Another squeaky brake!!

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I have recently bought a brand new mountain bike which is near perfect. The problem is that my front brake squeaks every time its wet or humid. I dont have this problem in normal dry conditions. Ive tried nearly every trick I know from adjusting toe-in, sanding down the pedal just a little, and I even replace the pads! What else is there. Thanks in advance.

Take a little steel wool to the rims. If you've replaced the pads, it's likely that's not the issue!

If the rims are aluminum, I'd use aluminum wool or something neutral (like 3M stuff) to etch the rim. Using disimilar metals like steel on aluminum can cause corrosion.

If you've got v-brakes, sometimes a little toe out can do the trick. Using an abrasive on the pedals is unlikely to help prevent squeaking brakes.

If all else fails put oil on your rims;) (that's a joke)