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The clutch master cylinder can go bad without leaking. It is possible for the fluid to bypass inside the cylinder.
Typically this results in the pedal feeling soft, not hard as you have described.
The clutch pedal rod should not necessarily be adjusted all the way out, has this been adjusted to try to correct this problem?
I would suggest to check the clutch pedal adjustment as per the FSM
If the clutch hydraulics were working correctly it would be unusual for air to have gotten into the system. But not impossible. It would be a good idea to try bleeding the hydraulics, but that is typically only necessary when you have worked on the system.
Problems with the clutch disc, pilot bearing and pressure plate can all results in engagement issues as well. And a problem with the pressure plate can also result in increased effort to depress the clutch pedal.
An experienced technician should be able to give you a good idea how it's working by how it feels, That said, I've worked on cars for over thirty years and only ever worked with a handful of truly capable technicians
Some of the less capable technicians always want to replace all the components because that makes it less likely that they misdiagnose the problem. That said, if all the components are very old and the fluid hasn't been changed with any frequency, it is not bad consideration to change both the cylinders to prevent creating a problem.
I hope this info is helpful
Don't talk about it, Just do it!
Last edited by Vicoor; 06-27-2013 at 06:31 AM.