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D2 - Axles, Brakes, Suspension and Steering Brakes, Springs, shocks, steering racks, steering columns, suspension arms, wheel hubs etc.

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  #1  
Old 29th March 2018, 07:56 PM
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steamship steamship is offline
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Default 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.
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Old 29th March 2018, 10:05 PM
Regulus Regulus is offline
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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
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Old 29th March 2018, 10:38 PM
MikkiJayne MikkiJayne is offline
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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
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Old 30th March 2018, 01:16 PM
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steamship steamship is offline
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Quote:
Originally Posted by Regulus View Post
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 View Post
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.
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts

My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror, Chrome Boot Struts

Sold! 2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II Headlights

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Old 30th March 2018, 01:39 PM
MikkiJayne MikkiJayne is offline
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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
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Old 30th March 2018, 01:48 PM
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Quote:
Originally Posted by MikkiJayne View Post
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
Great. I shall delve into that as well for instructions.
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts

My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror, Chrome Boot Struts

Sold! 2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II Headlights

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Old 30th March 2018, 02:01 PM
mattylondon mattylondon is offline
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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.
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Old 30th March 2018, 02:09 PM
Regulus Regulus is offline
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Here is what I have on the ESP procedure.

MJ is correct of course, as always
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Old 30th March 2018, 02:14 PM
mattylondon mattylondon is offline
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Ignore my comment, just now realised it's your D2.
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Old 30th March 2018, 02:32 PM
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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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