Clutch pedal effort - ZR-1 Net Registry Forums

LGAFF · 08-25-2009

How stiff is your clutch pedal, I just replaced the Cyl/Slave in the 90 and its got decent pedal pressure, not too fun in heavy traffic, while the 21K mile 92 has a new clutch but original Hyd system is pretty easy to push in.......wondering what you are experiencing. I am going to bleed the 92, but wondering if I should replace the slave? Any possibility the T/O bearing failure could be related to the hyd system?

vettn71 · 08-25-2009

Just changed the master and slave on my clutch last weekend. Moderate pedal effort, not hard at all. If the pushrods don't line up correctly, I understand that can increase pedal effort. Good luck

Jim

tomtom72 · 08-25-2009

Okay, my replacement set up has about 25k on it and it was always a fairly high effort. Actually the effort seems to be fairly constant from the OEM stuff right thru my replacement stuff.

Yes, for sure not much fun if I get caught in B to B in metro/NYC type stuff. I read somewhere that the effort is 80 lbs on the pedal....just can't remember where I read that. I remember thinking, that's a fairly high effort with a hyd assist! My 72 LT-1 had an 80 lb effort with a staright mechanical linkage for the clutch. I can't imagine what our cars would feel like if we had no hyd assist!

Tom

Locobob · 08-28-2009

Same thing happened to me when I replaced the clutch master and slave, pedal effort went up quite a bit. Hmmm....

bldavis11 · 08-31-2009

Quote:

Originally Posted by Locobob

Same thing happened to me when I replaced the clutch master and slave, pedal effort went up quite a bit. Hmmm....

Mine too! I've got about 50 miles on the new master and slave with significantly more pressure required than when I purchased the car 12K miles ago.

tomtom72 · 09-01-2009

Okay, so what conclusion can we draw from this informal research survey?

When I r&r'ed my stuff I did it because the M/C rear seal leaked at about 12k miles. I know that my car sat more than wnet anywhere. In 14 yrs the O.O. put 7400 miles on her. I put 5 k on it the first yr I had it. Before it leaked my pedal effort was high, and now with new stuff it's still high. Do we conclude that the wear over long usage makes for less pedal effort due to a by-passing effect from wearing out the seals?

Tom

08-25-2009	#1
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Clutch pedal effort How stiff is your clutch pedal, I just replaced the Cyl/Slave in the 90 and its got decent pedal pressure, not too fun in heavy traffic, while the 21K mile 92 has a new clutch but original Hyd system is pretty easy to push in.......wondering what you are experiencing. I am going to bleed the 92, but wondering if I should replace the slave? Any possibility the T/O bearing failure could be related to the hyd system? __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

08-25-2009	#2
vettn71 Join Date: Oct 2008 Location: Colleyville, TX Posts: 272	Re: Clutch pedal effort Just changed the master and slave on my clutch last weekend. Moderate pedal effort, not hard at all. If the pushrods don't line up correctly, I understand that can increase pedal effort. Good luck Jim

08-25-2009	#3
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: Clutch pedal effort Okay, my replacement set up has about 25k on it and it was always a fairly high effort. Actually the effort seems to be fairly constant from the OEM stuff right thru my replacement stuff. Yes, for sure not much fun if I get caught in B to B in metro/NYC type stuff. I read somewhere that the effort is 80 lbs on the pedal....just can't remember where I read that. I remember thinking, that's a fairly high effort with a hyd assist! My 72 LT-1 had an 80 lb effort with a staright mechanical linkage for the clutch. I can't imagine what our cars would feel like if we had no hyd assist! Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

08-28-2009	#4
Locobob Join Date: Jan 2004 Location: Portland, OR Posts: 1,057	Re: Clutch pedal effort Same thing happened to me when I replaced the clutch master and slave, pedal effort went up quite a bit. Hmmm.... __________________ Robert ZR-1 Net Registry Oregon State Director 91 ZR-1 #431 Black/Black LPE 368

09-01-2009	#6
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: Clutch pedal effort Okay, so what conclusion can we draw from this informal research survey? When I r&r'ed my stuff I did it because the M/C rear seal leaked at about 12k miles. I know that my car sat more than wnet anywhere. In 14 yrs the O.O. put 7400 miles on her. I put 5 k on it the first yr I had it. Before it leaked my pedal effort was high, and now with new stuff it's still high. Do we conclude that the wear over long usage makes for less pedal effort due to a by-passing effect from wearing out the seals? Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

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