Im not sure exactly what your looking for.
On any air brake chassis the air that is being delivered from the brake pedal is a signal that goes to a brake relay valve. The relay then provides air to the brake chamber directly from the air tank. The air tanks and relays will always be as close to the axle as physically possible. This design eliminates fade and delay. Otherwise axles further would engage and release slower than axles closer to the brake pedal.
So yes there is defiantly components between the pedal and the chambers, the brake relays and the antilock valves too.
In actuality the air coming from the brake pedal TERMINATES at the brake relay valves and it does not even go to the chambers. That air is supplied directly from the air tank by and through the relay.
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