Make sure your rear calipers are installed with the bleeder at the highest point. When I installed mine I was more concerned with finding a good spot to mount them than the best position of the bleeder. So what I have to do is remove the caliper mounting bolts and slide the caliper up the rotor (or down depending) and hold it on the rotor by hand while bleeding the brakes. Then just remount the caliper. That's what I have to do...hope that helps.