The Bradbury bikes cracked like any other bike. I have about 9 that need repairs ranging from head tube cracks, all the way to broken down and top tubes, cracked seat tubes and broken off chainstays. Aluminum was pretty new back then and bikes that were ridden hard would break. I don't think any one manufacturer was immune to it.
However, I would think that compared to Answer made bikes Doug's bike faired a bit better.