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I got the pads on the front brake of my bike replaced 2 weeks ago. Immediately I heard a rubbing noise at low speed. I thought this would be ok - that the pads just had to be worn in or something, but 2 weeks later the sound is still present, though it had diminished a little.

Is this something I should be concerned about?

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If you feel it's an issue, I'd take it back to the mechanic who replaced them for some diagnostic. It does take a while for brake pads to get broke-in or bedded. I guess it really depends on how far you've actually ridden the bike ... some people might ride a thousand miles in a week. Others might only ride 50. It can take somewhere around 500 miles for car brakes to become bedded, I'd assume it's as long for bikes. –  Paulster2 Feb 23 at 18:53
    
Is there excess heat coming off of the brakes? It could potentially be a caliper sticking. It's not uncommon for calipers to choose to fail when brakes are replaced (since the pistons are pushed back in and dirty, exposed parts of the piston are forced back past the seal). –  Brian Knoblauch Feb 25 at 17:59

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This isn't unusual. I'd go as far as to say I'd be suspicious if I had a shop replace the front brake pads on my motorcycle and didn't hear them skimming the rotor a little. It's normal for the pads to touch the disc a little, and it's especially audible at low speed and after a fresh install.

Now, that said, if the pads are indeed rubbing enough to slow you down or become hot when you're not using them, you should be concerned and seek to rectify the problem.

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