Hi hoping someone can give us some advice on the front n/s brake sticking on.Was out driving earlier and when got home could smell a burning smell which i knew was a brake smell.Felt both wheels and the front n/s was hot.Jacked car up and removed road wheel.tried to turn brake disc and it was really stiff to turn.stripped the brakes down ,pads are ok and so is disc
.piston in caliper pushes back ok with g clamp .Pumped the brake pedal slowly to see if piston moved which it did but noticed brake fluid resevoir went to min (it was ok before hand as it was first thing i checked).so i topped up the resevoir and put evrything back together and pumped the brakes again but the disc was quite stiff again .

Iknow that the hoses also can cause issues but the piston moved ok.Any ideas ?cannot see any leaks anywhere .Drivers side is ok. p.s slider pins are ok.