Clutch Slave & Master Cylinder Replacement
05-07-2015, 01:02 PM
#31
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I can understand metal fatigue and how a spring can decay with use, but I have never seen one so bad that it impacts the feel of the pedal - but then again, it might be doing that and i just never thought that could be a problem area! 
Yes, its the spring assist in the pedal cluster that he is talking about.
Cheers,
Mike
Yes, its the spring assist in the pedal cluster that he is talking about.
Cheers,
Mike
ChuckJ
05-07-2015, 01:38 PM
#32
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Thread Starter
As Mike mentioned, yes.
But I also forgot to mention the pressure plate. Along with the preload tension spring in the pedal cluster, the spring tension of the pressure plate is part of the equation as well. It is what forces the slave cylinder piston back in, which via hydraulics then does its thing at the master cylinder up front to help the pedal return. Air in the system takes away from proper pedal action.
That is the way I understand it.
But I also forgot to mention the pressure plate. Along with the preload tension spring in the pedal cluster, the spring tension of the pressure plate is part of the equation as well. It is what forces the slave cylinder piston back in, which via hydraulics then does its thing at the master cylinder up front to help the pedal return. Air in the system takes away from proper pedal action.
That is the way I understand it.
08-15-2015, 03:19 PM
#33
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clutch bleeding issue
This is a great thread, good pictures.
I followed this but am struggling to bleed the system. Replaced the master cylinder, slave, and hydraulic line. Cannot seem to get the pedal pressure again.
Used motive pressure bleeder, 5psi, pumped by hand, nothing still.
Is there another trick to getting out the air?
I followed this but am struggling to bleed the system. Replaced the master cylinder, slave, and hydraulic line. Cannot seem to get the pedal pressure again.
Used motive pressure bleeder, 5psi, pumped by hand, nothing still.
Is there another trick to getting out the air?
08-15-2015, 04:16 PM
#34
Rennlist Member
One possibility is that you're allowing the fluid in the reservoir to get below the tube that feeds the clutch slave, potentially allowing air to enter the system. If you continue to have problems, connect tubing from the slave cylinder to a bleed nipple on the left rear caliper. Make sure the reservoir cap is off or at least loose. Open both nipples, then slowly and carefully push down on the brake pedal. Have someone close the nipples while the pedal is depressed before releasing. Repeat the procedure until the clutch pedal responds properly.
08-16-2015, 02:22 PM
#35
Three Wheelin'
This is a great thread, good pictures.
I followed this but am struggling to bleed the system. Replaced the master cylinder, slave, and hydraulic line. Cannot seem to get the pedal pressure again.
Used motive pressure bleeder, 5psi, pumped by hand, nothing still.
Is there another trick to getting out the air?
I followed this but am struggling to bleed the system. Replaced the master cylinder, slave, and hydraulic line. Cannot seem to get the pedal pressure again.
Used motive pressure bleeder, 5psi, pumped by hand, nothing still.
Is there another trick to getting out the air?
08-16-2015, 03:42 PM
#37
Yes! More pressure @ 10-15 lbs, but wouldn't go much higher for fear of cracking a 20 yr old brake res.
You are starting with a filled res, plus plenty of fluid in your power bleeder, yes?
You are starting with a filled res, plus plenty of fluid in your power bleeder, yes?
08-16-2015, 10:06 PM
#39
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All good advice.
Walked away yesterday, took my youngest to college today, came back, bled with more pressure 15-20psi, used the motive with fluid in it, back to normal.
thanks all.
Walked away yesterday, took my youngest to college today, came back, bled with more pressure 15-20psi, used the motive with fluid in it, back to normal.
thanks all.
08-17-2015, 11:02 PM
#41
Rennlist Member
For all those that have a "hanging" clutch pedal or what seems like a two stage pedal travel - let me suggest replacing the clutch kinematic arm - part no: 993.423.519.03. This one change on my car 10 years ago took the clutch pedal from a painful and frustrating experience to a joy - perfectly linear and smooth. Have never since had a problem with it.
Enjoy!
sean
Enjoy!
sean
