Load sensing valve

[VG33QX4]

Ok so I was thinking about my rear brake troubles. It feels like they are being used too much or grab to hard in cold conditions. Now this may be attributed to poor pad material due to age. However I am curious to know how does the load sensing valve work. When a load is put-on the truck. Does it make the rear brakes work harder? Aka send more pressure to them? I put the ome springs on my truck and was curious if now my valve isn't calibrated correctly. But if the way it works is how I say than this is not the case because it's higher now so the valve theoretically should be sending less pressure to the rear due to slight increase in height. Is this true thanks