has removed it on the Z4M, so I thought I'd have a go myself. Digging around it turns out our ecu is closely related to some of the newer e6/8x models and there in lay the answers.
The function you need to set to not active is BB_RAB found in the MK60 ecu.
That's it A very nice improvement on initial tests, pedal feel consistent I can update in a few weeks after Donnington.
If you wish you can also disable hill start assist which is HSA and also the automatic brake disk dry function for when it is wet by setting TB_BDD to not active.
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      02-23-2018, 06:07 PM   #2
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Sounds like this eliminates what I call "hyper-brakes".
When I come off the throttle fast the brake sensitivity goes up by an order of magnitude.
Normally I have about 1/2-3/4" of pedal travel and then smooth braking.
In "hyper-brakes" the pedal goes about 1/4" and the brakes come on hard.
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      02-23-2018, 09:59 PM   #3
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This explains a lot.
There were times in this situation that the brakes drove me crazy they were so touchy.
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      02-24-2018, 07:00 AM   #4
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Quote:
Originally Posted by StickMon View Post
Sounds like this eliminates what I call "hyper-brakes".
When I come off the throttle fast the brake sensitivity goes up by an order of magnitude.
Normally I have about 1/2-3/4" of pedal travel and then smooth braking.
In "hyper-brakes" the pedal goes about 1/4" and the brakes come on hard.
Yes, this. Except BMW gave it a less exciting name
I can't wait to try it out on track in 2 weeks time.
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      02-24-2018, 11:49 AM   #5
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Interesting!
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