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[Z06] Clutch Pedal Issues—How-To Prevent and Cure
03-26-2010, 01:17 AM
#163
Supporting Vendor
2005 C5Z - HPDE car - 20k miles
Motor was replaced this winter - no clutch issues prior. 5-6 HPDE's and more than a few launches. Previous owner did many as well.
After 4-500 miles break in I am doing high RPM shifts.
It took a few cycles but I get the sticking pedal - it stays roughly half way down - ONLY on high RPM shifts. After slowing down and pulling the pedal back out normal operation resumes.
I'm using Motul RBF600 because the clutch line goes awfully near the headers.
Will flush/clean and report back.
The clutch was clearly engaged when the pedal was stuck - I had to rev match to shift. So - the clutch master cylinder MUST be what is hanging up. There is no way some dust will stop the slave cyl/clutch from re-engaging when you release the pedal??
What action returns the pedal/plunger? - pressure from the returning fluid?
Motor was replaced this winter - no clutch issues prior. 5-6 HPDE's and more than a few launches. Previous owner did many as well.
After 4-500 miles break in I am doing high RPM shifts.
It took a few cycles but I get the sticking pedal - it stays roughly half way down - ONLY on high RPM shifts. After slowing down and pulling the pedal back out normal operation resumes.
I'm using Motul RBF600 because the clutch line goes awfully near the headers.
Will flush/clean and report back.
The clutch was clearly engaged when the pedal was stuck - I had to rev match to shift. So - the clutch master cylinder MUST be what is hanging up. There is no way some dust will stop the slave cyl/clutch from re-engaging when you release the pedal??
What action returns the pedal/plunger? - pressure from the returning fluid?
05-19-2010, 12:52 AM
#164
Le Mans Master
Ranger like many before me I'd like to say thanks for the info,insight,DIY, instructions. I see fluids in completely different way, a preventative maintenance way.
RPM 4l80E conversion!
05-26-2010, 04:19 PM
#168
This was very well done. I just replaced my clutch fluid following your procedures. It made a big difference in my clutch pedal feel.
Thanks for sharing with us your insight. This well help us learn and pass it on.
Thanks for sharing with us your insight. This well help us learn and pass it on.
06-03-2010, 03:11 PM
#171
Thanks Ranger. My 06 has a little over 12,000miles. I don't know why I've never paid any attention to the clutch fluid, but it looked like "INK".
I ran 3 bottles of Prestone Dot 4 through it per you instructions and finally it looks pretty good.
I ran 3 bottles of Prestone Dot 4 through it per you instructions and finally it looks pretty good.
06-07-2010, 04:44 AM
#172
Le Mans Master
Member Since: Jan 2009
Location: Pottsboro; Sometimes Dallas Texas
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St. Jude Donor '12
Thanks for the post Ranger....I just bought "Blue Babe", my '10 Z06 last week and have learned one of the tricks of caring for these beasts!! Thanks allot.....tim in North Texas
06-09-2010, 11:09 AM
#173
Thanks for the info. Mine took about 20 flushes and 2 bottles of DOT 4 Prestone fluid. I used a mini hand pump designed for oil bottles to suction out the old fluid.
My car must have really needed it since the clutch seems to engage/disengage more smoothly between shifts after having done it. (Apparently 3 years and 32,000 miles is at the far end of the stock fluid's effectiveness).
I did notice that it seems to get dirty again after a couple of run cycles though. I'm pretty I did it correctly because each time I put in fresh fluid and pumped up the system the reservoir would be dirty again.
My car must have really needed it since the clutch seems to engage/disengage more smoothly between shifts after having done it. (Apparently 3 years and 32,000 miles is at the far end of the stock fluid's effectiveness).
I did notice that it seems to get dirty again after a couple of run cycles though. I'm pretty I did it correctly because each time I put in fresh fluid and pumped up the system the reservoir would be dirty again.
06-11-2010, 09:10 PM
#176
Clutch Life
Thank you RANGER...I bought my 08 with 15,000 miles on it last fall. The Clutch fluid condition was hideous. It took 20 charges and a 6 pak of beer to clean it up. Also changed the brake fluid as it was also contaminated. Thanks again for the very informative info and video. 
06-13-2010, 02:53 PM
#178
06-14-2010, 12:07 PM
#179
Race Director
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Bud is correct. Here are the specifics from an earlier post in this thread:
Ranger
I use Prestone DOT4 and GM Super DOT4 interchangeably without issue.
In practical terms the fluids are equivalent. And if swapped frequently, I don't see any particular benefit to running the GM-brand (Part No. 88958860), which costs 5-times as much and isn't always available at dealers.
Prestone DOT4 12-ounces $2.65 at Walmart
GM Super DOT4 8-ounces $8.50 at dealers, when available
Ranger
In practical terms the fluids are equivalent. And if swapped frequently, I don't see any particular benefit to running the GM-brand (Part No. 88958860), which costs 5-times as much and isn't always available at dealers.
Prestone DOT4 12-ounces $2.65 at Walmart
GM Super DOT4 8-ounces $8.50 at dealers, when available
Ranger
06-27-2010, 06:09 PM
#180
Melting Slicks
I just did mine this afternoon. Just bought the car, has 22k miles on it. I went through 2 bottles of Prestone Dot 4. After 2 bottles, it was looking nearly as clear as it was coming out of the bottle, but I could see the smallest of white specks in the fluid still. I think I re-flushed it out 4 extra times to get rid of those miniscule spots before I conceded the fact that it will never look like it just came out of the bottle when it has to cycle through the line, slave, master, etc... The color was identical, but fresh out of the bottle it is 100% clear...then after 30 pumps, it is the same color, but has this tiny tiny little white/clear/air specks in the fluid. Is it possible to pump the system enough to make those disappear? Am I just too lazy, or am I expecting the impossible?