octaneman

The proportioning valve is usually bolted under the frame on the drivers side just near or next to the shifter lever, if it's not there then the valve is incorporated into the abs system. There is a simple way to see if pressure is actually going to the wheels. Take vice grips and clamp the brake flex tubes and see if the pedal becomes rock hard. If it doesn't become hard then there is air in the master or the master leaks internally. If the pedal is hard, release 1 vice grip at a time and see if there is air in the line, by doing it this way you are forcing the brake fluid into 1 wheel instead of all of them. Start the engine when you bleed the wheels in the back, look and see if pressure builds with the abs engaging. If master proves to be OK and pressure still doesn't build, consider using a hand vacuum pump and force bleed it that way.

post your findings.