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It looks like my power issues and no communication issue to CAN were all related to corroded wiring in the drivers side trunk area, we found the wiring to be literally crumbling once moved which was possibly as a result of a leak 18months ago. Once the wires were trimmed back and connected all power was restored. I still have my original elrctronic brake issue but that should be easily resolved now the car has power and is starting 😃 below is the link I found that lead me to the source of the issue and hopefully is will save someone else a lot of effort and time if they have the same or similar issues https://www.audiworld.com/forums/vag-com-discussion-51/b8-chasing-intermittent-codes-can-failures-no-crank-no-start-inspect-splice-2973994/

Hello fellow Audi drivers! Picked myself up a B8 S4 a couple months ago and loving it. Had a B6 1.8 T-sport before that as a run around (1st Audi) and actually really liked it! Ive always been a 90’s/00’s Japanese car man, but they have nearly all rotted away, and the ones that haven’t are well over priced now. 🚘 PFA 😁

Now that’s what I call detailing! Nice colours too.

Lovely colour combo! 👍

Did have an imported Nissan Pulsar GTiR for a while! Looked pretty mean so just had boost adjusted to 280 bhp.

Welcome to the forum you'll find the members on here are a friendly and helpful bunch ☺️ great looking Audi a d great back drop. My brother is into his jap cars abd gas a modified Suzuki swift 🙂

Here is the old one btw..

Hi all, firstly thanks to all for their contributions on this thread to help highlight and fix this very serious issue. Some background information. I am based in Ireland and in 2017 bought a new A5 coupe 190bhp 2.0 TDi from an Audi main dealer here - this car has always been serviced through this dealer. With regard to this brake servo restricted issue I have been more fortunate than others and their experiences. The warning message first appeared in September 2021 (though with no accompanying start / stop function warning). However, this fault message disappeared after a few days and had been intermittent over the following weeks leading me to believe there was a loose connection somewhere. In early December the warning appeared again along with the stop / start function warning. Not realising the significance of continuing to drive with these warnings thankfully I only did limited mileage (this not by design) and yesterday I finally "googled" the issue. It was only through this forum / thread did I realise the potential to cause damage to the ABS system with a possible repair bill of €4,000+. So as of yesterday evening I stopped driving the A5 and this morning I rang my local Audi dealer to order the brake pressure sensor hoping they would have a unit in stock. They did (cost = €107) and all I had to do was mention the part and the guy knew exactly the part number I required - so obviously a wide spread issue with Audi ! It took less than 5 minutes to change out the old sensor for the new and on starting the warnings were gone with standard brake foot pedal pressure restored. My advice is similar to others on this thread - don't ignore the warning and you can easily replace the sensor yourself without resorting to Audi garage for high labour and diagnostic review costs. Thanks again to all the contributors here ...........