By Scirocco: In some rare cases i had to use a Syringe on the bleeder to press the brake fluid from the caliper to the MC. Air bubbles goes easier up than down the brake line.
In case it needs to be said, he would have to temporarily remove the MP mini-bleeder, then re-install it to bleed the brakes.
Or he could unbolt the caliper, shim the brake pads as tight as possible, and elevate the caliper with the bleeder nipple pointing upwards >> this is how I've done it. mine is just a single disk, so I haven't had any problems doing the job.