Can this PSD slave be reconstituted?
#1
Rennlist Member
Thread Starter
Can this PSD slave be reconstituted?
Can a PSD slave be reconstituted? I just removed it from the car—bone dry. I have no idea the last time it’s had brake fluid in it—the PSD has not worked since I’ve owned the car (3 years).
I’m thinking of sitting it in brake fluid overnight but is there a way to bench test a slave and check for leaks? A new PSD slave is around $400 and there is no rebuild kit, my first choice is to see if this one works AND make sure it doesn’t leak brake fluid into the transaxle. And should I spray WD 40 or put some kind of grease in the bore?? BTW - The bleeder screw is currently soaking in mineral spirits.
Background: Rebuilt PSD installed yesterday, internal flush worked great but, no joy flushing the line to the slave. I disconnected the control valve near the battery box. It was crammed full of crap so it’s no wonder fluid was not getting to the slave. That has now been taken apart and cleaned and the lines have been flushed. The slave is the last thing I need to sort out.
Thanks / Bruce
I’m thinking of sitting it in brake fluid overnight but is there a way to bench test a slave and check for leaks? A new PSD slave is around $400 and there is no rebuild kit, my first choice is to see if this one works AND make sure it doesn’t leak brake fluid into the transaxle. And should I spray WD 40 or put some kind of grease in the bore?? BTW - The bleeder screw is currently soaking in mineral spirits.
Background: Rebuilt PSD installed yesterday, internal flush worked great but, no joy flushing the line to the slave. I disconnected the control valve near the battery box. It was crammed full of crap so it’s no wonder fluid was not getting to the slave. That has now been taken apart and cleaned and the lines have been flushed. The slave is the last thing I need to sort out.
Thanks / Bruce
Last edited by NoVector; 09-09-2018 at 12:49 AM.
#2
Rennlist Member
Call 928 Intl and get a good used slave. $175 IIRC. No sense in pumping brake fluid into the diff and having to flush the bad fluid out. Someone hereabouts ruined a diff driving it on Nurburgring with contaminated diff grease.
Mike
Mike
#3
Rennlist Member
Thread Starter
Mike - I called Tom at 928 Intl yesterday, he said they don't have them and have never carried them (?) but said he could see a future need as the cars with PSDs are getting older.
#5
Three Wheelin'
Can a PSD slave be reconstituted? I just removed it from the car—bone dry. I have no idea the last time it’s had brake fluid in it—the PSD has not worked since I’ve owned the car (3 years).
I’m thinking of sitting it in brake fluid overnight but is there a way to bench test a slave and check for leaks? A new PSD slave is around $400 and there is no rebuild kit, my first choice is to see if this one works AND make sure it doesn’t leak brake fluid into the transaxle. And should I spray WD 40 or put some kind of grease in the bore?? BTW - The bleeder screw is currently soaking in mineral spirits.
Background: Rebuilt PSD installed yesterday, internal flush worked great but, no joy flushing the line to the slave. I disconnected the control valve near the battery box. It was crammed full of crap so it’s no wonder fluid was not getting to the slave. That has now been taken apart and cleaned and the lines have been flushed. The slave is the last thing I need to sort out.
Thanks / Bruce
I’m thinking of sitting it in brake fluid overnight but is there a way to bench test a slave and check for leaks? A new PSD slave is around $400 and there is no rebuild kit, my first choice is to see if this one works AND make sure it doesn’t leak brake fluid into the transaxle. And should I spray WD 40 or put some kind of grease in the bore?? BTW - The bleeder screw is currently soaking in mineral spirits.
Background: Rebuilt PSD installed yesterday, internal flush worked great but, no joy flushing the line to the slave. I disconnected the control valve near the battery box. It was crammed full of crap so it’s no wonder fluid was not getting to the slave. That has now been taken apart and cleaned and the lines have been flushed. The slave is the last thing I need to sort out.
Thanks / Bruce
Yes let us know who did it for you I know Roger has somebody here that does it for him. I have a couple of PSD units on hand my self and I'm interested to learn what can be done to obtain a spare slave or in case where the cylinder walls are not pitted which seal kit is available or comparable
#7
Rennlist Member
Here's a German PSD rebuilder that I stumbled across a while back ... http://www.stein-aviation.de/html/psd_engl.html
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#8
Rennlist Member
Thread Starter
^^^ That's him, Harald Stein. I stumbled on his name from John Speake's website and then Arnoud PM'd me and highly recommended him. Super fast, excellent work and communication throughout the process. Had it back to me in a week and he has a 2 year warranty. He speaks excellent English too. The only drag, he had to use an external filter until the tank with the built in filter is available again--but no biggie, it seems to work fine. I would use DHL to send it to him; it works like a champ here.
Thanks Mark - Calling now. [Edit: left voice mail.] / Bruce
Thanks Mark - Calling now. [Edit: left voice mail.] / Bruce
#9
Three Wheelin'
^^^ That's him, Harald Stein. I stumbled on his name from John Speake's website and then Arnoud PM'd me and highly recommended him. Super fast, excellent work and communication throughout the process. Had it back to me in a week and he has a 2 year warranty. He speaks excellent English too. The only drag, he had to use an external filter until the tank with the built in filter is available again.
Thanks Mark - Calling now. / Bruce
Thanks Mark - Calling now. / Bruce
#10
Rennlist Member
Thread Starter
Herman - Harald removed the old filter and did an excellent job cleaning up the old tank. Here you can see the external filter.
I noticed playing around with mine before I sent it to him, I think it would be possible to drop a wire into the tank and loop it under the filter and "pop" it out.
I noticed playing around with mine before I sent it to him, I think it would be possible to drop a wire into the tank and loop it under the filter and "pop" it out.
Last edited by NoVector; 09-09-2018 at 12:49 AM.
#11
Rennlist Member
Thread Starter
BTW - How does a PSD relieve pressure? After opening the pressure valve and seeing how it's made (pictuure #5 in the OP), I was thinking it acted like a check valve where fluid could only flow one way. But if that was the case, how would it relieve pressure and allow the slave piston to return? So if fluid does flow both ways, what is the purpose of the pressure valve??
#12
Three Wheelin'
Herman - Harald removed the old filter and did an excellent job cleaning up the old tank. Here you can see the external filter.
I noticed playing around with mine before I sent it to him, I think it would be possible to drop a wire into the tank and loop it under the filter and "pop" it out.
I noticed playing around with mine before I sent it to him, I think it would be possible to drop a wire into the tank and loop it under the filter and "pop" it out.
#13
Addict
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There is one more plastic piece included in the valve which is not shown in picture. Its probably still inside one of the housing pieces. Happen to have its orientation shown in picture? I'm doing PSd rebuild on friends '90 GT and would like to make sure pressure valve goes back together in correct order.
#14
Drifting
The PSD slave is very similar to the clutch slave on manual transmission cars. There used to be a rebuilding (rubber seals) kit for the clutch slave. Unfortunately, the clutch slave is slightly larger than the PSD slave, so those seals won't work.
#15
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928sRus represents Harald in the USA and hold rebuilt units here for instant sale.
__________________
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."