Ok I made the mistake of thinking the Check Valve would be a easy replacement. It was, but now I have brakes that are basically hard to push down to get the vehicle to stop. Feel different than before, I have no vacuum in the system now. When I took off the old check valve, I heard the vacuum in the brake booster release as it made the sound. I replaced the check valve, turned the engine on and rev the engine to see if I get some pressure in the brake booster, drove it around and the brakes were hard to push down to stop. Went back and took off the new check valve and no vacuum sound, put on the old check valve and still hard brakes. So what I am doing wrong to get pressure into the brake booster?