Quote:
Originally Posted by 2011 Nismo#91
I'm still a little dubious about the master cylinder being failure prone, there have been more documented failures of the heavy duty CSC then the master cylinder. If some shops are lying about replacing parts and sending cars back in non-working condition what makes you think they are even replacing the CSC instead of just topping off the fluid and sending the car back. I think there have been only 3 people here that actually know their MC went bad one of which had multiple failures which leads me to believe something else is causing it rather then getting multiple MCs in a row that are defective. I think it's more effective to say make sure the shop actually does the work they say they do rather then say all MCs are weak and need to be replaced.
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I can tell you from personal experience that the master is prone to failure. I've replaced the damn thing three times in 75K miles. Myself. It's not anything other than a shitty part.
If you didn't replace it when the slave failed, it will eventually crap out on you, possibly stranding you again
I've posted all over this forum on my experiences, but here is a-poor-attempt-to-be-brief synopsis:
( Click to show/hide )The car was my wife's DD for the first year and a half (20K miles or so), and my DD since. She drove it super easy almost all highway miles with no traffic. I drive it pretty hard, but it still gets a lot of easy highway miles. We got 25K miles out the first CMC; luckily the pedal went soft in my garage. I received an RJM clutch pedal assembly as a gift shortly after the first replacement, and I installed it hoping to relieve some of the stress on the clutch system (more geared at the CSC than the CMC).
The CMC went out again at 51K miles at my work; the pedal was soft but had enough pressure to limp home (dead giveaway that it was the CMC). I drive out to extremely rural areas of Texas occasionally, and the last thing I want is to get stranded with no cell service on a backroad with no traffic. I had already bought the Z1 aftermarket kit for the CSC, so when the second master failed I went ahead and dropped the transmission in my garage and dumped the OEM CSC (note that my CSC never failed on me). The install went smoothly over the course of a weekend, and I've had no issues in the 25K miles since. Oh except that the CMC failed for the third time right around 70K miles (20K on the unit this time).
I'm still on the stock clutch and fully expect to get 100K miles out of it. I am open to an explanation of how I could be doing something to cause wear on the master without wearing out the clutch faster also. I flush the clutch fluid with fresh Motul RBF600 every 6 months at least. The only thing I can think of is the clutch pedal is adjustable. But I'm pretty certain is it properly adjusted since I spent several hours on it myself. Also the fact that the consistency of the mileage between the first two failures despite two different clutch pedals and two different drivers.
Do yourself a favor and ensure the master is replaced
