Join Date: Apr 2002
Location: Montréal (Québec)
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Originally Posted by AndrewP
If the little adjusting screw just above the arm pivot is on the RH side of the bike, you unscrew it to move the RH pad closer to the rim and the LH pad further from the rim.
The attachment below (if it works) shows the little bolts AndrewP is talking about.
Normally, you should either unscrew the bolt on the left side, or screw the bolt on the right side. Just make sure you don't turn them with a tight grip as they are tiny bolts. Depending on the brake, you either need a small Phillips screwdriver or a 2.5-3 mm Allen wrench. Once things look OK, apply the brakes 2-3 times and make sure things are still centred. It's a bit of trial and error, but if things work correctly, you will definitely see an improvement when you turn one or both bolts.
(BTW, some brakes have only 1 bolt on one side).
There are however a few other things you should check too.
1st check (even before the above adjustment):
Check to see that the wheel is straight. If the wheel isn't, there will be a point where the brake pad will rub. If you spin the wheel and the right pad rubs at some points, then the left one at other points, you first need to true the wheel. I doubt this would be your problem, but that's the first check anyway.
2nd check (also before the above adjustment):
Try to wiggle the brake arms left and right to make sure that both arms move freely. If they don't move freely, then you should first remove the brake arms (release cable tension first by removing the noodle from the arm) by unscrewing the big pivot bolt at the base, then adding grease on the pivots. I have do do this once per year on my commuter bike which is used year round, including today at -30 C.
Make sure nothing prevents free movement of both brake arms. For instance, on my touring bike, the panniers may touch one of the brake arms or the brake cable, and that would pull the brake to one side. From what I've seen, it's especially a problem with large frame sizes (I have 25" frame bikes).
Last edited by Michel Gagnon; 01-14-04 at 10:03 PM.