When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
C6 Corvette ZR1 & Z06General info about GM’s Corvette Supercar, LS9 Corvette Technical Info, Performance Upgrades, Suspension Setup for Street or Track
Hi there all you clutch guys , just come back from our fathers day drag day on my last qualifying run i really launched hard went into second clutch pedal wouldnt come off floor , but by the time got to the other end i had clutch pedal again and clutch seems to be working ok, i never did another pass worried it mite blow something ,so i puttered off home tail down , any ideas clutch was brand new 12k ago so hasnt done alot of work , waiting with baited breath Thanks ps my car is 08 , vintage 20k on the clock. ZO6 .
It's the clutch master cylinder, unless you have had the original replaced. Same thing happened to me last year right in the middle of a half mile run, I had the master replaced, no more problem.
The new master came out around 2016 and is all black. The old one the fluid reservoir is kind of a cream white (black lid/top) the new one is all black. Go this route first.
It’s not the pedal it’s the clutch itself - the stock pressure plate does this at the end of its life and /or if it is being over powered. Time to go with a new clutch. Mine did the exact same thing until I installed a new clutch - in this case I went with the monster lt1-s.
It’s not the pedal it’s the clutch itself - the stock pressure plate does this at the end of its life and /or if it is being over powered. Time to go with a new clutch. Mine did the exact same thing until I installed a new clutch - in this case I went with the monster lt1-s.
You may be correct on the clutch being a contributing factor, however if the the original clutch master cylinder has not ever been replaced, I would look to its replacement first. The symptoms the OP reported are classic C6 clutch master cylinder failure symptoms.
0 for two. Keep going. I told you first hand my pedal was sticking to the floor. I could pull it back and it would work. Took it to the the dealer and replaced the master. Tech was standing there when they asked the symptoms. He asked if I could pull the pedal back and still work. Said yes and he said it’s the master. Even two years and works perfect.
I'm always looking to prevent such issues from coming up. I did the heads last winter to prevent the dreaded dropping a valve. Would I be ahead of the game getting a new GM master cylinder so this does not happen. 07 Z06 with 540 WHP 37K on the clock. Clutch seems fine and hooks up well.
I'm a bit surprised that no one has suggested checking the clutch fluid. My clutch stuck to the floor one time similar to this and it was because my clutch fluid was dirty, which is a fairly common problem. It wasn't my master cylinder. All I had to do was flush the clutch fluid and I never had the issue again (now at 160k miles ). OP - do a search on Ranger Method on how to replace the clutch fluid. It is a simple procedure and definitely worth trying first.
And for those that say replacing the master cylinder worked for them, maybe it was really the clutch fluid that was also replaced when the master cylinder was replaced that solved the issue.
Last edited by dmuellenberg; 10-05-2020 at 12:00 PM.
I am no expert, but have read many times on here that old, dirty fluid will cause a sticky clutch pedal as well.
Mine did the same thing and I repeatedly, drained, refilled and pumped the fluid until all that is in the reservoir was clean.
I believe that is referred to as the Ranger Method.
I'm a bit surprised that no one has suggested checking the clutch fluid. My clutch stuck to the floor one time similar to this and it was because my clutch fluid was dirty, which is a fairly common problem. It wasn't my master cylinder. All I had to do was flush the clutch fluid and I never had the issue again (now at 160k miles ). OP - do a search on Ranger Method on how to replace the clutch fluid. It is a simple procedure and definitely worth trying first.
And for those that say replacing the master cylinder worked for them, maybe it was really the clutch fluid that was also replaced when the master cylinder was replaced that solved the issue.
Yes exactly. When a master “fails” the piston seal falls off completely and never comes back to life. That is the revision they made to the new masters - that seal clip can’t fall off anymore.
Thanks everyone great feedback ill start changing fluid in the mean time and order a new master from america ,whos the best to buy that from ? west coast is the closest to us here in NZ . and who sells the monster clutchy it1-s that you mensioned many thanks again chaps brilliant
Can order the master from any GM dealership - just make sure it’s the black version.
Monster Clutch Company makes the LT1-s. amazing clutch! alleviated all high rpm release issues / clutch pedal sinking problems in all the cars I have installed into.
Here’s the part # for the updated master cylinder & yes it can begin to fail (pedal sticks to the floor) and then work for awhile after being manually pulled back up before the pedal sticks the floor again - happened in my Z06 before I replaced it.
10-03-2020, 10:38 PM
clutch issue
). OP - do a search on Ranger Method on how to replace the clutch fluid. It is a simple procedure and definitely worth trying first.
Master cylinder
