Zf6 Clutch Sticking to floor - Ford Powerstroke Diesel Forum

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post #1 of 22 Old 06-24-2013, 05:22 AM Thread Starter
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Zf6 Clutch Sticking to floor

Did some looking around found people with same issue but can not seem to find a fix.

I have an 06 6.0 ccsb zf6, when I romp on it or go high speeds (90-100)sometimes the clutch pedal sticks to the floor so far it has been still engaging the clutch like just the pedal is stuck ( I don’t notice it until the next shift)

This morning on the way to work I got on it pretty good on the highway speeds up to 105 and when exiting went to downshift and my pedal was hard as a rock, it stuck to the floor and clutch would not engage. I pulled the pedal up and pushed it back down 3 or 4 times before it started working normal again.

How can I fix this issue? Clutch is fine never slips will die in 1st gear if you don’t give it a little throttle. Only time I ever have issues is stomping on it and or high speeds 90-100.
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post #2 of 22 Old 06-24-2013, 02:53 PM Thread Starter
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okay did some testing on the way home. when shifting at higher RPM's clutch sticks to floor. when reaching speeds faster than 93 clutch gets rock hard.
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post #3 of 22 Old 06-25-2013, 12:07 PM Thread Starter
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Anyone else drive a manual?
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post #4 of 22 Old 06-25-2013, 12:18 PM
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Drive a manual, no help with the problem though. Here's a bump for ya.
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post #5 of 22 Old 06-25-2013, 12:51 PM
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I've got the same problems - however mine sometimes sticks to the floor around 50mph.... I rarely go 80+

I'm working on a resolution with my trusty mechanic, Michael (username sargar) - maybe he'll bump in here and give some suggestions.

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post #6 of 22 Old 06-25-2013, 01:03 PM
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Mine did it a few times but I replaced the clutch and hydraulics all at the same time hasn't done it since not much help for ya free bump. Does your clutch master cylinder fluid look cloudy maybe a seal in the master or slave?


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post #7 of 22 Old 06-26-2013, 08:02 PM Thread Starter
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Ok spent all night on some dirtymax sites as they also use the zf6 and apparently they made alot of manual trucks as there were alot of people with this same issue. Still unable to come up with a 100% diagnosis but seem more often than not it's caused by stock clutch slipping.

Which in my case makes sense (here's to that bitter sweet moment when you take your truck out for the first time after dumping lots of time money in it to haul a$$ only to find your clutch can't hold the power).

If fluid level is good and master and slave arnt visibly leaking it's your clutch. For those that are primarily getting the hard pedal this could be caused by fluid boiling try changing the fluid. heard to use dot 5 brake fluid. I'm going to change my fluid to see if it helps at all as I dumped every last dime in the engine and won't be able to aford a clutch for a bit.

Luckily it doesn't do it with stock tune but stock is ssssoooooo slooowwwww now
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post #8 of 22 Old 06-27-2013, 04:29 AM
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Very cool, thanks for the info! You also managed to put to rest a suspicion I had about the Duramax guys also using the ZF6. I read somewhere on another forum that one of them had the ZF6 tranny in it - and I thought, "Surely that's a different manufacturer or a transmission swap... or something" Glad to know that I wasn't losing my mind!

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post #9 of 22 Old 06-27-2013, 04:45 AM Thread Starter
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yeah I thought it was weird I didn't know they were the same until my snap-on dealer told me. ( he just swapped one into his Bronco)what's even more weird is the Corvette has a zf6.

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post #10 of 22 Old 06-28-2013, 05:09 AM
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The durmax zf6 is similar as far as gears go but mounting and design of slave cylinder is completely different it's all internal mounted on the input shaft it's self not like ours where it's all external mounted. They also use the same transfer case I believe


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