you have to do the rears first

it's technically a 3 man job if you want to be extra careful

one person sits in the seat and presses the brake pedal softly

one person makes sure the fluid is topped up in the reservoir

one person is at the wheel opening the bleed nipple to check for air bubbles

all at the same time

but you need to leave it open for a few seconds at a time, but don't pump the pedal, any pressure on it opens the valve and starts the pump and it flows at one rate and is not variable

once both rears are done (they share one line so once one side is done the other side won't take much doing, then pop round to the fronts and pump the pedal to get the fluid around there

alternatively it could be a stuck relay on the pump power side of things