Is the Check valve located inside the Break booster or is it in the pipe that goes to the UIM?

The reason I ask that I am relocating the where it gets the vacuum from and I dont wanna not have breaks when I am full boost ha.

 

It was originally just off the UIM but was relocated to the brake booster side as part of a recall.
You can just look for the dot on the hose or pull it off and blow (its inside the hose).