I just bought a 94 cadillac sts and had to replace ALOT of the brake lines and master cylindar. This has been done. I have bled and bled. I keep getting lines bled in patterns. Either the front or the back or fland rr or fr and rl. I have switched out the proportioning blocks twice. and now it is hooked directly( no blocks) and still there are problems. Now the car says. Brake Fluid-Switch- and traction disabled on the message board. The brake and ABS lights are now on. Ready to pull my hair out. I don't understand why the proportioning blocks keep not working and why i can't get all four lines to bleed . Any help would be greatly apprciated.

ive had some problems with the bleeding brakes with the 4wl abs from the 90'*. ive never worked on a caddy but my yukon wouldnt bleed the abs module until i cycled on the key