Various clutch pressure

[Bilko]

I have a problem with clutch pressure and after much researching there doesn't appear to be any forums posted that have the same problem as me. I drove home this past winter break from school and found my master cylinder was leaking. I promptly had it replaced (Slave cylinder replaced last winter). However on the way back, I noticed that pedal pressure kept increasing as I drove to the point where the clutch began to slip while driving. I researched and found the "Pedal pump up" forum and adjusted my clutch height and where it engaged (Current height of clutch pedal is just above the brake and has roughly 1.5 inches of free play before disengaging). This appeared to fix my problem for a few days.

However, now when I start my car from a cold start the clutch behaves as normal for ten to fifteen minutes and slowly builds pressure but not to where the free play is gone. Then, when I turn it off and let the car sit for a few minutes and start it warm the clutch becomes hard to push down and all free play is gone. I have checked the fluid level and it remains full.
I am out of ideas. The only conclusion I can come to is something broke right after I got the master cylinder replaced or they installed the master cylinder wrong but the garage shop refuses to be responsible for it, insisting there must be some kind of mechanical problem completely unrelated to anything they did.

My car is a completely stock 96 GSX with 86,000 miles except K&N intake. Any help would be much appreciated.

 

[cra]

did you correctly bleed the system? try doing it once again and carefully follow the the steps . the build up over time from a cold start is somewhat of a hint. although it may not make you feel better, this may potentially be an easier problem to deal with than the other way around when you gradually lose pressure.

if the above does not work, see below for other investigations. will need additional info though...
1) what clutch setup do you have and how recently was it installed?
2) are you using a SS braided clutch line, or are you still using the stock hose that has never been replaced?

 

[Bilko]

Thanks for the reply! If it isn't as simple as bleeding the system, what else do you think it could be? The only things ever replaced dealing with the clutch was the master cylinder about a month ago, and slave cylinder a year ago everything else is completely stock never replaced. I'm gonna have it bleed this weekend, just the sudden pressure increase in the clutch when the car has sat off for 4-5min and starting it warm and having it be harder to push down then before just seems weird.

 

[cra]

just curious to know what clutch are you using? how long ago was it installed?

the clutch setup is a manual hydaulic system. so there should be continuous fluid (no air bubbles). however in your case and until you get it fixed, so long as the pressure does not get unbearable, you should be fine. the SS clutch line mod is an easy thing to do before bleeding the system.

also before bleeding the clutch readjust the pedal height to allow more adjustability at a later time, especially if it is at a point where not much future adjustability is available. this way if the pressure problem comes up over time you can look to this option to partially address it.