You hear by rolling down the window driving at the road lining with fence/wall/building at 80 F ambient/23 C+.
It sounds like a axle noise, but the noise persist even you engage your brakes or it doesn't matter which steering direction you go. All i could say it is speed dependent and temperature dependent.
It really drove me crazy.
Here what I had done..
I thought must be a chip of rust or something at the rear brakes..suggested a Polish mechanics that work in a yota dealership.
Remove the brake pad, re- sand the rotors using low grit sand paper check ..
Noise still here
2nd try
take the pads out, flip the bronze shim at top and bottom of the rear pads. I notice there is a dot (hole marking) at the shim, even top and bottom shims looks identical, i wondering if I flip their position would make the noise stop. Also I see a little "wing" at that shim to slot at at the brake mounting bracket, I just want to make sure it is not rubbing the rotor during WOT. Use a screw driver to straighten it a little or make the clearence btw shim and the rotor larger,, and also sand the circumference of the rear brake rotor.
See shims below. Out of topic remarks- Bendix are made by Honeywell.. so you can add this to your aftermarket brake part supplier list.. in additional to Aisin/Advics/ACDelco/Centric Premium..
Noise still here
Took the hubcaps off... bingo..no more ticking noise.