daveman what rear brakes are you running in the sedan ?? and how close is it to seeing the road ?? i'm looking forward to hearing about it

when i had the brakelines done for my front brakes i asked the guy doing the work his thoughts and experiences ..... based on the front discs holding 2psi in the lines there should be very little drag on the rotor, to test he suggested have the front wheel off the ground apply the brake and release, spin the wheel by hand to feel the drag. then quickly crack the bleed nipple to release pressure in the caliper re spin the wheel by hand and feel the drag, if it's noticibly less then the pressure valve thing is holding too much pressure in the line. the wheel should spin relatively free from drag when the brake is released. unfortunately he didn't really have any suggestion in regards to rectifying it
as for the rear he suggested to replace the drum brake valve with a disc brake valve in the master cylinder, if this wasn't possible due to the size of the valve then run with out it but look at installing a bias valve to get the required brake pressure to the rear brakes .....