I've been battling a stiff clutch pedal ever since I did my T56 swap. So stiff I broke the clutch pedal twice. My Centerforce DF and mechanical clutch was lighter than what I have now.
Hydraulic clutch 13/16 MC.
Tilton Release bearing
McLeod RXT 1200 twin disc clutch
I pretty much ruled out alignment last year. Today I hooked up a pressure gauge.
- at the bleeder valve (end of the line after release bearing) I get 500+ psi, which drops a tad at the end
- Off the -3AN line that comes straight off the MC I get 1000-1200 psi and I didn't even hit my pedal stop.
I noticed that at the bleeder, it drained fluid quickly when i put on my pressure gauge. However when I disconnected the feed line, virtually no fluid at all came out. Does this tell me something?
Anyone have ideas from above results? Blockage, bad MC, etc?
Are you sure your line isn't too small at -3?
I wouldn't say it is a bad MC as you show that you have 1000-1200psi, which then drops to 500 at the end of the line(if I understand correctly).
It seems like there is blockage or restriction in the system somewhere that isn't allowing fluid to flow--thus the hard pedal. If it were air, it would make it spongy.
I have researched this a bunch and it is very similar to a braking system. Your master cylinder being that large also means it will be more difficult to press, but not so much that it should break your pedal.
Do you know your current pedal ratio? That would have an affect on it as well, but I would think there is something else in the system causing the blockage somewhere being that your master has that much pressure.
I know I read about this on LS1 Tech and it turned out to be a blocked line. Guy had a clutch issue.
I know on my camaro I will need to raise the point where the master attaches to the pedal point about 1 inch, or 2 inches from the pivot point on the. Yours might be a combination of a large bore with a pedal ratio that needs adjusted for the system.