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@Oliver Schick
There are no really steep descents on the Dunwich Dynamo. The main fast descent is the one towards Sudbury, which will feel uncomfortable brakeless, especially if you have to skid-stop for the traffic signal at the bottom (yeah, right). There's a brief moderately steep descent towards Sible Hedingham (shortly before the feed) which in the dark can surprise you, and a couple of other descents en route, but as I say, none that are really steep.
While the rolling hills towards the end can feel pretty leg-sapping after 100 miles, there is only one sketchy bit here:
https://maps.google.com/?ll=52.285258,1.482403&spn=0.003216,0.006899&t=m&z=17
It doesn't look like a problem on StreetView, but it can often be covered in all sorts of crap. I know plenty of people who've done it brakeless without issues, but if in doubt walk the short bit to the bottom.
Anyway, doing the DD brakeless is obviously not a good idea, but who ever rode brakeless because it was a good idea? You'll enjoy the ride more with brakes. Obviously. :)