hey .. i was driving home yesterday and i was about to go in to 4th gear (it was very light driving) and when i pushed my clutch pedal it went right to the floor and stays there so i pull over and looked at the pedal i pulled it back and pushed it again it has no pressure at all so first i thought it has no fluid i check its full.
so i get it home jacked it up and look at the slave cylinder it has no leaks ... so i took off the clutch pedal it self and manually pushed the master cylinder rod in and out by hand and it had no pressure it was very easy to push i can here some sounds like oil gurgling but i had some one watch the reservoir to see if they see anything like air bubbles or the fluid moving and there was no movement
so i can not figure it out my nexted thing i want to try is bleeding it but i thought it ask here and see if any one else knows what it could be
a friend thinks its the master cylinder that died and think i should try to bench bleed the master cylinder.

so any help would be great

 

anyone know what it could be

 

My first thought was the master cylinder as well, happened to me once and I just swapped in a new one. Sorry I have no fix for ya, but I had the exact same problem it was the master cylinder.

 

I have the same problem.... My dad is a mechanic and he says that its the little pressure piston behind the clutch pedal (I forgot what its called), you can see it when you raise your hood and its right next to the break fluid. He said its because the seal inside the piston is probably worn out. So over time is looses pressure. I believe its only like $30 to buy another one. Ill let you know when I fix it if it worked out.

 

ok thanks thats what i think it is to

im guessing you talking about the master cylinder i hope thats all it is its going to suck to get it out

let me know how it works out for you

 

also check the piviot ball, where the clutch fork sits in, happen to me aswell ,

 

this happened to me as well in the middle of doing a burn out.

 

Ive been having this prob too. When I drive in the city (alot of stop and go) the clutch will start 2 fade till there is almost no pedal left but the clutch still engages. But when I go home and shut the car off its fine after about 15 mins. What's the deal? I was thinkin the master cylinder too, is there a final verdict on this?

 

I have the exact same problem. Before I proceed to remove and clean the master cylinder, can some confirm that the master cylinder is really the root of the problem?

 

While cleaning the master cylinder, it might be worthwhile to buy the piston kit and do a refresher.
For the VQ35DE MT - P/N 30611-5N325 $23.54

 

sorry for the late update but it ended up being the clutch fork pivot ball so i upgraded the ball to this one http://www.conceptzperformance.com/C...16.197.199.244 ........ and also changed the line to the braided stainless steel line and the master cylinder and slave cylinder too good thin i did both were full of crap and the slave cylinder had a broken spring so it all good now