I have a bit of a nagging problem with my clutch pedal.

When I brake with anything more than moderately hard pressure, by clutch pedal falls halfway to the floor. It doesnt happen every single time I brake hard, but most of the time. And it is more likely to happen if I brake and turn and use rev-matching for gear changes.
The pedal will return to normal on the first pump but this is becoming a major annoyance now. There are no problems during normal daily driving.

The clutch was replaced on last friday with an Exedy standard replacement kit. NOT HD. Included a new pressure plate and thrust bearing. My spigot bearing was inspected and is fine.
And the clutch hydraulics were bled and fluids replaced just earlier this week. I did it myself using the reverse bleed method with a syringe. I am confident there is no air in the lines.
HOWEVER, this problem I am having was occuring before the clutch change and fluid bleed also.

Any thoughts from the pros as to the cause?

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RS Liberty - Because WRX's are only good for parts...

Stab in the dark - Clutch slave cylinder?

Darren

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When in doubt, Pull it out...

^^ What he said.

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[DBR]

Under normal operation. the clutch is fine. It disengages and re-engages normally and smoothly.

What I dont understand is how differing degrees of braking can affect the operation of the slave or master cylinders

Edit: There are also no leaks anywhere on the clutch hydraulics.

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RS Liberty - Because WRX's are only good for parts...

Have you got fat feet or wear Ronald McDonald sized shoes?

Firewall flexing? Something catching up near the hinges of the brake and clutch pedal?

I don't get it. When you push on the pedals the fluid is supposed to be compressed through the lines to engage the other end into action. Meaning if you push on your brake pedal and your clutch pedal travels, it must be trying to disengage the clutch. It doesn't make any sense at all.

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No more GC8, sad face.
[SIGPIC][/SIGPIC]

Both systems (I believe but google may be failing me here :P ) are vacuum assisted. I'm not sure if there is some kind of link between the two systems but perhaps some kind of proportioning valve is faxored and may cause a problem.

Once again, I preface this with the statement that this is a complete stab in the dark.

Darren

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When in doubt, Pull it out...

Clutch hydraulics are not vacuum assisted.


Just for kicks I have re-bled the clutch system last night and took extra effort to make doubly sure that there is ZERO air in the system.

Still the same problem.

Im all out of ideas

__________________
RS Liberty - Because WRX's are only good for parts...

I have just replaced the Master Cylinder with a known good one removed from a late model WRX.

Problem persists.

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RS Liberty - Because WRX's are only good for parts...

WTF???
The ABS system has nothing to do with the clutch...

Heh, the new ABS Clutch .. Mine actually feels like that in the morning!! Shudders like hell for the first few mins.

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[SIGPIC][/SIGPIC]
Should have bought an STI