2012 CRV. I noticed on the rear calipers there is an additional large bolt adjacent to the bleeder screw that I am curious what its function is. It has an extended bolt head maybe an inch or so long. It is stamped "B" in the caliper and the bleed screw has a stamped "A" identifier. I'm thinking maybe its a port for flushing out the brake?? Really sucks that Honda doesnt make service books available any more for reasonable price.