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Old 02-16-2009, 03:36 PM   #1
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Master cylinder problem?

The other day I'm driving my '92 Wrangler and all of the sudden it becomes almost impossible to get into gear. I can manage to get it on the highway and into 5th and idle most of the way home but now when its on it won't go into any gear. When its off I can get it into gear but not when its on.

I looked in my master cylinder and the fluid level was way low, so I topped it off and tried bleeding the line with the pump-bleed method. There was absolutely no clutch resistance whatsoever after bleeding it for ten minutes. The fluid just dribbles out and I've only ever bled brake lines, and the fluid there came shooting out. So I took the master cylinder off and pumped it manually and nothing is coming out. The Wrangler has about 130k so I'm thinking this might be something to break about now, but could this be a clutch issue too?

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Old 02-16-2009, 04:31 PM   #2
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Are you using the 2 person method or just pumping the pedal and getting out and cracking the bleeder open. You should use 2 people to do it same as brakes. It's possible that your clutch master cylinder is borked. Autozone has replacement ones. They have plastic and metal ones but they are the same part number so the Joe behind the counter won't know what your talking about if you ask for a metal one. If you can talk em into it have them check all of em and see if they have the metal one and get that. I've already been through this before. 4 trips later.

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Old 02-16-2009, 05:49 PM   #3
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We used the two person method to bleed the clutch. The master cylinder I have is a plastic one, is the metal one better?

If its not the master what else could it be?
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Old 02-16-2009, 05:52 PM   #4
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I've had nothing but bad luck with the plastic ones from Autozone. That's not to say your OEM is crap. If it's not the master cylinder then it could be the slave cylinder at the clutch fork.
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Old 02-17-2009, 12:01 PM   #5
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I've had nothing but bad luck with the plastic ones from Autozone. That's not to say your OEM is crap. If it's not the master cylinder then it could be the slave cylinder at the clutch fork.
I'm guessing that means dropping the whole transmission? But this doesn't sound like a clutch problem to you?
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Old 02-17-2009, 12:22 PM   #6
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No. The slave cylinder bolts to the outside of the bellhousing.
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Old 02-17-2009, 01:07 PM   #7
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No. The slave cylinder bolts to the outside of the bellhousing.
Not if he has the pre '95 ax15 then it is inside the tranny.
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Old 02-17-2009, 01:24 PM   #8
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Yeah I have heard 94-95 have exterior slave but all other years are interior.
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Old 02-17-2009, 01:45 PM   #9
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Doh!! Your right. I was remembering how my 94 was.
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Old 12-28-2011, 08:51 AM   #10
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HI
I have same clutch problem on my 89 YJ.
Can you please post how the problem was fixed.
thanks.
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Old 12-28-2011, 09:30 AM   #11
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If you pump the clutch and feel no resistance, and there is no fluid leaking out, you have master cylinder problems. Fluid is leaking past the piston in the master cylinder. The slave will expand out if there is fluid in the system when the clutch is pushed in if the master is good. You will feel that as resistance in the pedal. One way to tell the difference between resistance and no resistance is to have someone crack open the bleader valve and pump up and down a couple times. That should be what no resistance feels like. The reservoir should be full before doing this. Then close the bleader. Pump the clutch and see if there is more resistance. If there isn't then you either have a leak in the system, or air in the line, or the master is not working. If there are no signs of leaks I wouldn't suspect slave. If your slave is internal then dropping the transmission will be necessary to replace it.
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Old 12-28-2011, 11:17 AM   #12
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As long as we're on the topic of clutches, I'll throw in a question.
My 93' has been giving me some trouble shifting into 3rd lately. Sometimes it feels like there's a little resistance when I shift, almost like I'm forcing it. I had the master cylinder replaced last year. Does that mean the slave is starting to go?
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Old 12-28-2011, 12:03 PM   #13
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some master cylinders have a rubber cup/seal inside and you need to make sure you remove this in order to fill it.

if you have a master cylinder that is low then you have a leak, if its the master you can look on the inside of the fire wall and you should see a "stream" of wetness flowing down from where the master cylinder rod pokes through, if thats dry then grab the rubber boot and move it and see if any fluid leaks out if still dry then the slave cylinder is leaking if its an external then you can move that rubber boot and should see fluid, if its internal then it will be harder to see but if you fill the master cylinder up and pump the clutch you should see fluid leaking out the bottom of the bell housing at some point,sometimes you can look inside the bell housing and see a wetness on the clutch..

my process of bleeding a clutch is... fill master, pump for a min, hold,bleed,pump,hold,bleed,fill, repeat..
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Old 12-28-2011, 05:55 PM   #14
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mine done the same thing about a month ago.it wouldnt go into gear unless the engine was off. turns out my master cyl. was leaking fluid down the firewall behind the pedals.replaced it and fixed the problem.you are going to have to bleed it though.the fluid leaking down my firewall was eating the paint off.be carefull not to spill the brake fliud on your paint.took 10 min to change out
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Old 12-29-2011, 04:16 AM   #15
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thanks kdub - I have same problem with fluid inside.
I note that master cylinders can be had for around $20 up to $200 - anyone have any comments on the cheaper makes like Clutch master (CTEK or premium?), Sachs, Dorman or Rhinopak. Thanks
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Old 01-17-2012, 05:16 PM   #16
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have now replaced the master cylinder and bled the system.
did not work - still will not go into gear. Can start in first or reverse and clutch seems to work partially, but can not move into neutral or change gear.
what next?
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Old 01-17-2012, 07:00 PM   #17
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if you still have no clutch pressure with new master, the slave is probably toast
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Old 01-18-2012, 06:38 AM   #18
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^^^^x2^^^^ The slave is having issues, get that changed and see where that gets ya!

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