Sturmey-Archer X-FD Brake Shoe Failure

See other failures under 000.html.

Sturmey-Archer X-FD drum brake, brake shoe failed near pivot:

From http://www.flickr.com/photos/60126298@N08/sets/72157628061705610/with/6316583270/ as of 2011/11/06.

Failed after about 2 months use. Rider weight and typical use not given.

Excerpts from a rec.bicycles.tech posting. Here "end cap" presumably refers to the stamped retainer that is missing from the cam.

Subject: Re: Broken Sturmey Archer X-FD Pics
Date: Sat, 5 Nov 2011
From: Frank White 
Newsgroups: rec.bicycles.tech

About two months in something changed in the hub and
I had to take in a lot of slack from the brake cable. The braking
became irregular and the hub would drag slightly even with the brake
cable disconnected. I suspect that this was when the end cap came
loose [...]

One month ago, while riding in a heavy rain, the hub completely quit
and went squishy. When I got home and [opened it] I found the broken
arm and the loose end cap, as well as standing water inside the hub.

[...]   I put it back on the bike without the brake
attached and rode it while I waited to get in touch with Sturmey.

A month later Sturmey sent me a new hub. When I changed the brake
plate I found plenty of water inside the hub again [...]

It is unclear if the loose retainer contributed to the broken shoe.

It is unclear if water in the hub is expected use, or unexpected, and if unexpected if it contributed to the failure.