Anyone know anything about disc brakes?

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lemonade

I just took the wheel out on my mountain bike, and now having put it back, there's a tonne more free play on the lever, the brake only starts to bite just before the lever hits the bar. What have I fucked and how do I unfuck it?

Brakes are cheap Shimano hydro, Acera I think, and have been excellent so far, I've never had to touch them until now.

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Heldring in reply to @lemonade

Maybe the brake was engaged while the wheel was out and the pads just need to realign. Put the wheel in and loosen the brake mount screws, engage the brake and tighten them up again

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snottyotter in reply to @Heldring

This would probably make the pads closer to the rotor and lever feel sharper, or worse when one of the pistons pops out, but the brake fluid everywhere would be a bit of a give away.

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