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I don't think there is a quick release valve on this truck, I think the parking brake exhaust is through the handbrake valve.
Here is the picture of the dual COV arrangement but I've labelled it this time.
The spring brake is on port B
Port A is a feed from the emergency brake release in the cab, so under normal operation COV2 always takes its air from port C
Port D is from the handbrake valve, port E is directly from one of the air reservoirs (one of the two footbrake reservoirs)
I don't see how the handbrake can be applied, since there seems to be always pressure in COV1. I've obviously missed something
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