Notices
928 Forum
Sponsored by:
Sponsored by: 928 Specialists

PSD leaking (see pic)

 
Old 02-11-2019, 10:34 PM
  #1  
EMan 928
Addict
Rennlist Member
Thread Starter
 
EMan 928's Avatar
 
Join Date: Oct 2006
Location: Oakland, MI
Posts: 1,342
Default PSD leaking (see pic)

Hi all,

91 S4 (Turq) has a leaky PSD fitting. Tried tightening the fittings and still getting some weeping - I think where the smaller fitting on the right side goes into the larger fitting in the left side.

Does this require some loc-tite or other sealant? Or do I need to get some new fittings?
Attached Images  
EMan 928 is offline  
Old 02-11-2019, 10:44 PM
  #2  
928sg
Resident 928 Modiholic
Rennlist Member
 
928sg's Avatar
 
Join Date: Mar 2013
Posts: 1,989
Default

looks like someone replaced the factory line with copper?
928sg is online now  
Old 02-11-2019, 11:12 PM
  #3  
Kevin in Atlanta
Addict
Rennlist Member
 
Join Date: May 2002
Location: Roswell, GA
Posts: 5,149
Default

Where is that connection? Slave?
Kevin in Atlanta is online now  
Old 02-11-2019, 11:16 PM
  #4  
EMan 928
Addict
Rennlist Member
Thread Starter
 
EMan 928's Avatar
 
Join Date: Oct 2006
Location: Oakland, MI
Posts: 1,342
Default

Originally Posted by Kevin in Atlanta
Where is that connection? Slave?
Right in front of the gas tank.
EMan 928 is offline  
Old 02-12-2019, 01:01 AM
  #5  
NoVector
Addict
Rennlist Member
 
NoVector's Avatar
 
Join Date: Oct 2004
Location: Central Texas
Posts: 2,381
Default

That's your pressure valve. This picture may help; it shows the line as it connects to the valve. At the other end of that line is the PSD slave cylinder. I'm not sure where yours is leaking though. Is it in the middle of the valve or where the slave cylinder line threads into the pressure valve?





NoVector is offline  
Old 02-12-2019, 09:02 AM
  #6  
worf928
Addict
Rennlist Member
 
worf928's Avatar
 
Join Date: Oct 2003
Location: New England
Posts: 12,090
Default

NoVector is correct —^

New check valves are still available. Not sure about the line to the slave.

Looks to me like it’s leaking at the fitting for the OE copper hard-line to the slave. If you’ve attempted to tighten this with the ‘two-wrench squeeze’ method and it’s still leaking then it’s likely you’ll need to replace one or both of the valve or hard-line. There’s probably a brake-fluid resistant Loctite sealant you could try. Would need to dig through the Loctite site.
worf928 is offline  
Old 02-12-2019, 09:27 AM
  #7  
NoVector
Addict
Rennlist Member
 
NoVector's Avatar
 
Join Date: Oct 2004
Location: Central Texas
Posts: 2,381
Default

Here's a picture of the "two-wrench squeeze"

NoVector is offline  
Old 02-12-2019, 09:31 AM
  #8  
worf928
Addict
Rennlist Member
 
worf928's Avatar
 
Join Date: Oct 2003
Location: New England
Posts: 12,090
Default

Nice picture —-^ Ideally you’d use flare wrenches. More important for the little 11mm fitting on the hard line. The check valve ‘can take it.’
worf928 is offline  
Old 02-12-2019, 09:33 AM
  #9  
worf928
Addict
Rennlist Member
 
worf928's Avatar
 
Join Date: Oct 2003
Location: New England
Posts: 12,090
Default

Eric, what happened in this area of the car just prior to the leak?
worf928 is offline  
Old 02-12-2019, 10:00 AM
  #10  
NoVector
Addict
Rennlist Member
 
NoVector's Avatar
 
Join Date: Oct 2004
Location: Central Texas
Posts: 2,381
Default

Originally Posted by worf928 View Post
Nice picture —-^ Ideally you’d use flare wrenches. More important for the little 11mm fitting on the hard line. The check valve ‘can take it.’
Absolutely correct. This was before I learned the lesson of a quality 11-mm flare wrench for swapping-out or bleeding the PSD. Pretty much anything PSD related.
NoVector is offline  
Old 02-13-2019, 12:28 PM
  #11  
davek9
Addict
Rennlist Member
 
davek9's Avatar
 
Join Date: Jul 2006
Location: Bloomfield, MI
Posts: 4,517
Default

Hi guys, this was pointed out to Eric by Stan when he brought that car down to Frenzy, we were changing all fluids and figured we try tightening this line up.
Yes we use flair nut wrenches, could not get any movement, and it does look like the seepage is coming from the middle of the pressure valve.

Nothing was done in this area per the original build, just driving it, it's is a blast w/ the GB stroked Eng.

With that said and what I'm reading here, it will require replacement?
I've never done one, will the PSD require a full bleed afterwords?
Is this under pressure w/out the engine running?

Thank you,

Dave K
davek9 is offline  
Old 02-13-2019, 12:34 PM
  #12  
EMan 928
Addict
Rennlist Member
Thread Starter
 
EMan 928's Avatar
 
Join Date: Oct 2006
Location: Oakland, MI
Posts: 1,342
Default

Originally Posted by worf928 View Post
Eric, what happened in this area of the car just prior to the leak?
To my knowledge, nothing unusual. Either it has leaked ever so slightly since I've had the car or it just started. Never noticed a drip on the floor. As DaveK9 mentioned, Stan saw it when it was on a lift at Frenzy.

EMan 928 is offline  
Old 02-13-2019, 01:40 PM
  #13  
GregBBRD

Rennlist
Basic Site Sponsor

 
GregBBRD's Avatar
 
Join Date: Feb 2005
Location: Anaheim
Posts: 9,790
Default

The great thing about fixing 928's, right now, is that a huge majority of the parts still exist.

It's not uncommon for the valves to seep.

If in doubt, order a new valve and a new line.
GregBBRD is offline  
Old 02-13-2019, 01:42 PM
  #14  
worf928
Addict
Rennlist Member
 
worf928's Avatar
 
Join Date: Oct 2003
Location: New England
Posts: 12,090
Default

Originally Posted by EMan 928 View Post
To my knowledge, nothing unusual. Either it has leaked ever so slightly since I've had the car or it just started.
Cool. Always good to know what wrenches have been recently in the area before rendering opinions.

Originally Posted by davek9 View Post
... it does look like the seepage is coming from the middle of the pressure valve.

With that said and what I'm reading here, it will require replacement?
That would be where I’d start.
I've never done one, will the PSD require a full bleed afterwords?
Not a full bleed. But, with the set-up time to do the partial bleed of the slave line you might as well do the full fluid replacement (that should be done every 2-3 years anyway.)
Is this under pressure w/out the engine running?
No. Nor is it under pressure when the engine is running. It’s only pressurized when you are bleeding the slave line or when the green PSD cluster light is on.

worf928 is offline  
Old 02-13-2019, 02:03 PM
  #15  
worf928
Addict
Rennlist Member
 
worf928's Avatar
 
Join Date: Oct 2003
Location: New England
Posts: 12,090
Default

Originally Posted by worf928 View Post
No. Nor is it under pressure when the engine is running. It’s only pressurized when you are bleeding the slave line or when the green PSD cluster light is on.

Pedantically, there may be residual pressure in the lines for a while after activation, but nothing close to the super-duper operating pressure.

And with the valve leaking, likely not even trivial pressure.
worf928 is offline  

Thread Tools
Search this Thread

Contact Us - About Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: