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-   -   Anyone Changed Brake Fluid & Bled With VCDS (https://forum.a8parts.co.uk/showthread.php?t=13985)

steamship 29th March 2018 07:56 PM

Anyone Changed Brake Fluid & Bled With VCDS
 
Pretty much as the title implies. The car is coming up for its MOT in a few weeks time, and in the process of doing other stuff, I was thinking of replacing the brake fluid, as it was last changed about four years ago.

Has anyone done this themselves, and if so, how? There is an option within VCDS to bleed the brakes, but I've never used it, so not sure what it involves.

Just wondering how much brake fluid I'll need to completely flush out the existing stuff.

Regulus 29th March 2018 10:05 PM

1 Attachment(s)
I haven't done this myself. But as far as I can discover.

http://www.audipages.com/Tech_Articl...rakebleed.html seems to suggest 1 liter.

According to my workshop manual, see attached file

MikkiJayne 29th March 2018 10:38 PM

Yeah a litre should do it.

VCDS is only needed to cycle the ESP pump if the system has been opened in that area or drained. For a straight fluid change it doesn't need to be done. The sequence is different for cars with ESP though:

1 - rear left
2 - front right
3 - rear right
4 - front left

steamship 30th March 2018 01:16 PM

Quote:

Originally Posted by Regulus (Post 139531)
I haven't done this myself. But as far as I can discover.

http://www.audipages.com/Tech_Articl...rakebleed.html seems to suggest 1 liter.

Thanks for that link. Just read it and it seems reasonably easy.

Quote:

Originally Posted by MikkiJayne (Post 139533)
Yeah a litre should do it.

VCDS is only needed to cycle the ESP pump if the system has been opened in that area or drained. For a straight fluid change it doesn't need to be done. The sequence is different for cars with ESP though:

1 - rear left
2 - front right
3 - rear right
4 - front left

The link that Regulus gave mentions doing the front left first because it has the shortest run. If I just substitute the order you've given instead, that should be okay? From what it says, it just seems to be the quickest way to drain the reservoir to the lowest level.

MikkiJayne 30th March 2018 01:39 PM

In terms of draining the reservoir, the length of the pipe doesn't matter - you've got the same volume of fluid going through it whether its an inch long or ten feet :)

The shortest first logic to bleed the system makes sense because any air from the master cylinder or ABS module will come out sooner. Elsawin does give the two specific procedures though - with and without ESP.

Personally I think it makes no difference either way for a fluid change :D

steamship 30th March 2018 01:48 PM

Quote:

Originally Posted by MikkiJayne (Post 139549)
Elsawin does give the two specific procedures though - with and without ESP.

Personally I think it makes no difference either way for a fluid change :D

Great. I shall delve into that as well for instructions.

mattylondon 30th March 2018 02:01 PM

Hi Sean, there's something in the back of my mind regarding performing output tests on the D3's ABS module that it logs an error that can't be erased. I remember Snapdragon posting something about it.

Regulus 30th March 2018 02:09 PM

4 Attachment(s)
Here is what I have on the ESP procedure.

MJ is correct of course, as always :)

mattylondon 30th March 2018 02:14 PM

Ignore my comment, just now realised it's your D2. +++

Conan_the_Librarian 30th March 2018 02:32 PM

You might also invest in one of these. Makes it all so easy.

www.toolstation.com/shop/p82378?r=googleshopping&rr=marin&utm_source=google shopping&utm_medium=feed&utm_campaign=googleshoppi ngfeed&gclid=CjwKCAjwwPfVBRBiEiwAdkM0HWaBrZq_vk_5z 6YnW5ItnP0DpUIJgGZjRYDDeoDnntJszSWd4YNLyRoC1J4QAvD _BwE


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