Rapid knocks.clicks from around brake pedal at start up

When I start my TB I here three rapid knocks/clicks coming from around the Brake pedal area...Any Idea what is going on...Dealer so far is driving me nuts and costing me lots...

Probably your antilock brakes testing the pump.....pretty normal. Some are pretty obvious, some aren't....but this isn't going to hurt anything.

Thanks...I never remembered hearing it before. Thought I was loosing my mind.