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03-02-2022
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#1 |
 Join Date: Feb 2011
Location: Clayton, North Carolina
Posts: 1,133
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Clutch pedal travels too low
I had a hydraulic clutch failure. So far the master and slave clutch cylinders have been replaced. The clutch, pressure plate and throw out bearing were also replaced.
A road test revealed depressing the clutch pedal barely allowed me to shift into gear. The clutch pedal started to engage about an inch from the firewall. What could be the source of the low level pedal engagement with the clutch? The re-bleeding of the clutch hydraulics provided no change in the clutch pedal engagement. Ideas? Sent from my iPhone using ZR-1 Net Registry
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Lou[COLOR="Red"][B][SIZE="4"][/SIZE][/B][/COLOR] |
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03-02-2022
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#2 |
 
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: Clutch pedal travels too low
what brand/type Master and Slave? are you sure they are good? (even though they are new)
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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03-02-2022
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#3 |
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Join Date: Feb 2011
Location: Clayton, North Carolina
Posts: 1,133
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Re: Clutch pedal travels too low
89-1996 clutch master cylinder from Corvette America. It doesn?t say the maker. They listed as their brand.
On the slave cylinder GM parts bought one that was exactly like the one they removed. No idea of the brand. I suspect either one is letting air into the system. I can?t be the thickness of the rug hindering engagement. The rugs have been around for many years. Sent from my iPhone using ZR-1 Net Registry
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Lou[COLOR="Red"][B][SIZE="4"][/SIZE][/B][/COLOR] |
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03-02-2022
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#4 |
 Join Date: Oct 2020
Location: Coweta, Georgia
Posts: 53
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Re: Clutch pedal travels too low
What clutch disk did you install? If it's not the hydraulics, it could be a matter of needing to shim the pressure plate if the clutch disk is too thick. Marc Haibeck has an article that talks about Centerforce clutch disks and the recommended amount to shim them.
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03-02-2022
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#5 | |
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Join Date: Feb 2011
Location: Clayton, North Carolina
Posts: 1,133
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Re: Clutch pedal travels too low
Quote:
Thanks for the tip. I have forwarded the article to the service manager at the Chevy dealership. The clutch kit and clutch slave cylinder was purchased by the the Chevy parts department. I?ve been feeding your suggestions to the service manager. He is in contact with GM support in trying to solve the pedal travel and hard shifting. I also asked Bill at ZFDoc for his thoughts. Sent from my iPhone using ZR-1 Net Registry
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Lou[COLOR="Red"][B][SIZE="4"][/SIZE][/B][/COLOR] |
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03-02-2022
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#6 |
Join Date: Sep 2016
Location: Ocala, FL
Posts: 900
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Re: Clutch pedal travels too low
I have the best luck to reverse bleed the clutch hydraulics to get all the air out of the slave. Ask them if they did that. Simple things first.
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Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much. |
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03-02-2022
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#7 |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: Clutch pedal travels too low
If you pump the clutch 50 times does the pedal get better?
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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03-03-2022
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#8 | |
 
Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,095
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Re: Clutch pedal travels too low
Quote:
 --Bob
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2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough" |
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03-03-2022
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#9 |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: Clutch pedal travels too low
My suggestion was based off of a slave cylinder issue from years ago. Bill B told me to try that. The system is self bleeding
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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03-03-2022
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#10 |
Join Date: Jan 2021
Location: Beautiful Bavaria
Posts: 523
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Re: Clutch pedal travels too low
So maybe BOTH will happen [emoji3]
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ZR-1 #638/1991 |
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