Is slowing down 20 mph below the speed limit the same as brake checking?

I have a pet peeve for people that ride my ass on a 5 lane interstate and I'm not even in the left lane so I'll slow down to about 50 mph so they take a hint and change lanes. My guess is brake checking is slamming on the brakes really hard versus just a normal slowdown like I do. Opinions? Anyways is this illegal? It's not safe to me having someone 2ft behind me when I'm doing 70mph. I did this the other day and the guy got so pissed. It's not my fault he's wreckless.

Is slowing down 20 mph below the speed limit the same as brake checking?
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