Honda Repair: 91 accord brakes hydralics, caliper pistons, wheel cylinders

Question
Brakes have gotten very soft. Replaced rear wheel cylinders and pads.  Front discs are good.  Went to bleed system.  Got good pressure from driver rear and passenger front.  From both passenger rear and driver front I get about an inch of fluid into the tube and then it stops.  No amount of pumping the brakes builds enough pressure to bleed that part of the system.  Any suggestions?  

Answer
It is possible that the master cylinder has gone bad. The system is a split-diagonal system so the drivers front and passenger rear are pressurized by the same chamber in the master and the passenger front & drivers rear are on the other. So with what you are describing this is definitely a possibility! The most common problem I have seen on the 90 - 97 accords causing a soft pedal is one or more of the front caliper slides being seized. remove the bolts that hold the caliper and they should come out very easily after being broken loose. If one or more are tight or hard coming out you have found your soft brake pedal problem. Don't loosen the bolts that hold the caliper bracket to the knuckle, this will not show you anything. make sure both caliper pistons push in with slight pressure, you may have a seized caliper as well. As far as the bleeding problem, it could be the master but with the age of the vehicle I would say take the bleeder all the way out and make sure both holes are not restricted or closed with rust. If they are use a pic and compressed air to unclog them. I have worked on many an accord with blocked bleeder screws causing a similar situation to what you are describing. If the wheel cylinder in the rear is new and it still won't bleed than I have to point to the master cyl. Hope this helps! Let me know if you need anything else.