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I originally started off with my engine management light coming on, but initially engine was running fine and no issue with brakes. Eventually engine started to run lumpy and after 15 minutes driving I had no brakes I made contact on here and a few guys pointed me in the direction of a vacuum leak on the brake servo system. After a lengthy strip down as this stuff is well buried I eventually got to the offending part that's failed. It looks like the Vacuum pump/valve has come apart. As usual, no parts available from Audi so I'm hoping someone can point me in the right direction to source a replacement one. I have no idea of the part number for this item, if someone has the part number, then I can maybe look and see whats available. As always, any help you guys can provide is greatly appreciated.

Pick up one from Audi 2 weeks ago. PN is 058133753D

Loads on Autodoc, too.

Unit 20 replaced mine a while back. Bloody scary when you apply the brakes and absolutely no response.

Also had a similar problem when a rear caliper seized.
Car drove normally for about a hour or so.
Then brakes would fail.
The seized caliper was causing the brake fluid to overheat and the brakes to fail.

It's a common problem. And a bugger to get at.

Thanks again Gents, you never let me down, I'll check with Audi on Monday. Regards

I have experienced this twice and then it doesn't do it again for weeks, was struggling to diagnose but this has helped a lot thanks!