That is a good question. I will find out today from the tech exactaly what happened and update the post.

This is Phil @ Vivid Racing!
 

I am sorry that the cylinder failed. I called you maybe last week. Unfortunately I have found out that as of the moment there is no aftermarket available (according to Stillen and JWT). BUT after I have informed Stillen and JWT they are doing some research into this. Both companies really can't believe that this has happened to a 370z. I will keep trying to look for a solution for you hopefully something will pop up. I have a lead from the great guys at Stillen telling me that the "jdm" cylinder they have heard might be better. I am trying to locate and get one for you. I hope everything works out and I will keep you updated to my findings.


Thanks,
Phil

IIRC a member from Australia had his master cylinder fail with the stock clutch... wonder if the clutch is really the culprit of the failure or if it was just a defective unit in your car, KB?

I don't think it's the clutch, but I've heard the slave cylinder is the weakest link. Nissan issued a recall with the '07 Z with some users reporting sudden loss of clutch pedal pressure causing it to sink to the floor. At least one owner got in a bad accident because of the pedal sinking to the floor.

Recall on slave cylinder - MY350Z.COM Forums

I'm surprised this issue exists with the 370Z. :shakes head:

I'm not surprised the stock CSC is a piece of junk and will not handle the pressures of a heavier pressure plate.

Read this: CuztomPartZ HR CSC Concentric Slave Cylinder Upgrade and INFO - MY350Z.COM Forums

I was warned about this a few weeks after I installed my new clutch. I've been talking to ZSP because they are engineering a full metal CSC replacement, not sure what the status on that is. Unfortunately, my clutch is a ticking time bomb right now. Fortunately, my Southbend clutch is a lot less stiff than the JWT so it should help lengthen the life of my CSC. Hopefully I get lucky and it doesnt happen for a good while, but I'm going to get AAA in the meantime.

The technitian that is responsible for my car is out today so I couldn't get an answer as to weather it was definitively the Clutch Master Cylinder or the Concentric Secondary Cylinder. I too would like to clear this up.

I will try to get my hands on the failed part/s in question so that I can take some pics and possibly get these item/s into the hands of JWT and or Stillen etc. so that some R&D can happen.

Anything is possible. I suppose it could be a faulty unit but my suspicion would be that the pressure plate is just to much for the stock cylinder and or the consentric unit.

To be clear, I never experienced any loss of pressure prior to the fluid dumping and my clutch pedal heading south never to return. Everything was in fine operating order until this happened.

I had the same problem 2 weeks back while driving the Alpenstrasse in Germany, driving along, go to change down and clutch pedal goes straight to the floor no pressure what so ever, the following morning clutch pressure was back checked fluid level all was ok.
Got the Z to the dealership after convincing them there was a problem it took them 3 days to get approval and parts from Nissan. They replaced the slave cylinder, CSC (in the old days would be the release bearing) and the steel hydraulic pipe to the CSC.
Had a look at the parts when collecting the Z and it was the CSC that had gone and this was with only 4550 miles on the clock

forgot to say stock clutch assy

Damn I want a clutch upgrade but this is making me a little hesitant.

Likewise. I will have to wait it out until there is a resolution.

CONCENTRIC SLAVE CYLINDER master-slave i know i'm a finicky a$$ about this stuff

Also lots of cars now a days use the concentric slave cylinder/combined throwout bearing setup, it isn't new it's just failed engineering thank the french they designed and made this part and the tranny. frickin resource sharing with renault.

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does anyone know if they have changed over the slave cylinder part numbers over the years? is the nismo slave stronger.

Just found this with a 30sec search on yahoo.

NISMO Slave Cylinder - Nissan SR/KA [ NIS-SLV ] - Enjuku Racing - Performance Parts and High Quality Fabrication

its for a 240 but maybe there the same

Good find. Diving deeper into this today when I get back from class...