Quote:
Originally Posted by coachman
All modern air brake systems have a four way or multi protection valve fitted which should close off any tank that is losing pressure.
It might be that your vehicle has a separate valve for each tank as I don't think that there are any auxiliary systems that use air such as air assisted clutch ? But whatever the set up is the valve/valves have got to be in the main air feed from the compressor. Once you locate it with luck it might just want stripping and cleaning.
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As you have discovered from your COF, draining any one tank should not affect the other(s) - it's as simple as that.
As coachman has stated, recent vehicles will have to have protection valve(s) (also called pressure loss limiting valves) to prevent losing air with a single (pipe) failure. These operate like an inverse relay (ie no signal no delivery) as well as incorporating a non-return valve.
If your vehicle is 'old' (referring to it as KDLC5 rather than EJM would indicate this) it might not have these fitted, but just have non-return valves on each part of the air system (these might look just like a slightly larger pipe connector on the supply side of the reservoir piping) probably where the pipe from the compressor/sensing/condensing tank enters each reservoir.
I've got a circuit diagram (I can't find one online) that I will scan and try to post here - but it might not be today as I have to go out soon.