I don’t know. If they haul you up to 150 feet and drop you, you assume a certain amount of risk if the brakes don’t work. It’s simple physics.
We used to have a metal ferris wheel where I worked. When it got stormy looking, you kept the wheel going until you heard thunder. Then you closed it. You just took the risk that the wheel wasn’t one of the first things hit. It took a while to unload everyone.
I don't feel that way when you ride an elevator. I kind of trust the cables won't snap, don't you?
I wouldn’t ride these things no more. The Tilt-a-Whirl is a good way to get a detached retina. I might go on The Swan again if I had the chance. That was my first ride. A huge wooden boat shaped like a swan that went around slowly in a circle.
There are more than one system of brakes, involved, just for that reason. It’s called “redundant redundancy”.