Try rebleeding the hydraulic system here are a couple ways to do it.
Step 1/remove the slave from the box mount @45 degrees and fill it up. Next remove the master and slave from the vehicle, the slave will fit out through the fender well and I found that the master will follow out throuth the bottom. Set the slave in the vise aside for now. Remove the line from master, fill the new master as you did the slave 45. Dont put rod in the master as of yet, remove the line from slave and attach it to the new one lube with brake fluid new o ring now push in on the slave just enough to push out some fliud now attach the filled master to the line as well as the resivor. Mount the master in the vise @ 45 now with an assistant holding the resivor up push the slave in and out watching for air wok the master as well when you are @ o bleed the unit is ready to install I found it easier to install the master with out the rod you can put the clutch safety rod as well as the washer and cushin. This work perfect for me.
Or this way
Simply replace the MC, fill it with clean fluid and then cycle the pedal slowly, 15-20 times. Clean up your tools. Make sure the MC is still full of fluid and cycle the pedal again 15-20 times. Go to lunch or maybe do and oil change. Do the pedal thing again, make sure the MC is full and go for a test drive.
This system is essentially self bleeding, but it takes patience. Something we all seem to be in short supply of when playing beat the clock. Good luck.