The disc brakes on a 47-55 using the standard kit, the calipers are about 3.5 inches lower than the lowest point on the master cylinder and about 1.5 inches lower than the prop valve when installed just below the MC. So, do I need still need residuals? I still wonder if there is any worry about backfill since the fluid would have to get thru the prop valve first. Maybe I am overthinking it. Wouldn't be the first time.