There are times on mountain roads where people group up and when this happened to me, I sometimes let people close behind me pass me rather than 'brake check' them. And more often than not, the driver, having passed me, slowed down because it is harder to be a lead driver on winding roads with glare on your windshield than to be a follower.
That didn't turn me into a brake checker, at least on mountain roads, but, in my youth, I did occasionally brake check folks who were tailgating me. I do not do it anymore. I did not cause any accidents, but on one occasion I came damn close.

I now practise mandatory courtesy. I do not believe I can 'teach' anyone to drive better by my own poor driving.

If someone wants to drive faster than me, I let them by. If they are tailgating where they cannot pass, and I feel it is a safety issue, I let my car coast to a slower speed, then accelerate back to highway speed. If this does not work I repeat the procedure.