Master Cylinder Bleeding
Not an Impala application but the same issue. I was having air bubbling out of the rear reservoir ( front brake circuit ) on a 90 Silverado with RWAL system.
I purchased a new master, bench bled it to the point where there was fluid motion and not arieation of fluid. I used the plugs that came with the kit and followed instructions. I bled this way for a good 30 mins. and installed this with the plugs installed.
When I installed the hard lines to bleed the system; the rear reservoir again had air again. What am I not seeing here? I've heard that masters are hard to bleed, so do I need to re-bleed the master with the "tube submerged in resevoir "style again?
Pedal is more firm but still feels like I'm compressing air. Any help?