Clutch diagnosis.

[MIG Wielder]

If you have a soggy clutch and there is no sign of leakage in either master or slave cylinder would this work as a diagnosis ?

Take an old Sprint clutch hose and cut off the master cylinder union end.
Solder the flanged end of the hydraulic pipe ( that would normally seal into the master cylinder ) to block it and also the cut end of the pipe.
The fill up the master cylinder with fluid into the union outlet and screw the modified pipe-end in.

If your now press the pedal, if the master cylinder is O.K. it should be rock solid; therefore the problem is the slave cylinder / pipe / linkage.
If the pedal is still soggy the problem is the master cylinder.

Would this work do you think ?
Thanks very much,
Tony.

[jikovron]

You can also use a 3/8 unf bleed nipple with care to not overtighten it but finding those quickly is faff as only ebay comes up trumps , I've done the same to bleed a master cylinder connected so that it recirced back to it's own fluid reservoir as it wouldn't bleed internal air out via the slave cylinder.
It does make the pedal immovable when the outlet is blocked and the cylinder is in decent condition and bled of air.

[Richard the old one]

I think I would put the hydraulic fluid in the master cylinder reservoir and not fully tighten the modified pipe up until hydraulic fluid was flowing out of the outlet, plus I think it would be a good idea to operate the master cylinder with the pipe connection not fully tightened up to ensure an air is forced out and then tighten it up.