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The other day, one of the front calipers on my wife's Micra stuck, causing the brake on that wheel to drag. I freed it off by winding the piston in and pumping it back out a few times, until it went in and out freely, and the brakes are now working correctly, however I'm wondering if it's just going to stick again pretty soon - in which case it'd be better to replace it with new? I couldn't see any sign of damage to the seals that could have allowed moisture into the piston, but the car doesn't get a lot of use.

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I've seen this where is was just a build up of dried up brake fluid baked into a ridge on the piston. Cleaning it off solved the problem. Your pushing the piston in and out may have rubbed it off.

If it is not leaking, I would just keep an eye on it for a while.

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  • There were definitely no leaks, that was one of the first things I checked!
    – Nick C
    Feb 26, 2020 at 13:56
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    @NickC it might be an idea to get an overhaul kit for the caliper and change the rubber seals and clean and lube the piston/cylinder. Feb 26, 2020 at 14:10

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