State secret... time to share it with the group. I have a system that bleeds these clutch systems first time, every time. Works like this.
Go find a new [never had oil in it] old fashioned hand pump oil pump gun and about 3 ft of clear poly hose small enough to just fit over the bleed screw on the slave cylinder. [ I presume your master and slave are empty, the system having been drained when you removed either the slave or the master to replace them]
Remove the clutch master cylinder cap and set in on loosely [if you don't do this, you will squirt brake fluid all over the hood and engine compartment]. Fill the new oil pump can with clean brake fluid. push the clear poly line onto the spigot of the can, open the bleed screw and push the poly line over the end. Start pumping brake fluid from the bottom up to the master cylinder. Check the master cylinder frequently [or have a helper watch for fluid rising in the reservoir. When you have pumped enough fluid from the bottom to have it about 1/4 full, close the bleed screw, remove the poly hose, and fill the reservoir to full line [just pour some in].
Air wants to rise to the top, not be pushed down from the top, so that makes these systems VERY HARD to bleed. If you let nature work for you instead of against you by pushing fluid up from the bottom.. you are done in about 5 minutes.
I've used this system for more than 15 years, it's never failed.. first time, every time.
I'm now using it to bleed brakes, except I use a cheap electric fuel pump. Makes it a total one man job. Same principle.
