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V brake speing tension way off

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V brake speing tension way off

Old 10-13-12, 09:57 AM
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DOS
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V brake speing tension way off

A friend just brought over a kids bikes just purchased from toys r us for me to take a look at. First think I check on such bikes are the brakes because I always find that v-brakes on big box stores bikes are always off. Sure enough, both front and rear brakes were not centered. The rear brake came into center easily enough with a few turns of the spring tension adjustment screws. The front brake however centered only when screw on one side was dialed all the way down so spring was at max tension while screw on other side was dialed almost all the way out so there was minimal spring tension. My friend didnt have time to stick around for me to take brake arms off so I couldn't' check how springs were seated inside arms but am wondering if springs were seated in different holes inside the assembly. What else could explain the issue?
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Old 10-13-12, 10:11 AM
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It might be that these low end brakes have poor and poorly matched springs. I've seen some that had such poor spring properties, that the legs visibly bent over time.

OTOH, there are a few other factors to consider.

Often there poor lubrication of the pivots which can make one side so sluggish releasing that the other side takes up the slack. Use thin oil on both pivots to make sure that they're moving as freely as possible before balancing the springs.

Also check that the frame to brake loop isn't pulling or pushing it's arm (gently lift or lower the bike end slightly and see of the brake moves). This is especially on smaller frames where the loop is short and it's stiffness comes into play.
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Old 10-13-12, 10:17 AM
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Specifics, IDK, remotely ..
Generically.. Cheaper ones usually tool with most V brakes
Pliers... just put a bend in the straight spring wire.

really is not spring tempered at all .
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Old 10-13-12, 01:27 PM
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If there are multiple spring tension holes on the caliper mount, the springs might be inserted into different positions.
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Old 10-13-12, 04:29 PM
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Originally Posted by AlabamaCommuter View Post
If there are multiple spring tension holes on the caliper mount, the springs might be inserted into different positions.
Thats what I told my friend but I did not have time to take the arms off the bosses to check. They saved about a hundred bucks by buying at TrUs but would be well served spending that 100 at a LBS to tune the thing up.
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