this is for the sbc fly by wire brake system. we've been told if you dont de-activate/de-pressurise the system the piston in the caliper can shoot out with a mega force behind it, god help is if a finger is in the way. the pressure at the bleed nipple is around 100bar when bleeding, although it doesnt feel like it. it is possible however to change pads without de-activating it just lock the car with all windows up and bonnet shut but its a risk so the system is in sleep mode so to speak then.

obviously work for mercs, our charge is £115+vat or £92+vat for cars 3 years or older.