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Tandem Cycling A bicycle built for two. Want to find out more about this wonderful world of tandems? Check out this forum to talk with other tandem enthusiasts. Captains and stokers welcome!

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Old 03-03-13, 03:44 PM   #1
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Join Date: Mar 2013
Location: UK
Bikes: 2 halfs, 1 full
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Adjusting a Karasawa type drum brake


I'm hoping someone can give me a hint here.

I'm in the process of resurrecting our old tandem that has been quietly seizing up in the shed for a number of years (along with my knees!).

The putty - sorry grease - in the bottom brackets has been replaced, the chains etc. de-gunged and now its time to look at the brakes. The next is the rear drum/drag brake.

This is marked as a Primax-80 but I can't find anything about it on the Internet. It looks like the Karasawa unit that is sold by SJS Cycles (

Now for the question :-
Does anyone know what adjustments these things require?
There is a screw opposite the actuation lever - what does it do?
I'm trying to avoid fiddling until I have a better idea of what I'm fiddling with.

On one web-site I have looked at - the writer expects to be able to lock the rear wheel using the drum break with the stoker seat empty. Mine can't, so I assume I have room for improvement.


ps. Hope this post works - first attempt.
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