Thanks for replying!
I did say hydrolic, but, yes, I really meant hydraulic.
If I have an air over hydraulic system?
How can I check that?
I did lose air before. The bus rear end was squatting down, and bus sit like this for a while. I ended up changing the purge valve and after that no problems with air building up and maintaining it. But only the parking brake light is now on with the annoying alarm.
The only thing that I know that works on air is the ride suspensions, but as I stated, everything seems to work now as it should. The ride height is normal, brakes are working, bus is rolling.
I can give you as much details as necessary, and even do pics and videos. Just need to know what I am looking for
Thank you for your help, really!!!