Clutch pedal pressure loss at high RPM's

[laynbdyon20s]

When i'm above 6500 RPM's, I feel like my clutch pedal is losing pressure and i have to press it down all the way. It does it in every gear. If I drive it "normal" pedal pressure is fine. Could it be that maybe my pressure plate is flexing?

I have an ACT 2600 clutch/pressure plate and a Findanza flywheel.

 

[joescool2008]

That's called boost, push your leg a little harder. =P I would guess maybe your slave cylinder is getting old and may need replaced.

 

[laynbdyon20s]

I replaced the slave, master, and the line. Dont think it's that. If it was a bad slave, I think I would lose pressure all the time, not when I'm high in the RPM's.

 

[Jdog]

How is your pivot ball/fork. What TOB are you using, how many miles are on it?? Also did you make sure your clutch is adjusted properly and your Pivot Ball is shimmed appropriately?

 

[laynbdyon20s]

How is your pivot ball/fork. What TOB are you using, how many miles are on it?? Also did you make sure your clutch is adjusted properly and your Pivot Ball is shimmed appropriately?

The throwout bearing is an OEM one, and it has about 8k miles on it. The clutch is adjusted, but I'll recheck again. My pivot ball is not shimmed. I had my tranny rebuilt about 15k miles ago (jack's transmissions, very very very happy!!!!), and I checked the clearances of how far the fork moves and was within specs according to jack's transmissions.

Any other possible ideas?

 

[stevo911]

Are you using the SS lines or the stock lines?

 

[laynbdyon20s]

Are you using the SS lines or the stock lines?

I'm using the SS lines.