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Yep moisture and crap in the system are the real weakness of air brakes. Great description Awesomeness except you got the yellow park knob function backwards. You PULL it to vent park air and set the park brakes. You push it in to apply park air, compress the springs and release the park...

I disagree with this part of your description. Every air system I have ever played with, The springs are not used in normal braking. When park air was applied, the springs are taken completely out of the equation(caged with air pressure). The springs only apply about the equivelent of 60 psi...

> with parking air brake on; both front AND rear wheels should lock right? No. Only rear brakes have dual acting air cylinders and receive park air to release(compress) the park/emergency brake springs. > with air drained from tanks..... both front and rear brakes should lock right? No...