usually after a long period of driving (maybe 30min or so) my clutch pedal will eventually no longer return back up all the way, today however it did this and i had to force it into gear.
I drove it home and 5 min from my house it was beginning to slide into gears easier than what it was 20 min ago..

any ideas ? thanks much.

 

Could be a number of things, start by unbolting the operating cylinder from the transmission and work it a bunch to see if it feels ok, if it binds up a lot or if the.piston doesn't fully extend then either the master or operating cylinder **** the bed, replace both at the same time and a full fluid flush. If they appear to be functioning normally then the throw out bearing, clutch fork, pilot bushing, or pressure plate **** the bed and you need to drop the transmission for more investigation.

 

Might have also bulged the flex.line to the operating cylinder, might be air in the.line. Start by bleeding the clutch and visually check operation from below while someone else pushes the clutch a bunch.

 

There's 1/2 dozen possibilities and the issues you're having will only get worse with time! It may be a waste of time but check your clutch fluid level and color. My experience with Nissan MT's and their clutches is when the pedal fails to come all the way back the cylinder plunger is failing, allowing fluid to pass so you're not getting all the pressure needed for the pedal to return. Eventually your pedal will fall to the floor and you'll have to pull it back by hand, PIA while driving! Worn throw out bearings will make it difficult to engage, but have zero to do with your pedal issue!
Gary

 

I'm thinking of replacing the master cylinder , any good brands you guys would suggest ?

thanks for all the info , will loom into those solution on my next day off

 

Don't go throwing money at random parts until you figure out the real issue. If it's not the MC you've just wasted money you didn't need to. If you need to take it to a shop for a diagnostic, do so. It'll save you money in the long run. If you feel it necessary too take it to a dealer for some reason, go to Nissan not Infiniti. It'll be cheaper especially if you need to have something fixed.

 

I hate to be that old timey member that says to use the search button, but this is an old common problem.

Step 1, flush the clutch fluid. The clutch line runs near the exhaust and breaks down the fluid over time. Brake fluid absorbs water, so after a while it gets squishy. Flushing the fluid helps 90% of the time.

If you still have this issue after flushing the fluid, then go ahead and replace both the master and slave cylinders. I went with Centric brand, came in under $100 from rock auto.