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If the 2 things are connected it could be warped/damaged/incorrectly fitted brake disc or similar. Could be the pads/pistons are being pushed back which is why you lose the rear brake.
Trying to think why it would be noticeable when decelerating, except the engine noise might hide it the rest of the time. I assume you've checked the rear wheel nut torque/wheel alignment and basic stuff. If it's chain drive the tension on the rear wheel changes when it's not being driven by the chain so could be something loose.
Airhead
So apart from my continued woes with rear brake pedal dropping to nothing (which still occurs intermittently and dealer so far have been unable to resolve) I now have a very noticeable knock/vibration that can be felt through the pegs, particularly noticeable when in deceleration. It's consistent with the speed of the bike and feels almost like something is catching or the wheel is wobbling? Seriously so pissed off I've now, got no faith in the dealer to fault find.
They'll happily charge me to take a look though, even though surely with the amount of effing about they have done with the rear end recently, it's gotta be related. I've contacted Triumph UK which was a total waste of time, they just refer it back to dealer