[Boxxerace]

I just replaced my stock clutch hose with a stainless aftermarket unit. I had the benefit of having my engine out at the same time, so it was easier to work on than what you had to work with.

In my case, I replaced the hose > filled up with fluid > attached bleeding hose to nipple (with a catch bottle) > loosened bleed nipple while manually compressing the piston > tightened the nipple and then released the piston. I cycled through until I had nothing but fresh fluid with no air-bubbles. I had to fill with fluid several times.

Note: You need to not overfill the system with fluid. As the clutch is depressed, the fluid level rises.

In your case, it sounds like you had either a big bubble that moved down or a leak. I had no issues in my case and I'm not exactly a pro at bleeding hydraulics. I take it that the clutch would not dis-engage?

 

[BlueCorn]

In a pinch, you can often gravity bleed a clutch system. Just top off the master, crack the bleeder on the slave and let it drip. Close it up, top off the master, check the pedal. Repeat a couple of times if necessary to get a good pedal feel.

It's not as efficient as other methods but sometimes you get stuck, with no helper.

 

[Subaroux08]

I’m having the issue of I had my clutch replaced a year ago and the other day the clutch just went to the floor& will not pump up. I replaced both master & slave cylinder, clutch pedal still will not pump up. When you push the clutch in you then have to manually pull it back up. Please anybody!!!!!

 

[Max Capacity]

I'm not sure but like a Brake MC do you have to bench bleed it before installing it ?

The instructions comes with the new MC ?

 

[Max Capacity]

This may help, See about 4:30 seconds, how to bench bleed the MC,

subaru clutch master cylinder replacement - Google Search