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Rebuild it, it isn't tricky. Tbh throw them away and fit a 6 setup which you can rebuild first if necessary.
Think mine lasted the same mileage before the piston seals were shot.
Night Blue VW Golf 7 GTD : Bianca 306 Rallye : Mini Cooper D (The Mrs')
HDi Owner for 200k/9 years
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Yeah will be a stuck piston. Get them rebuilt or use it as an excuse to upgrade!
Team Eaton
1999 China Blue 306 GTi6 - Eaton Supercharged - 214.5bhp 181lbft
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Try squeezing back the caliper with the bleed nipple open (obviously watch out for spraying fluid). If it goes back easily it'll either be a blocked brake line or stuck sliders, you can check the sliders easily enough to narrow your scope. If the piston doesn't want to squeeze back then rebuild the caliper. Hth.