Long Travel Soft Brake Pedal
I haven’t read all the replies but double check that you have the brake pistons mounted on the correct side of the car. Yes, I know, it sounds dumb but I did it!
Because of the internals of the pistons (drawing a blank on what they’re called) I had an air pocket that I couldn’t bleed out. The instructions weren’t that clear and the parts were symmetric so they easily mounted on the opposite side.
I swapped sides and then Presto! A good bleed and rock solid brakes!!
Hope this helps,