Boilermaker

I had to replace the clutch master cylinder a couple years ago.I too ,had much trouble bleeding the air from the system but finally got it by removing the slave cyl. and moving the line from over the brake master cyl. so the clutch line would hang straight down and allow the air to rise up to the top. When put back in place it finally worked again like it was supposed to. No clutch trouble since. Why didn't Dodge run the line down all the way so there wouldn't be a higher than the cyl.place in the line to hold air?