Hyroboost questions

[TJ Hopland]

I have had trucks in the past with this system and dont remember them seeming much different than vac boost systems but I never really had to do any brake work on any of them.  My current project car seems to feel normal and stop fine.  I have not tried to skid the thing yet but in normal driving have not had any feeling that there was an issue.  Today I noticed that the pedal does not feel any different with or without the engine running.  It goes down easily about 3/4 of the way then even easier the last 1/4.  It never gets firm.  I pumped it a few times with the engine running and in gear and it seemed like the brakes were fine. After about a dozen pumps with the engine not running it did not change but I heard something leaking.  Looked around and found it was fluid out the filler cap of the pump.  Level seemed normal a few days ago.  I dont remember my trucks acting like this.   This car has a fairly new looking caliper on the front and a new hose but the rest looks like it has been there for a while.  One of the rear calipers may be stuck but I have not had time to fully investigate.  Power steering seems fine so I dont think there is anything going on with the pump.  

[Dave Shepherd]

Might be some air the system from the prior work, but sitting still you can get the pedal pretty far down normally.