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Old Dec 15, 2019 | 10:36 PM
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Getting this message in 2018 a8 , Service Brake Assist. Perhaps this his been asked before, but I could not find a for sure answer. Car has big cam, but not sure if it is related.
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Old Dec 16, 2019 | 10:31 AM
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This has nothing to do with the engine - unless brake wiring was disturbed while working on the engine.

From the OWNER'S MANUAL:

Brake Assist
The Brake Assist feature is
designed to assist the driver in
stopping or decreasing vehicle
speed in emergency driving
conditions.
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Old Dec 16, 2019 | 10:42 AM
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Only thing I can think of is your big is not producing enough vacuum. The brakes are vacuum assisted and maybe the computer is reading a low vacuum situation?
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Old Dec 16, 2019 | 01:57 PM
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There is an electric vacuum pump just in front of the brake master cylinder that should kick in as needed. It's the dome shaped shiny thing!
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Old Dec 16, 2019 | 02:08 PM
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Trying to figure this out without having a code is like looking for a needle in a haystack. All Service Messages like this are generated due to a code being set, that code will tell you where to look for the problem and the specific diagnostic procedure for that code will help you isolate the problem. At least 45% of all codes that can be generated are not power train related, so, an OBD2 scan tool may not be able to read the code if the code isn't power train related. .

Bill
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Old Dec 16, 2019 | 11:58 PM
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[QUOTE=Bill Dearborn;1600656186]Trying to figure this out without having a code is like looking for a needle in a haystack. All Service Messages like this are generated due to a code being set, that code will tell you where to look for the problem and the specific diagnostic procedure for that code will help you isolate the problem. At least 45% of all codes that can be generated are not power train related, so, an OBD2 scan tool may not be able to read the code if the code isn't power train related. .



Thanks to all for responding, I will see if my tuner can find the code associated with the dic message I am seeing.
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Old Dec 19, 2019 | 01:01 PM
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[QUOTE=Tray333;1600658886]
Originally Posted by Bill Dearborn
Trying to figure this out without having a code is like looking for a needle in a haystack. All Service Messages like this are generated due to a code being set, that code will tell you where to look for the problem and the specific diagnostic procedure for that code will help you isolate the problem. At least 45% of all codes that can be generated are not power train related, so, an OBD2 scan tool may not be able to read the code if the code isn't power train related. .



Thanks to all for responding, I will see if my tuner can find the code associated with the dic message I am seeing.

I think we can help you once you have the codes
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Old Dec 19, 2019 | 01:18 PM
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Car is at shop now, and I am awaiting code scan results.
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