britorean

2 minutes ago, Andy015626 said:

I picked it up this morning and the dealer said i was lucky to get that. Already sold 3 in the last 24hrs. They are made in China apparently so who knows when more stock will arrive.

In case it's helpful to anyone, when I ordered the part last week from Cardiff Audi (who deliver natinoally), they said they have them on their shelves. It was the latest version with B at the end of the part number.

An update from me too. I ordered the sensor (5Q0 906 207 B) from Cardiff Audi on Friday and it arrived this morning. It took a few minutes to remove the old sensor (I think I was being too careful not to break anything off) - the hardest part for me was to unhook the latch on the sides, but installing the new one was super easy.

Both brake servo and stop/start warnings disappeared immediately after the sensor was replaced.

All thanks to everyone on this thread and especially Ambrose whose posts I found extremely informative!

Obviously I'm not impressed that these parts are failing in the first place (or that they could lead to bigger safety problems), but I am hugely impressed by everyone on this forum coming together to help others. I would have been without a car and few thousand pounds poorer otherwise!

4 minutes ago, alo said:

Hi guys,

As promised, here is a short video of how to replace the Brake servo sensor of an Audi A4 B9.  Not the best or clearest video, but I hope it helps.

Let me know if you have any questions.

Ambrose

This is so helpful and amazing, thank you so much Ambrose! What a legend. 

On 6/9/2021 at 10:17 AM, alo said:

Hi all,

I had the same issue where the brake servo and stop start error appeared.  After reading this helpful thread, I thought I would do my part to help out too. 🙂

Issue stared on the 5th June 2021 and it was fixed on the 9th June 2021.  The car has been driven for approx. 100 miles during this time.

I've called up Cardiff Audi and fortunately they have one sensor left in stock.  Please note that 5Q 0906207, 5Q 0906207A, 5Q 0906207B are all cross compatible as confirmed by Audi parts department.  But of course best to get the latest B version if available.  Please note VW, Seat & Sokda all share the same part and I've checked with my local dealerships and they are all the same price £79.60.  I've managed to get it down to £76 at Cardiff Audi.  If unavailable, usually you can order it and it takes a day to arrive if ordered by mid-day.

Installation will take less than 5 mins if you are unfamiliar with the car.  I have enclosed a print screen of the Audi A4 Shop manual. Link are here: https://cardiagn.com/audi-a4-b9-8w-brake-system/ Page 146.  I can do a simple video to demonstrate this if anyone wanted.

One thing to be noted is when you unplugged the sensor, some pressure will be released from the hole.

I've asked Cardiff Audi whether this falls part of the recall part and they said no.  But they've done a few of these jobs and knew about the issue.

I hope the above helps.

Kind regards,

Ambrose

 

I had the "Brake Servo Restricted" message come up on my '16 A4 on Wednesday, and having come across this amazing thread in time, I have ordered the replacement brake servo sensor. Hopefully it gets here soon!

I don't really know my way around the car's bonnet, though, and if anyone is able to do a short video showing how to unclasp the existing sensor (I don't want to break anything off!!) then it would be so much appreciated.