So, first off, I am a new member, yay! Im a forum addict, went from car forum to car forum. Now that I have started to work on my 8 year old project, some problems have come up. I own a 68fj40, sbc327, and a list of other mods. I recently installed a 79-85 minitruck booster with a 90 4runner MC. I believe its a 15/16 bore. Brand new lines to the front disk calipers (70's fj40 calipers). Brand new lines to the rear (monte carlo gm calipers.) And I have also installed an ssbc proportioning valve. I did however, not notice any residual valve on this 90 MC, Im not going through a dist block, just one line for the rear, and one for the front, coming out of the MC. So I bled, bled and bled. With the back brakes cut off (with valve), I get drag on the back (small amount). The pedal feels rock hard, and front brakes work good. When I slowly open the valve to allow more pressure, At a certain point, it goes from a rock hard pedal, to a spongy soft to the floor pedal. Now the rear brakes work, OK, but the pedal goes to the floor. The way I have the brake pedal setup, is, the MC bottoms out on rod travel before the pedal does. PLENTY of travel. I just pulled the ssbc, and am wondering if its faulty, or im missing something. I'm ready to drive my rig, and this is holding me back. Thanks for any help!!!