TwinTurbo.NET: Nissan 300ZX forum - I have same problem.
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Subject I have same problem.
     
Posted by ZTurboFan on July 21, 2011 at 5:02 PM
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In Reply To Clutch pedal travel issues posted by Obeeone on July 20, 2011 at 01:10 PM
     
Message Different car. But here's what I can tell you, the car works great pretty much all the time. Except on HOT days. I did some research, and had some people suggest that I have air in the lines.

I removed the slave, made it the lowest part of the system, and then pushed it in as far as it would go about a dozen times. At the master cylinder, there was zero signs of air in the lines. Nothing came out except perhaps the odd super super tiny bubble.

Then I had a guy who I believe had the same problem suggest to me that it was the o-ring in the bottom of the master cylinder. I think he's right! Realistically, there's not much left, so I bought a new master cylinder and all that it entails and I will install it when I have some free time.

The only difference I can see between your problem, and the one this car has, is that possibly your master is just a little bit further along in fail mode! When I pump the pedal a few times, it responds and builds pressure and I can change gears.

Trying to get the air out (if there is any) at least doesn't cost you any money. So you might as well cross fingers and pray. But I think you'll find it is the master cylinder...

Congrats on the Baby!

     
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