TwinTurbo.NET: Nissan 300ZX forum - sounds like air in the line
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Subject sounds like air in the line
     
Posted by DE944 on July 14, 2011 at 11:32 PM
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In Reply To Clutch slipping after warm up. It's a 91 clutch master? posted by sunroof446 on July 14, 2011 at 10:04 PM
     
Message The clutch lines on these cars split into 2 separate bleed points. One is on the slave cylinder and one is on the fender. The one on the fender has a tendency to trap air in it. When the lines get heated by the exhaust system, the air will expand and essentially push the slave cylinder and make the clutch slip. It is absolutely imperative that the system be bled from both bleed points.

I did mine many times and still had air causing clutch slippage on hot days. I could verify this with a fender bleed point test. When the clutch begins to slip, crack the fender bleed point (without touching the pedal). If fluid, or air squirts out then you have expansion. After doing this your clutch will return to normal until it cools overnight. Then the clutch will be very mushy or not work. I was able to solve this by bleeding both points ( work back and forth between them) with a vacuum bleeder (vacuum pump). That was 4 years ago, and I have not had a problem since.

There are some good write-ups on this problem all over this site. Check the FAQ section, and the search box. Read up on it before you go any further. Your clutch will thank you. Hope this helps.

     
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