First off, let me begin by giving my feelings on using any vacuum apparatus to bleed brakes. It won't work perfectly UNLESS you can open your bleeder fitting and still retain a perfect seal around the threads! Otherwise, the vacuum will suck air past the threads, causing bubbles in the bleeder hose, and wasting a lot of fluid needlessly.
That said, I bleeds all brakes with the procedure that my daddy taught me. It does take two people to accomplish.
First, get a Volvo manual of some sort to verify correct order. As I am currently unable to locate mine, maybe someone else here can post the correct order.
Worker A is at the caliper, and loosens one bleeder screw, then snugs it down, and puts a hose on it into a can/jar. Worker B pumps the brakes, and then holds pressure on the pedal while Worker A loosens the bleeder screw, then tightens it when Worker B says it is floored. Repeat as necessary, then top off the reservoir, and move to the next screw in the order.

Depending on how you bled your brakes, there is a good possibility that in draining the fluid out of the lines, there is a massive air bubble in a line somewhere. Get rid of the air to get pedal pressure back.

Dave