[G-CPTN]

Originally Posted by VBV_18Y

Ah yes, cheers for that, right what it does is, when i fire her up the air system makes a knocking sound, it goes pssshhh knock.


http://www.youtube.com/watch?v=plGoxQG9KvU you can hear it in this.

I cannot identify the problem from that (other than the air pressure isn't building).

Check for where any air is leaking around the engine with the engine idling (the pressure should still build). If there is no air escaping then you could have a stuck non-return valve somewhere.

Do you have access to anybody with 'experience' who can look at your vehicle? I suspect that there are other buses parked adjacent (from the earlier video) - or have they towed it and dumped it in your driveway?

In the earlier video everything seemed to be working just fine - so what has happened in the meantime?

Seals and diaphragms do perish (and stick) - you just have to find out where the trouble lies before spending money on replacement parts that might not be necessary.