I'm trying to fix my b210 and I have replaced the master brake cylinder, the calipers, the shoes,had the drums turned, and had the proportional valve and one other odd one thats right next to it that directs flow of liquid redone. I also bench bled the master cylinder and bled the whole system. It will brake if you push it to the floor but its really loose and doesn't brake to strongly. Sometimes though, if you pump it then it will firm up and brake well. NOT SURE PLEASE HELP! THANKS