Hey guys last time i posted i had just replaced fron calipers and flexible brake lines because the old set were hung up.
The new calipers were hung up worse so i returned them and same thing. (i dont think 4calipers could all be manufacturer issue)

I had suspicions of the proportioning valve but i cant find one at any auto parts stores and was thinking most likley the master cylinder return valve might just be stuck.

So i went ahead and replaced the master cylinder today (only 40 bucks) and flushed all the old fluid out. same issue, stuck calipers

my question is do i just need to replace all hard brake lines ? or do i need to just hunt for the proportioning valve? or bolth?

any info appreciated thanks