ZF6 clutch pedal problem - Chevy and GMC Duramax Diesel Forum
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Old 07-09-2012, 08:51 PM   eBay Motors  #1 (permalink)
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ZF6 clutch pedal problem

I have a 04 with the LB7 and the ZF6 manual tranny, i also have a lift with 35's. I just got a +80 and +100 efi live tune for the truck today and everytime that i really lay into it, mash the gas and than go to shift, the pedal sticks closer to the floor. It does not stick all the way to the floor and it still functions correctly put the pedal feels harder to push and is really close to the floor. When this happens i reach down and pull the acuator rod back closer to the clutch pedal and it goes back to normal unless i really mash the gas and shift. The truck also has 120,000 and it is the stock clutch, and my flud level is good for the master cylender. it has never happened untill i got this tune.
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2004 Silverado 2500HD RCLB LB7 With ZF-6
EFI Live by Duramaxtuner, DSP5 Switch
Banks Ram-Air Intake, 5'' Straight Pipe
South Bend DD
Air Dog 165
PPE Boost Valve
Pro Fab Intake Horn
Glow Shift Boost + EGT Guages
Zone 6in Lift
315/75R16 Baha Claw TTCs
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Old 07-11-2012, 02:28 PM   eBay Motors  #2 (permalink)
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From my understanding, the stock clutch is doing good to be holding the stock power, but your throwing a 80hp and 100hp tune at it. I wanna bet that it has something to do with the clutch slipping and getting hot. Especially being that it only started doing it when you got the tunes and only happens when you get into it. Clutch assembly cools off and everything works fine again. Thats my guess. So your probably gonna need to upgrade from that stock clutch and dual-mass flywheel. Southbend Clutches are the most talked about. Valair is another brand.

Feel free to correct me if I'm wrong.

Sent while driving.....
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Old 07-11-2012, 03:34 PM   eBay Motors  #3 (permalink)
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mine does the same thing on stock tune. doesnt slip at all, but after a hard gear pull or 3 it likes to stay down. i was thinking maybe flush the fluid and replace, rebleed and see what happens. my camaro did the same thing and it was a common problem. had to drill out the openings in the stainless hose going from the MC to the SC.
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2001 Regular Cab 2WD ZF-6
Tbar crank
265's
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Edge CTS
ADII
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Old 07-11-2012, 03:47 PM   eBay Motors  #4 (permalink)
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I am in the process of saving up for a clutch because both tunes slip it now so it could be like you said about heating up. I am gonna take it easy on her till i get a new clutch, a new pedal assembly and see where i am at. Thanks for the input guys

Sent from my C771 using AutoGuide.Com Free App
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2004 Silverado 2500HD RCLB LB7 With ZF-6
EFI Live by Duramaxtuner, DSP5 Switch
Banks Ram-Air Intake, 5'' Straight Pipe
South Bend DD
Air Dog 165
PPE Boost Valve
Pro Fab Intake Horn
Glow Shift Boost + EGT Guages
Zone 6in Lift
315/75R16 Baha Claw TTCs
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Old 07-11-2012, 05:51 PM   eBay Motors  #5 (permalink)
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I don't think you need a new pedal assembly but definitely replace the slave cylinder while you are in there. You won't regret doing a dual disc either!
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2002 2500HD ECSB ZF-6, SB DD, EFI with a DSP-2 switch, 4" exhaust, Airdog II 165, AFE intake, 3 inch drop shackles, home made traction bars.
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