Hi guys, be very grateful for some advice here. My son has formula B4 brakes, one of which was leaking from the piston. I have ordered another pison assembly, but for the life of me can't work out how to get the old one out. I think there is a special tool but this is not imported into the UK. Does anyone know, is it just a matter of trying to pull the old assembly out with some pliars, I have tried it, and it just seems to tear small pieces of plastic off. If my question isn't clear, just let me know and I'll post back with more details.