Pentosin overflow from clutch reservoir
#1
12-27-2010, 07:05 PM
Join Date: Feb 2007
Location: Virginia Beach
Posts: 167
Rep Power: 24 
Pentosin overflow from clutch reservoir
I thought I would post the experience I recently had with pentosin overflowing from the clutch reservoir. First of all, this is the second slave cylinder and accumulator that was installed less than 12 months ago. I also had the clutch reservoir assembly replaced at the same time, which was leaking pentosin. Recently, I found pentosin leaking from the reservoir once again and thought that I would being dealing with the same issues I had before. To my surprise I found that the screw-on green cap for the reservoir had swollen to the extent that it just lifted straight off the top of the reservoir thereby allowing the pentosin to leak around the cap! Would pentosin react with plastic in this manner causing it to expand? Has anybody experience this before?
FYI...the Porsche dealer does not sell the cap separately. You have to purchase the entire assembly, which costs $90+. The dealer didn't have one in stock but they did have a replacement brake cap for $8 that's the same size as the green reservoir cap. I went ahead and got one of these and cut out the center of the cap to the diameter of the green cap. It's been on the car for two months now with no leaks and no signs of reacting with the pentosin. I'm going to look for a machine shop that can make an aluminum cap to the specifications of the green cap to replace the temporary brake cap and be done with this once and for all.
FYI...the Porsche dealer does not sell the cap separately. You have to purchase the entire assembly, which costs $90+. The dealer didn't have one in stock but they did have a replacement brake cap for $8 that's the same size as the green reservoir cap. I went ahead and got one of these and cut out the center of the cap to the diameter of the green cap. It's been on the car for two months now with no leaks and no signs of reacting with the pentosin. I'm going to look for a machine shop that can make an aluminum cap to the specifications of the green cap to replace the temporary brake cap and be done with this once and for all.
#4
12-28-2010, 09:40 AM
About how many miles since the replacement?
I thought I would post the experience I recently had with pentosin overflowing from the clutch reservoir. First of all, this is the second slave cylinder and accumulator that was installed less than 12 months ago. I also had the clutch reservoir assembly replaced at the same time, which was leaking pentosin. Recently, I found pentosin leaking from the reservoir once again and thought that I would being dealing with the same issues I had before. To my surprise I found that the screw-on green cap for the reservoir had swollen to the extent that it just lifted straight off the top of the reservoir thereby allowing the pentosin to leak around the cap! Would pentosin react with plastic in this manner causing it to expand? Has anybody experience this before?
FYI...the Porsche dealer does not sell the cap separately. You have to purchase the entire assembly, which costs $90+. The dealer didn't have one in stock but they did have a replacement brake cap for $8 that's the same size as the green reservoir cap. I went ahead and got one of these and cut out the center of the cap to the diameter of the green cap. It's been on the car for two months now with no leaks and no signs of reacting with the pentosin. I'm going to look for a machine shop that can make an aluminum cap to the specifications of the green cap to replace the temporary brake cap and be done with this once and for all.
FYI...the Porsche dealer does not sell the cap separately. You have to purchase the entire assembly, which costs $90+. The dealer didn't have one in stock but they did have a replacement brake cap for $8 that's the same size as the green reservoir cap. I went ahead and got one of these and cut out the center of the cap to the diameter of the green cap. It's been on the car for two months now with no leaks and no signs of reacting with the pentosin. I'm going to look for a machine shop that can make an aluminum cap to the specifications of the green cap to replace the temporary brake cap and be done with this once and for all.
#6
10-30-2017, 09:39 AM
Resurrecting this thread!
My cap also just lifts right off the reservoir causing fluid to leak out. Anyone else have an issue or able to find another cap that you do not have to modify?!
My cap also just lifts right off the reservoir causing fluid to leak out. Anyone else have an issue or able to find another cap that you do not have to modify?!
#7
10-30-2017, 11:25 AM
Registered User
Join Date: Mar 2008
Location: Montreal Canada
Age: 69
Posts: 2,804
Rep Power: 266 
Just a suggestion, take a look at your power steering reservoir to see if the level is low. May be you got a faulty slave causing fluid migration towards the clutch reservoir and this excess of fluid push the cap off the reservoir.....
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#10
10-31-2017, 08:02 AM
I checked the PS pump level. All is in order. I really think this cap is just leaking because it will not even thread onto the bottle anymore.
Any options guys?
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