Sound when taking off.

Hey All.

I could use a little diagnosis help on a sound I hear. When I start the taco up, take her outa park and into drive, just as the truck starts to roll, I hear this 'bwewp' r2d2 type sound coming from the engine bay. Any idea what this sound is and if it is normal?

Tried researching, and somewhere, somebody mentioned ABS. Not sure if that is it. Kinda sounds like a pump or something.

Thanks.

 

ABS system

***edit, whipper beat me to it

 

did you check to make sure R2D2 wasnt in the engine bay? i'd start there....

 

Yea, unfortunately no r2d2 in the engine bay. Good to hear it is the ABS self check.

Thanks Whipper, for the quick reply. 15 billion asking the same question?! Good, I'm not the first one to ask.