Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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It's been a while, so disregard this if it doesn't seem to match your brake. If I remember correctly 986 brakes used the same spring balancing system as the Sun Tours I'm still riding.
On side the spring engages a hole in the boss like any other brake. On the other the back of the brake is a large flat nut which is one piece with the bushing the brake pivots on. The springs leg goes into this nut, then is mounted on the post. Tightening the outer mounting bolt jams the nut so it can't turn. Once the brake is basically set up ease of the mounting bolt slightly and use a cone wrench (my Sun Tours take a 19mm) to rotate the block until the springs balance and the brake is centered. Then tighten the mounting bolt to keep it there.
BTW- it's important that the pivots are properly lubricated with oil, otherwise the arms are sticky and it won't keep the perfect adjustment. Also I have a bunch of cone wrenches for this, PM me if you need one.
Again, disregard the above if you don't have the flat nut in the back of one side.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance
Last edited by FBinNY; 07-17-11 at 08:32 PM.