Replacing the PM is the easiest - no conversion issues to be considered - if you don't want to deal with the high maintenance of the PM anymore then hydroboost is the way to go
Many like the vacuum conversion but I'm not for it in a turbo charged vehicle
JMO
In that case, check close for leaks
It may even be worth sliding the master cylinder off the booster can and checking for leakage into the booster
If you cant find any leaks at all anywhere, the only other possibility is the master cylinder
vacuum brakes are real simple
I have seen new parts...
Pedal to floor creep is a classic symptom of a dying master cylinder
The only other thing that will do it is a major fluid leak that would be obvious to the naked eye
Depending on where you got the replacement cylinder from it could be the cause
When it comes to the powermaster dying, you go full rebuild or complete replacement
When you replace it, its either another PM as a direct replacement or a hydroboost or vacuum system replacement
How do you know its on its way out?
Run a diagnostic procedure on it to be sure
If the pedal isn't returning completely then there there is something wrong in the master cylinder or the pedal itself is hanging up mechanically - disconnect the actuator rod from the pedal and you can find out for sure
Guessing you are still running the Powermaster, then its not as simple as...
Sorry for the late response - been busy with the personal life
The PM doesn't like to sit - if you know the vehicle won't be driven for a while pump it down
It sounds like your acc is saturating - this can happen when it sits
The pressure constantly sitting on the bladder and keeping the...
The is the main page for the diagnostics info
http://www.gnttype.org/techarea/brakes/brakespage.html
Check out http://www.gnttype.org/techarea/brakes/PwrMstr.html
AKA, Fix your PowerMaster parts 1, 2 & 3