tipsy

Hello and thanks for allowing me in. This is my first post here. I just this weekend bought a 2015 Traverse LT with AWD and the 2LT package. I just noticed a squeaky rubbery sound from under the dash when I move the brake pedal. I can move it in and out and it squeaks either direction. I tried some waterproof silicone spray on all the joints I can see but unless it works itself in after a day, it did not help.
Has anyone else experienced this? It's only slightly annoying when the radio is on, but if it's quiet in the car it's more annoying!
Thanks!
Jeff