[oh fer... now what!??]

Hello, I'm new here. Please excuse any lack of punctuation. I live in the woods and am getting to grips, or not. With my daughters tab. I have a 1988 leyland library bus. I don't know what the chassis is based on but it has a cummins engine. I.ll upload a picture when I can get my head round it. Righg now though I needa little advice with the air system. I've had to bleed the clutch lots trying out different types of hoses because nowhere had the right type! Ive got hydraulic hose now but I don't yet know if Itll drive because air is leaking from under the throttle pedal. There is a rubber boot here that has slightly swollen with dot fluid. Is this all that 'was' holding the air? Or is it a piston type set up and somethings gone within it? I know it held just enough air before this boot swelled anyway, I do need to move before i can really start playing with things, forestry comission have left us alone for 5 months but now we need to go. Can anyone help me please? Thanks. Kate