Weight paint brush stopped working

Hi, I was working on a character model. After finishing everything I added the armature, and started weight painting. It worked PERFECTLY, finished one of the arms no problem, then I go to the chest area and bam nothing happened when I painted. I went back to the bones I had already assigned weights for and still nothing. It just stopped. Any clue? Here’s the blend file. Thanks in advance!

Xavos Rig.blend (1.9 MB)

I found out that my brushes’ weights had been lowered to 0 for some reason. I guess that’s it