Most intense brake run?

Spinning Mouses are pretty bad, as is Raptor Attack (former Rat Ride) at UK's Lightwater Valley. Hosts warn you before the train departs!

Tennessee Tornado has some abrupt brakes. You're heading in at such a high speed that you actually get a crazy ejector air moment in the front row

I wouldn't call Tennessee Tornado bad or painful, but definitely the most intense brakes at Dollywood, especially in the front car. It's seems worse when they are running 1 train. This is my only Arrow Coaster as of now, can't say how others compare on the brakes.

Both now long, long gone but the Mouse and The Black Hole at Alton Towers spring to mind for me.

The Mouse in particular had a very violent stop at the end of the ride.

Out of the coaster's I've ridden, Superman: The Ride and Titan probably have some abrupt stops. Titan's mid-course is infamous for coming to a screeching halt, while Superman you'd think by now would have an incident where one train fails to stop and hits the other train.

Another vote for Goliath's MCBR at SFMM, as well as Full Throttle's final break run.

Apollos Chariot in 3 train operation when stacking