I need help with brakes

[flouese]

Successfully replaced engine and master cylinder. I have a motive power bleeder and have bled the brakes at least 6 times with the bleeder and used the old fashion manual method. However, after bleeding the brakes, both methods, and getting no air out of the system, my pedal is still mushy and barely lows the car down. Additionally, if I keep the clutch depressed, it sticks to the floor.

My slave cylinder is less than 10K miles old.

The car sat for 4 months while working up the nerve to replace the engine.

While driving, the clutch works fine; able to shift smoothly through all gears.

Brakes work, but barely. I had to use the hand brake to assist in stopping.

I thought of replacing the slave cylinder, but didn't want to throw money in that direction if that is not the problem.

Any help will be greatly appreciated in resolving this problem