Clutch master and Slave -
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Unread 03-27-2012, 10:43 AM   #1
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Join Date: Feb 2012
Posts: 4
Clutch master and Slave

Good day. 1988 YJ. I just bought this and the clutch didn't work very well. It was hard to put in gear. The pedal was very light. I drained the old fluid, which was black as night, pumped through new fluid and bled all the air out. I test drove it and it seemed to work good. I let it sit over night and test drove it again and had to pump the clutch 20-25 times before it worked. Test drove it for 1/2 hour and worked beautiful.

I cant tell if the slave is leaking cause it is inside the bell housing and need to pull the tranny. It doesn't seem to be leaking.

Could this be the master cyl seals are toast?
Can the slave cyl fail and not leak?
If there was still air in the system, would that cause me to have to pump the clutch up?
I thought I bled all the air out of the system, but should I try to bleed it more?

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Unread 03-27-2012, 03:04 PM   #2
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1997 TJ Wrangler 
Join Date: Apr 2010
Location: Joshua Tree
Posts: 58
Air in the clutch lines may be causing your problem. Try bleeding them again. If you do need to replace the master or slave cylinders do them both. A new master will exert more pressure on the old slave and cause it to fail. I know this from experience. Does your tranny have an inspection plate that you can remove and see if the bell housing is covered in brake fluid?
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Unread 03-27-2012, 03:21 PM   #3
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Join Date: Feb 2012
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No there is no inspection plate. It is leaking a small amount on oil at the rear engine seal so I can not tell if there is clutch fluid as well. If I pull the trans then I will be doing the rear engine seal, the slave and clutch come in 1 package for about $200 so I would do both of them and the front trans seal. I am going to test drive it again after work and see if it needs to be pumped up. If so then I guess I might as well just replace the master and the slave.
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clutch , cylinder , leak , master , slave

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