Clutch pedal travels too low - Page 2 - ZR-1 Net Registry Forums

Paul Workman · 03-03-2022

Quote:

Originally Posted by Young1

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.

I'm not familair with the term "reverse bleed". What is that, zackly?

Paul Workman · 03-03-2022

I have bled the clutches on both the Zs by drawing fluid into the system via the slave cylinder -exercising and coordinating the bleeder valve and slave's pushrod to pull in fresh fluid and purge air out of the system. (It's VERY quick and IMO much more efficient than pumping the clutch pedal dozens of times (and I've done it both ways & would never return to the pedal pumping routine...unless I'm on my bicycle!))

DRM500RUBYZR-1 · 03-03-2022

Quote:

Originally Posted by -=Jeff=-

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

If 50 does not raise the pedal, do it more.
We gave up at 70 once, went back and did it again and finally got a pedal that worked.
If it is a new clutch, pressure plate, throw out bearing clutch slave and clutch master, then odds still favor an hydraulic issue.
Try 150.
I have to accept that a tech at a GM dealership installed the hardware correctly.
They don't let the lube tech do clutch installs.
Good luck and continue to keep us posted of your results.

Marty

-=Jeff=- · 03-03-2022

Quote:

Originally Posted by Paul Workman

I'm not familair with the term "reverse bleed". What is that, zackly?

Pushing fluid up through the slave.. i have a Phoenix Injector for that task

viper107 · 03-03-2022

revearse bleeding gets the trapped air out of the bends(thats where the air gets stuck and wont bleed out)

Paul Workman · 03-04-2022

Quote:

Originally Posted by -=Jeff=-

Pushing fluid up through the slave.. i have a Phoenix Injector for that task

Yeah, thanx! And, in conjunction w/ the '91-95 slave (bleeder on the bottom) I see how that tool would really be nice to purge the system.

Got pix?

lfalzarano · 03-04-2022

Thanks Everyone! IT IS FIXED!!!!!
The solution was that when the mechanic replaced the origins clutch master cylinder, he left the original shims on the firewall. He removed the shims, installed the replacement, and bleed the system. The width of the shims were limiting the clutch master cylinder piston stroke!

Pedal feel is perfect and the shifts are smooth.

Thanks everyone for your suggestions that narrowed down the possibilities!

Sent from my iPhone using ZR-1 Net Registry

03-03-2022	#12
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,493	Re: Clutch pedal travels too low I have bled the clutches on both the Zs by drawing fluid into the system via the slave cylinder -exercising and coordinating the bleeder valve and slave's pushrod to pull in fresh fluid and purge air out of the system. (It's VERY quick and IMO much more efficient than pumping the clutch pedal dozens of times (and I've done it both ways & would never return to the pedal pumping routine...unless I'm on my bicycle!)) __________________ Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry

03-03-2022	#15
viper107 Join Date: Dec 2019 Location: st louis mo Posts: 746	Re: Clutch pedal travels too low revearse bleeding gets the trapped air out of the bends(thats where the air gets stuck and wont bleed out) __________________ 95 admiral blue z(sold)/ / 93 ruby z(sold) 91 steel blue z/95 aqua z haibeck 510, 91 callaway 415 areobody #5

03-04-2022	#17
lfalzarano Join Date: Feb 2011 Location: Clayton, North Carolina Posts: 1,133	Re: Clutch pedal travels too low Thanks Everyone! IT IS FIXED!!!!! The solution was that when the mechanic replaced the origins clutch master cylinder, he left the original shims on the firewall. He removed the shims, installed the replacement, and bleed the system. The width of the shims were limiting the clutch master cylinder piston stroke! Pedal feel is perfect and the shifts are smooth. Thanks everyone for your suggestions that narrowed down the possibilities! Sent from my iPhone using ZR-1 Net Registry __________________ Lou[COLOR="Red"][B][SIZE="4"][/SIZE][/B][/COLOR]