Sierra JK

So a few blocks from home this morning I went to grab second gear coming out of a stop sign and the clutch pedal felt like it jammed. I pressed a little harder and it hit the floor and no longer has any pressure. I was able to put it into four low and then get it into first gear without using the clutch and limped it home.

After some web searching I was thinking that it's the slave cylinder. But it also now starts without having the clutch engaged which doesn't seem right and because it jammed up before going limp, I thought it might be the sensor/switch/whatever between the pedal and the master cylinder?

Any ideas on what I should be looking for to help diagnose the problem?

Sierra JK

Update: It will start without the clutch engaged in neutral, but not in gear.

LC Boyer

Sounds like you broke linkage

Mark Doiron

It is unclear if you were in 4WD-Low for the second part of that. But, are you aware that in 4WD-Low it is normal to be able to start the Jeep without pressing in the clutch? Helps when you need to start on hills.

tjkamp

Generally, but not always, if the slave cylinder failed there will be brake fluid all over the underside of the transmission, leaking either from the slave itself or out of the inspection hole under the trans or both.

Sixty4x4

Sounds like master cylinder to me. But one should replace both slave and master at the same time. Better hope it is not the clutch as the gearbox is a major job to re and re.

karls10jk

Transmission isn't that bad to drop and replace pieces, after you've done it a couple times. It's a little tedious but if you've got the correct tools and know how then you can knock it out in a day. I'm down to 8hrs start to finish. There's a decent video on YouTube where the guy slows down and shows the bolts as well as diagrams to maximize your visibility on it when you can't see any of it.

2climbbig

So, it's not uncommon for a slave cylinder to go out without leaking.

I fixed on slave cylinder where the rod actually bent and then snapped and the driver had they same symptoms as you.

Other thing is a broken clutch plate... that will also create the same symptoms.