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What did I do wrong? (Ultegra brake question)(5 posts)

What did I do wrong? (Ultegra brake question)NewDayNewWay
May 31, 2003 3:09 AM
About a month and half ago I replaced my rear brake cable. Had no problems for a while, but was out for a ride and one of the brake pads was rubbing against the rim. Got out a hex wrench and adjusted the small screw on top of one of the brake arms to recenter it. No problem. About 20 miles later, had to do it again. After a week or so this remedy no longer worked, and I realized that the entire brake assembly was loose. So I'd get out my 5 mm hex and tighten the entire brake assembly. Then, if I hit a big bump, or even if I put my bike down after carrying it, the brake would twist. So at this point I thought "well it's just not tight enough" so got out my big ol' torque wrench and tightened that baby up. After another week of retightenings, I've now completely stripped the bolt (my wife will attest that I'm a chronic over-tightener, which may be fine for some parts of a bike, but obviously not others). I managed to get the brake assembly off the bike by literally taking it appart. So, now I'll need to buy a new rear brake.

So what did I do wrong? (besides stripping the bolt) What can I do to prevent this?
Cable too short?Dave Hickey
May 31, 2003 3:27 AM
It sounds like the cable was too short. Everytime you turn the front wheel to the right, the cable hits the headtube and forces the brake pad into the rim.
Correction: Cable Housing too short?Dave Hickey
May 31, 2003 3:33 AM
I should't post when I'm not awake yet:=)
Correction: Cable Housing too short?NewDayNewWay
May 31, 2003 6:38 AM
Didn't replace cable housing, and housing was original housing that came with the bike.
re: What did I do wrong? (Ultegra brake question)Akirasho
May 31, 2003 8:50 AM
... an odd problem...

Rear brakes generally hold their "set" fairly well when torqued down.

Perhaps a twist or two of teflon tape and a drop of Blue Loctite will cure your woes. Also, make sure your washer is in place (you didn't say that you completely removed the brake... but might as well check).

Be the bike.