SOURCE: Bleeding clutch slave cylinder
if you loosten the slave bleeder screw and push in the clutch pedal fluid should come out if not make sure someone holds down the pedal and tighten the screw then pump the clutch a few times and hold the pedal and open the screw if no fluid repeat a couple of times if still no fluid you need either a new master cylinder or just rebuild it( normally cheaper) and if you rebuild it make sure you flush all the lines of debris
SOURCE: Bleeding clutch slave cylinder
i think youre doing the right thing. they are very stubborn to bleed because the hyd. line goes up high across back of engine before droppiing back down to slave cyl., trapping air. could try to gravity bleed by opening bleeder at slave, cap off of master cyl, full with fluid then it may start to come out after a bit. then try your process again. or can try to bleed at connections further up the line, working your way back to bleeder. hope this helps. be patient.
SOURCE: Bleeding Clutch Cylinder with no bleeder screw
I have not tried myself but see if the link below will work for your case. It is not the same model as you have but most vehicles have the same components for the non electronic parts. http://www.2carpros.com/forum/1988-dodge-dakota--bleding-air-out-of-clutch-master-cylinder-vt248517.html
SOURCE: 1993 chevy silverado 4x4 4.3 4sp. clutch issue
somthing is leaaking down then from what your desribing. probably the slave is it leaking fluid into the bellhousing?? these do trap air badly too because the bleeder is on the rear of the slave and it runs down hill with the drive train. jack the rear of truck as high as possible to get the air to rise to bleeder and bleed again
SOURCE: Bleeeding the clutch
This is what I would do.
Fill the master with brake fluid.
Make sure the slave cylinder bleeder is closed.
Have someone pump the clutch pedal fully down and while allowing it to come fully up about 20 times and then hold down.
Now with the clutch held down ........open the bleeder and hopefully some air will come out.
Repeat until fluid appears with out air.
The clutch master cylinder piston must be allowed to come fully back in it's cylinder to take in a new load of brake fluid with every pump and in normal operation.
Another way to bleed it......is to vacuum the fluid through the system from the master cylinder .......connecting to the slave cylinder bleeder valve.
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