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Old 07-28-2011, 10:24 AM   #1
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Replace Master Clutch Cylinder

Well...I believe my master cylinder went out in the 1992 YJ, 2.5, it was sticking and getting closer and closer to the floor, I ended up bleeding it a couple of times using the pump and hold method, which worked for a few weeks at a time, went to do it again last night and the pedal is dead, no pressure whatsoever and no air came out when bleeding this time either. So...I'm going to replace it now, was wondering, when I go to look for clutch kits on auto sites (yea might as well change everything out since the tranny has to be pulled) will they come with everything I need? I.e. master and slave cylinder, clutch plate, throwout bearing etc? I was looking at rockauto for exmaple and they didn't mention the master cylinder in the clutch kits they were selling. Any help/guidance would be much appreciated!

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Old 07-28-2011, 10:36 AM   #2
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Oh and if there's some sort of guide/how to/step-by-step for replacing all of this that would be awesome

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Old 07-28-2011, 12:15 PM   #3
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The master cylinder doesn't come in the kits. It must be purchased separately. I'd change it before replacing the clutch and see if that solves the problem. No need replacing the entire clutch if it only needs the master. It's a pretty quick and easy job, here's a link to a pretty good step by step.
http://www.myjeepwrangler.com/clutch.php
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Old 07-28-2011, 12:22 PM   #4
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Yeap I'm an idiot, I actually need to replace the slave cylinder, I believe that is the one causing all the problems. The site you sent makes sense, I don't believe the master is the problem, is there a sort of guide like the one you provided to change out the slave cylinder?

thanks for all the help
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Old 07-28-2011, 01:36 PM   #5
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I replaced my master three weeks ago. I filled it with fluid(all the orfices) using a syrenge(sp) before I installed it. I did not have to bleed the system. Works good.
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Old 07-29-2011, 08:25 AM   #6
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Change your master first trust me it takes 1/2 an hour and its cheap. If this does not cure the problem you’re correct you will need to drop the transmission and you yes you may as well do the whole deal you may even want to change your flywheel if it’s not perfect. Try getting a Haynes manual the only thing I don’t think you will have are torque specs for the clutch/pressure plate. Good luck dropping the transmission is no fun!
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Old 07-29-2011, 01:36 PM   #7
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Yea good call, I'll try the master cylinder first, the only annoying thing is I don't see any fluid leaking which to my knowledge indicates its not the master that's bad so, we'll see, here's to hoping I only have to spend a 1/2 hour working on it and not 12...
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Old 07-29-2011, 04:25 PM   #8
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Lucky you. My slave cylinder sprung a leak and is inside the bell housing. Had to drop the whole shebang. Kit included clutch, pilot bearing and hydraulic actuator (slave cyl). Not too expensive just lots of labor. Don't want to have to do this again. Good luck.
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Old 07-29-2011, 08:20 PM   #9
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Quote:
Originally Posted by steven18179 View Post
Yea good call, I'll try the master cylinder first, the only annoying thing is I don't see any fluid leaking which to my knowledge indicates its not the master that's bad so, we'll see, here's to hoping I only have to spend a 1/2 hour working on it and not 12...
I had to replace mine two weeks ago. Got stuck and had to get AAA to give us a ride home. Master failure typically has no pressure when you apply light pressure to the pedal. It goes right to the floor with no resistance. If you pump it quickly like 3-4 times it felt normal but you'll lose pressure pretty quickly. You won't have any leaks because it's the internal seal for the plunger that's bad. The fluid just leaks on by and it can't hold pressure.

Fortunately it's an easy swap. Took about an hour. I bench bled mine and because the line was full of fluid, I didn't introduce and air into the system. This way I didn't have to bleed the system.
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Old 07-29-2011, 09:14 PM   #10
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Look up clutch city online. Great prices on Luk kits.
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Old 08-02-2011, 12:28 PM   #11
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OK I've bought the replacement master clutch cylinder part, (50 bucks), and I'm installing tonight, what is the best way to bleed the system and get all the air out throughout all of the system? (I'm by myself unfortunately.) I'm just asking so I'll know if I need to buy anything additional prior to doing the job.
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Old 08-02-2011, 01:53 PM   #12
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Wish I could help you...the one I bought came with a self bleeding cap. There was a pin hole in the cap that let's the air bleed out as it needs to.
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Old 08-02-2011, 02:56 PM   #13
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Ok yea the one I just bought has a pinhole in the cap above, I assume just put er on and pump the clutch a bunch?
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Old 08-02-2011, 03:38 PM   #14
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Yes but keep a rag tight over the pinhole! The first few pumps, it will shoot the fluid out of that hole.
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Old 08-11-2011, 09:59 AM   #15
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08 wrangler clutch problems

stupid stupid question. i have an 08 jeep wrangler and i just replaced the slave cylinder. time to bleed the clutch. Where do i put the fluid in to bleed this thing?????
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Old 08-11-2011, 12:11 PM   #16
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