Clutch Slave - bleed but no leak
11-03-2021, 08:10 PM
#1
Burning Brakes
Thread Starter
Clutch Slave - bleed but no leak
So this is weird. I have to bleed the clutch slave a couple times a year - but there is no leak anywhere. Anybody had, or seen that before? I have twice replaced the slave since car purchase 9 years ago - including the rubber, line, too, fwiw.
I've used the *** part. Could it be possible the seal is good enough to prevent fluid from leaking when pressing the pedal in, yet allows a minuscule amount of air through the seal upon release?? Don't know what else could explain this funky situation.
Brandon
'91 Turbo
I've used the *** part. Could it be possible the seal is good enough to prevent fluid from leaking when pressing the pedal in, yet allows a minuscule amount of air through the seal upon release?? Don't know what else could explain this funky situation.
Brandon
'91 Turbo
01-26-2022, 02:14 AM
#3
Burning Brakes
Thread Starter
Circling back on this. Sometimes the clutch doesn't fully return also. Just going to throw everything at it. Just because.
-Almost have pedal assembly out - will replace all bushings and the clutch roll pin.
-replacing master cylinder with OE
-replacing that line in back with an upgraded braided line from FVD
-replacing the slave with a sexy CNC piece made by Montage (getting at TurboKraft) - it has a bigger bore - offers easier actuation (mine (Sachs Sport I think) is on the stiff side) and better modulation
Brandon
'91 Turbo
-Almost have pedal assembly out - will replace all bushings and the clutch roll pin.
-replacing master cylinder with OE
-replacing that line in back with an upgraded braided line from FVD
-replacing the slave with a sexy CNC piece made by Montage (getting at TurboKraft) - it has a bigger bore - offers easier actuation (mine (Sachs Sport I think) is on the stiff side) and better modulation
Brandon
'91 Turbo
01-26-2022, 10:03 AM
#4
There is an upgrade for the clutch pedal to stop the issue with not returning all the way to top
and some people have used 993 parts
Search the N/A 964 forum
FYI, mine does this too and with the heavy Sachs PP I'm looking to fix next
and some people have used 993 parts
Search the N/A 964 forum
FYI, mine does this too and with the heavy Sachs PP I'm looking to fix next
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Metal Guru (01-28-2022)
01-27-2022, 12:14 AM
#6
Burning Brakes
Thread Starter
Here's what Chris says about it:
We have imported the ones made by that company that supplies hydraulic cylinders to Ducati. That company owner has a RS-spec 964, didn't like how stiff the clutch was, so... he made a master cylinder kit. It's a larger bore, so you end up with more pedal stroke and less effort to get the same amount of clutch release. A lot of owners like it, reporting it's not only lighter effort, but easier to modulate the engagement/disengagement -- especially helpful in hilly areas.
You disassemble the stock one and cannibalize seal & spring parts to assemble the new one -- why they didn't make a fully bolt-in one, we don't know (not enough market size?) but it's a pretty easy DIY task.
It's $395.
Re: 993 - yes MC is superseded by 993 part.
We don't need a Bosch Hammer to bleed the '91's do we? Just normal (pinch off the overflow)- use a power bleeder, right?
Brandon
'91 Turbo
We have imported the ones made by that company that supplies hydraulic cylinders to Ducati. That company owner has a RS-spec 964, didn't like how stiff the clutch was, so... he made a master cylinder kit. It's a larger bore, so you end up with more pedal stroke and less effort to get the same amount of clutch release. A lot of owners like it, reporting it's not only lighter effort, but easier to modulate the engagement/disengagement -- especially helpful in hilly areas.
You disassemble the stock one and cannibalize seal & spring parts to assemble the new one -- why they didn't make a fully bolt-in one, we don't know (not enough market size?) but it's a pretty easy DIY task.
It's $395.
Re: 993 - yes MC is superseded by 993 part.
