Bleeding procedure problems

[jcallmeking]

I changed my waterpump and thermostat n put in a new radiator and started the bleeding process on my 2008 535xi but it’s been more than 12-15 mins and it hasn’t shut off I let it run for another 12 mins only way it will shut off is when I take my key out the slot, but as soon as I insert and try to turn the engine on (no brakes) it turns on my screen and dashboard but my cars waterpump starts the bleeding procedure again so I decided figure it out another day since it was late and disconnected the battery for a whole day when I went back and connected the negative terminal again and inserted my key into the slot my waterpump start the procedure again, so now I’m stumped and have no idea what it could be or what I should do next

[Blackie_No1]

Sorry, I can’t offer any assistance but I’d like to ask how you do the bleed procedure?