Master/Slave Cylinder Problem -
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Unread 07-16-2013, 06:02 PM   #1
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1986 XJ Cherokee 
Join Date: Jul 2013
Location: Eugene, OR
Posts: 3
Master/Slave Cylinder Problem

Hey guys, I recently bought an 86 Cherokee that had been sitting a long time. Now I'm on the last problem and its really stumping me.

When I got the Jeep, the Clutch Pedal would not go down at all so I replaced the Master Cylinder with a re-manufactured one from RockAuto. I flushed the system out with dot 3, bled it and the clutch still would not disengage. Today I replaced the Slave Cylinder with one from AutoZone and bled it with a one man bleeder setup. Now there is no air but it also seems like the master cylinder isn't pumping fluid. It was pumping fine when I started today, filled up the one man bleeder bottle quickly 3 times and bled out a crazy amount of air, but now, nothing. Doesn't matter how much I pump, the fluid moves very slowly, if at all. And yes, the fluid is full.

1986 Jeep Cherokee Laredo 4x4
AX15 Transmission with external Slave
2.5L Engine

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Unread 07-18-2013, 02:01 AM   #2
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1986 XJ Cherokee 
Join Date: Jul 2013
Location: Eugene, OR
Posts: 3
I think I found the problem...

It appears that the reman master cylinder I got wasn't cleaned properly after being honed. Upon closer inspection, there are metal shavings in the brake fluid I put through it. The master cylinder started leaking today above the fuse panel as well and it wasn't yesterday.
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Unread 07-18-2013, 06:05 AM   #3
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1990 MJ Comanche 
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 9,950
Also, there was a problem in 1986 with the factory using improper fluid in the system. The fluid reacted with the internal lining of the flex hose, making an abrasive material which wore out the cylinders. It should be replaced also. And BTW, use only new cylinders
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