Rears never worked well? but you had a proportuning valve in line to rears to reduce the pressure???? don't make sense???In your picture on the table you got drum backing plate/shoes, discs with internal drum parking brake , Wildwood and oem type calipers------


did you have explorer drums or discs?? never mind I see you said you never had drums on rear---------


Disc brakes take more line pressure and are rarely decent feel with manual master cylinders and I also think that 1 1/8 inch bore would be pretty hard to push without a good size booster. Have you ever put gauges in to read pressures??