Hey has anyone changed their proportioning valve . I need to do it on my work regal " The Intruder " I guess all lines will need to be bleed . Is this going to be a curse fest kind of job ? The Light is staying on and the rear wheel cyl blew out , i was in HVY Longisland Expwy traffic . I had the shop i rolled into do the rear cyl , but that was it , i didnt feel like paying up the , well you know . They said that the prop valve was bad to but how could i know for sure . The brakes work they just suck really bad .