We don't need a Bosch Hammer to bleed the '91's do we? Just normal (pinch off the overflow)- use a power bleeder, right?
Brandon
'91 Turbo
01-28-2022, 11:21 AM
#7
Brandon, I think Paul ordered the German CNC slave and it did not work on. 964 turbo - it does work on 964 N/A . The name of the company was MPL.
https://type911shop.co.uk/911-1987-8...ve-Cylinder-MP
If the company is the same maybe they addressed the issue ?
TurboKraft know their stuff ....
https://type911shop.co.uk/911-1987-8...ve-Cylinder-MP
If the company is the same maybe they addressed the issue ?
TurboKraft know their stuff ....
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01-31-2022, 01:36 PM
#11
Hi Brandon,
Send it back if you're not comfortable trying, no problem at all.
When we have had both in the shop at the same time, 1989- non-turbo G50 slave cylinders as well as a 1994 Turbo with a blown out slave cylinder, I couldn't see a single difference between the two parts. Same casting, same bore, same rod length, etc. I suppose it is possible someone had installed a non-turbo slave cylinder on the '94 Turbo 3.6, but I don't think so. And when I looked it up in a manufacturer's catalog years ago. they had the same bore size listed in the specs.
The clutch release forks are the same N/A vs. Turbo, as are the release bearings, and the pressure plates are interchangeable with regards to dimensions. So the necessary amount of stroke to release the clutch would be the same as well.
I can't see why this master cylinder wouldn't work?
If it doesn't, I'm glad to learn why not.
Send it back if you're not comfortable trying, no problem at all.
When we have had both in the shop at the same time, 1989- non-turbo G50 slave cylinders as well as a 1994 Turbo with a blown out slave cylinder, I couldn't see a single difference between the two parts. Same casting, same bore, same rod length, etc. I suppose it is possible someone had installed a non-turbo slave cylinder on the '94 Turbo 3.6, but I don't think so. And when I looked it up in a manufacturer's catalog years ago. they had the same bore size listed in the specs.
The clutch release forks are the same N/A vs. Turbo, as are the release bearings, and the pressure plates are interchangeable with regards to dimensions. So the necessary amount of stroke to release the clutch would be the same as well.
I can't see why this master cylinder wouldn't work?
If it doesn't, I'm glad to learn why not.
01-31-2022, 05:12 PM
#13
Hi Brandon,
Send it back if you're not comfortable trying, no problem at all.
When we have had both in the shop at the same time, 1989- non-turbo G50 slave cylinders as well as a 1994 Turbo with a blown out slave cylinder, I couldn't see a single difference between the two parts. Same casting, same bore, same rod length, etc. I suppose it is possible someone had installed a non-turbo slave cylinder on the '94 Turbo 3.6, but I don't think so. And when I looked it up in a manufacturer's catalog years ago. they had the same bore size listed in the specs.
The clutch release forks are the same N/A vs. Turbo, as are the release bearings, and the pressure plates are interchangeable with regards to dimensions. So the necessary amount of stroke to release the clutch would be the same as well.
I can't see why this master cylinder wouldn't work?
If it doesn't, I'm glad to learn why not.
Send it back if you're not comfortable trying, no problem at all.
When we have had both in the shop at the same time, 1989- non-turbo G50 slave cylinders as well as a 1994 Turbo with a blown out slave cylinder, I couldn't see a single difference between the two parts. Same casting, same bore, same rod length, etc. I suppose it is possible someone had installed a non-turbo slave cylinder on the '94 Turbo 3.6, but I don't think so. And when I looked it up in a manufacturer's catalog years ago. they had the same bore size listed in the specs.
The clutch release forks are the same N/A vs. Turbo, as are the release bearings, and the pressure plates are interchangeable with regards to dimensions. So the necessary amount of stroke to release the clutch would be the same as well.
I can't see why this master cylinder wouldn't work?
If it doesn't, I'm glad to learn why not.