I installed my stainless steel brake lines today and in the process, the master cylinder drained dry.
Once the lines were installed I filled the master cylinder and hooked up a mighty vac to each corner (order:LR,RR,RF,LF) and put vacuum on each caliper until I got fluid. After that, the pedal still went straight to the floor. I then re-bled the brakes by having someone push the pedal. After a couple rounds of bleeding each caliper this way, the car will stop and the pedal is firm but it takes half the travel to build pressure. When I push the pedal I feel a little play like normal, then slight pressure, and finally a very firm pedal which stops the car nicely. The period of slight pressure feels like air.
The pedal is significantly lower when it builds pressure than before I replaced the lines. So much so that it is difficult to heel-toe. After checking several times, I cannot find any leaks anywhere.
Any ideas?
I'm thinking there's air in the master cylinder but I'm unsure of the best way to get it out.
Thank you for your help!