I've had some issues identifying this brake, and while I do know its wtb and circa late 1980s-early 1990s thats it. Any information would be appreciated. To clarify the parts were not original to the bike frame, as its a 1993 diamondback arrival.

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    Its an interesting place to put the rear brake, down under the chainstays. Just being near the chain seems to attract dirt and dust, neither are good for braking.
    – Criggie
    Jun 17 '17 at 9:04
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    @criggie I had similar brakes to these on the rear of a mountainbike many years ago. The idea being (at the time) that the seat stays weren't strong enough for the brakes. They were a real pain to adjust.
    – KeithWM
    Jun 17 '17 at 15:20

Those brake boosters are definetely by WTB, you can see a logo on third photo. I'd gues that whole assembly is by WTB too, at least google images return very similar results (this post especially, scroll down a bit for a picture).

  • Just noticed that title includes WTB in it. Not much to identify here, eh?
    – Klaster_1
    Jun 17 '17 at 16:03

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