Why are my brakes still have drag and heat up situation?

We need to start with finding out what brakes are locking up. Normally it is not all of them. Once we know what brakes are doing this then we can go from there.

Here is a guide that will help lift the vehicle so you can test this:

https://www.2carpros.com/articles/jack-up-and-lift-your-car-safely

Or you can use a laser temperature meter to find out which ones are hotter then the others.

https://www.2carpros.com/articles/how-to-use-an-infrared-temperature-meter

You are correct that this could be the valve but we need to start with knowing which ones are effected and go from there.

I attached the info below on this but again this is only going to make sense after we know which wheels are locking up.