I have a 2004 Z06 with about 19,000 miles.
I've owned it since 4,000 miles and usually do Ranger's clutch fluid change a couple of times a year.

About a month ago, I took it to the dragstrip for the first time and did rangers method right before I went. I believe I made 6 passes on a 1/8th mile strip.

I never got around to changing the fluid after taking it to the strip. I've driven the car regularly since then without issue, both around town and a couple of road trips, probably put about 700-800 miles on the car since the strip.

A week ago, I got in the car and made a quick trip to grab lunch and thought the clutch felt a little strange at first, almost like there was a dead zone at the top of the travel that wasn't there before, but it quickly stopped doing it and I chalked it up to being a fluke.

So this weekend I go up to Richmond to visit my brother and the car gets there fine. Sunday morning I come down to my car, and get in to go home. It's doing the clutch thing again with the dead zone at the top of the travel. About a mile down the road, I put the clutch in as I'm coming up to a stoplight and the clutch goes to the floor and stays there. I manage to get the shifter into neutral, but I'm locked out of all the gears. Finally after messing with it for a few minutes, i get back into first, but the clutch is still to the floor and when I let off the brake, the car moves forward like the clutch is out...even though the car didn't stall when i had the brake on.

So I pull off the road and into the nearest parking lot getting ready to call AAA. While I'm waiting I shut it down and take a look at the clutch fluid, and its pretty black. I then got back into the car and started it up again and the clutch was working normally...

I drove it back from Richmond to Charlottesville without incident and figured maybe I just need to do a clutch fluid change. So I did Rangers method this morning and afterwards get in the car for a spin, and its doing the same thing. After letting it warm up in my garage, the clutch starts acting normally again.

Anyone have any ideas? Thanks.

 

It's either the master cylinder or the slave cylinder. You can change the master without pulling the torque tube, but you have to remove the tube to get to the slave. I just had a new clutch installed and it sure feels good.

 

...hopefully yours doesnt end up like mine did. Start with the easiest. The clutch master cyliner.Also ck for leaks along the ground. If that dont get it, your goin in the bellhousing for the slave. Mine did what yours did, except my clutch NEVER released. After changing the clutch master cylinder, i left it with my mechanic and it ended up being the PP. I replaced everything. I now have a monster stage 3