How do you know whitch one is bad, Master Cylinder or Slave Cylinder? - JeepForum.com

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post #1 of 20 Old 07-31-2008, 10:13 AM Thread Starter
Morgan_TJ
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How do you know whitch one is bad, Master Cylinder or Slave Cylinder?

97 TJ, my clutch will not disengage when you push it to the floor. the pedal still has some resistance when you push it down but you can feel it still trying to pull. Does this sound like I am on the right track with the master or slave cylinder or could this be something else? I don't see any leaks around the master or the slave and i don't seem to be losing any fluid from the master reservoir.

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post #2 of 20 Old 07-31-2008, 10:31 AM
ArrizX
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Well dont quote me on this but the clutch works off the brake master right? So, if your brakes still work with out pumping them up then my process of elimination the slave cylinder has to be it.

That or something else, but i'm not sure what it could be. Very possibly a bad throw out bearing inside the tranny. Kinda an important little bugger.
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post #3 of 20 Old 07-31-2008, 11:13 AM
kloppk
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Quote:
Originally Posted by ArrizX View Post
Well dont quote me on this but the clutch works off the brake master right? ...
Negative.
They are completely seperate systems.

The problem is likely a bad clutch master cylinder or possibly a bad throwout bearing.
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post #4 of 20 Old 07-31-2008, 11:21 AM
Bill_Dunnigan
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brakes have nothing to do with the clutch

2005 LJ Rubicon - 6 Speed - Modded
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post #5 of 20 Old 07-31-2008, 11:36 AM
Bill_Dunnigan
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i replaced my slave cylinder with a bimba pnuematic cylinder and 5.1 DOT brake fluid, this fixed my issues just fine and cheap too

2005 LJ Rubicon - 6 Speed - Modded
2004 TJ X - 5 Speed - Modded - Long Gone & Missed!
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post #6 of 20 Old 07-31-2008, 11:37 AM
ArrizX
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Quote:
Originally Posted by kloppk View Post
Negative.
They are completely seperate systems.

The problem is likely a bad clutch master cylinder or possibly a bad throwout bearing.
oh, sorry.
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post #7 of 20 Old 07-31-2008, 12:26 PM Thread Starter
Morgan_TJ
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Is there a way to tell which one is bad or is it going to be a trial and error process to see which one is bad?
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post #8 of 20 Old 07-31-2008, 12:44 PM
Jim Miller
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On my '91 YJ I had the same problem. The shop had to replace the Master and Slave cylinders because a seal was breaking apart in the Master and small pieces were lodged in the Slave and in the lines. If it turns out that you find any trash in either cylinder (tiny pieces of rubber seal) - be sure to flush-out the line between the two cylinders as well. Or - you will get to do this all over again in about a week.
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post #9 of 20 Old 07-31-2008, 12:56 PM Thread Starter
Morgan_TJ
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Thanks, I was hoping i could get away with only replacing one or the other and not both.
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post #10 of 20 Old 07-31-2008, 01:46 PM
VICTIM_OF_PAIN
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In my 2001 the master and slave were one unit, it was called the hydraulic assembly. Not sure if that helps.



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post #11 of 20 Old 07-31-2008, 01:52 PM
UltimatE
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Have you tried bleeding the system?

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post #12 of 20 Old 07-31-2008, 02:01 PM Thread Starter
Morgan_TJ
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No, I haven't. do you think that could be the problem? If so the there has to be a reason that air is getting into the system i guess.
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post #13 of 20 Old 07-31-2008, 02:17 PM
IslandTJ
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Hopefully it's as easy as replacing the slave. If the slave isn't defective, the issue may be a failure in your clutch fork/throwout bearing.

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post #14 of 20 Old 07-31-2008, 10:46 PM
bigchevyman24
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I had the exact same problem...push the clutch to the floor and it will not let loose of the gear/engine. Does the clutch not want to come back up? I would push the clutch all the way down and not be able to get into a gear or out of a gear. Replace the slave and be done with it. Pretty simple process. If it was the throwout bearing, most likely the clutch wouldn't move at all. About a $50 fix...

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post #15 of 20 Old 08-01-2008, 08:23 AM Thread Starter
Morgan_TJ
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I think i will start there. Hopefully that will be all there is to it. What was the best way to bleed the system when i get the slave installed?
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