TomF

Do you have the bleeding procedure that you can share? I might need it in the future.

Thanks,
TomF

mcbit

After mine went the first time, the updated replacements failed a further 2 times within 2 months with the Porsche supplied parts being replaced under warranty on each occasion. On the first occasion the pipe failed at idle in traffic and on the subsequent occurrences it happened whilst pushing hard on the same sweeping right hander. I've had a borrowed oil distributor fitted on trial for the last couple of months with no further issues.

killer2001

Where did the replacement lines fail at? And are these the rear or front pdcc lines you are referring to?

geetee

I know there is an official bleed procedure but I just drove around town with lots of turns for 10 min. Park and top off. Repeat a couple more times and level hasn't changed after 3rd time.

TomF

Thanks. I did that with my 2009 to get most of the bubbles out, but I was looking for the procedure that Porsche uses to cycle the valve blocks. The whole procedure takes about 90 minutes from what the local dealer told me. I suspect that you need to use a PIWIS to do the procedure though...

Cheers,
TomF

killer2001

Anyone getting chassis system warning when they are taking very hard turns? Happens to me now, I'm wondering if its happening because there still might be air in the PDCC system? When I turn the car off and restart it the error is no longer present.

touareg

Interesting, this sounds like the articles I have read on braided brake lines failing do the shroud damaging them I think, that is to say the braid, and you can't inspect the lines because the braid is in the way.

killer2001

Yes, now I need to inspect my front lines as I most likely will want to replace them too.

mcbit

Mine were on the front anti-roll bar and all failed at the swage. Only on the 3rd time was there any significant oil loss.

Petza914

Based on earlier reports of the front lines failing dye to exterior abrasion, I actually took mine loose and purchased some clear heat shrink tubing that would fit over the metal threaded end, cut a section to length for the hose and shrunk it down over the braided stainless casing. I figured this would help protect the line and maintain its integrity, but this is a different type of failure where it looks like it failed internally rather than from exterior abrasion, so now I may not have accomplished anything

On the failed line you removed, what material is inside the stainless carcass - is it rubber, Teflon, or something else. The better stainless brake and power steering lines are braided stainless over Teflon with a rubber protective coating over the stainless. If the OEM lines are just rubber inside (including the upgraded replacements that have re-failed), maybe I should look at having some higher quality ones custom made with the proper construction, with the right lengths and ends on them.

killer2001

Judging from my observation it was an internal rubbing issue. Not sure of the material inside (I'd lean towards teflon), but possibly the internal hose expanded to the point where it was constantly touching the stainless braided portion, and this internal friction along with the heat/pressure caused the brown spots. This in turn will eventually lead to a burst. I'm going to check my front lines for any of these visual brown marks and if I see them, going to replace the lines immediately.

Petza914

Maybe you could cut through one of the replaced ones with some diagonals and let us know what the internal construction looks like.

killer2001

I suppose, I'll have to dig through my trash cans, trash goes out tomorrow so they should still be in there... somewhere... lol

killer2001

As expected, the line was split on the inside. Looks like PTFE hose material, definitely not rubber. Either way, too thin for my tastes. Although PTFE should be adequate for this application? Maybe we ended up getting a poor quality PTFE from the factory, who knows. Perhaps these lines see a bit more heat and pressure than engineered for.

Petza914

Thanks for the extra effort and pic.