BierBurner

Hey guys,

I have recently done a brake upgrade on my TT 225 Q. I replaced the Rotors, Pads, and added SS lines. I also Completely drained the system manually with a Motive power bleeder and then filled it back up with Motul. I also painted the calipers.

So when I reassembled everything I made sure to bleed the brakes in the correct order and thoroughly. My first attempted was poor, at best. Peddle hit the floor and I had to pump it to get any pressure. I took it for a spin, the ESP light came on and stayed on after the second stop. So I pulled it back into the garage. Did a second Power bleed. Still the same results.

Now I read farther into the Bentley and did the ABS power bleed procedure where it manually runs the pump. I did this and had better results. However, still not full peddle pressure.
So at this point I gave up and decided to take it into the dealer.

I spend 2 hrs at the dealer, when finally the service manager comes up to me and says the tech can't get it to bleed either. So I go and talk to the tech. First question I ask him was how did you bleed the brakes. Keep in mind the Tech is even younger than I am(26). So he says, I just power bleed it. I asked with the VAG-COM procedure. He says no, just power bleed it. I asked him why he did not use the VAG, and his remark was the service manager did not tell him I replaced the lines. Any tech with powers of observation would have seen the bright SS lines.
Anyhow, they go to hook up the computer and they can't communicate with the car. Nothing, no nothing. They are getting an error message of voltage to low unable to connect or something of that sort. Which blew me away because not 4 days earlier I was hooked up just fine. So they trouble shot for another hr and at that point, I had enough.
So the sad point is that I left my Baby at the shop and had to ride home in the shuttle van.


Please anyone that has had experience with completely draining the brake system, any suggestions or pointers would be greatly appreciated. What should I do next if the dealer can't fix it.

Thanks you for your time,
Uriah

TT_Nuge

So you drained the old fluid before adding the new, filling the lines and system with air?

TTagz

if that will even work. no telling where air could get stuck in there.

BierBurner

In the process of picking my car up now. The Dealer said that they broke the bleeding tool. Great so now I have to wait until next week. So anyone have any suggestion until then. Should I just keep on bleeding it, while cycling the abs pump.

TT_Nuge

I would guess it would just take a lot of bleeding while running the ABS pump. If it was me I would try that and would probably rerun the fluid back through until I got rid of every bubble then put new fluid in the bleeder and run that through.

Good Luck,
Trent

TTagz

I'd keep running fluid through it, cycling the ABS pump. let it sit for a while in between bleeds though. give the air time to collect in a spot so it may be easier to push out. tap on the lines and calipers with a wrench to help move the bubbles along. I don't envy you, you've got a lot of bleeding to do, but hopefully you'll get it.

TTschwing

The whole point of the power bleeder is to force the old out and replace with new without introducing any air into the system. ATE even makes both Blue and gold fluid that you alternate every other flush so you have a visual when the old is gone. I suspect, as mentioned below, that it will take repeated flushing and cycling of the ABS system to get all the air out...

BierBurner

Thanks for the encouragement.. I will try that and see what happens.

RafaTT

I had a similar experience with Mintex Red Box, they were defective and the pedal would go to the floor as if it had air, even that I just flushed the whole system and put new fluid. This pic shows the wear on the pad with only like 5 miles on it.
<img src="http://pictureposter.audiworld.com/62820/rear-pass.jpg">

The fronts looked thesame but I had almost no brake at all. I would start looking at the pads and bleeding with the pedal (normal brake bleed method), not the power bleeder.

BierBurner

I don't think it is a problem with the Pads, Checked them out today.