what would cause one front brake to lock up especially when it rains/

What is your question?

The right front brake locks up tight the first few times I apply them especially when it rains. If it is dry outside it will usually just pulls to the right quite hard. I pulled the wheel off and pulled the pads. they looked fine and are nearly 100%. I can find no leaks or any thing contaminating the pads. it only does it on the right side. any ideas on what else to check?

What makes this problem better or worse?

damp weather makes it worse

How long has your 1997 Dodge Ram 2500 had this problem?

since last october