Hello,

so I replaced all my lines and upgraded them to stainless steel with OEM it worked perfectly fine. I removed all lines from proportioning valve and master cylinder. When bleeding the Rear wheels both have barely any fluid that comes out and after many cycles moving to the fronts the stream out. I am able to get a stiff brake pedal when car is off but as soon as booster supplies vacuum pedal becomes spongey. Is this due to air in lines or prop valve needing to be “reset”…etc

Very Respectfully CreativeCris.

So, a question. When you bled the rears (and you're supposed to start with the furthest from the master cylinder -- rear passenger in your case, which it kinda sounds like you did) did you bleed to the point where you had zero air coming out the line and literally nothing but fluid? It kinda sounds like you had virtually zero fluid coming out and mostly air. If this is true, then you have air in the line, possibly a metric crap-ton. That would explain the spongy brakes.

Need to bleed properly