Squeaky brakes in the rain

Why is it that my breaks only squeak in the rain, they are fine any other time. Dealer check them during oil changes as said they are fine.

 

Same. After washing it, rain, or when cold, mine squeak the first couple of times I apply the brakes. Especially when backing up. Should be fine.

Due for some new ones soon, but mine have done this pretty much the whole time I've had the truck. Trying to research what to go with for the next round.

 

Find a seldom used steep hill. Get to the top of it. Put the Tundy in neutral and roll backwards. Slowly apply the BRAKES. Release. Then hit the BRAKES hard. Repeat a few times. See if that eliminates said Rainy Day squeak.

Oh. I just got a call from my lawyer. He wanted me to be sure and mention >>> YMMV.