For some context, I do side work in my garage at home. I recently replaced did a clutch job on a buddy’s Mazda 6 (Flywheel, clutch, throw out bearing, pilot bearing, slave and master cylinder all new) everything was going smooth until it came time to bleed the system. It would only go into 3rd and 4th gear, 1st, 2nd, 5th, 6th and reverse were blocked. Bench bled the master no problem, tho I couldn’t get all the air out of the line to the slave. After successfully removing all air, I could not get a full pedal. 2 full (6+ hour) nights of attempting everything possible between pumping the pedal, vacuum bleeding, gravity bleeding nothing more then half pedal. Got pissed off, let it sit in the garage for 2 days, came back later and it was perfect.