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Sounds like a possible air pocket in the braking system. Do you know how the bleed the brakes? They may need to be bled. Also, if you've added brake fluid recently, and didn't put the cap back on, it could create a suction. Another note is to check the cap to the brake fluid reservoir. It's rare, but, it could be bad.
Ok, it could be a few things, 1. bad break caliper. 2. if you have ceramic breaks, it could be a cracked brake pad, and if they are not ceramic they can still be cracked. 3. if you drive a lot then it could be that you need new breaks again.. 4. also have your back breaks checked along with the front ones..
You say you hear the noise when you "slow down". Does this mean you hear the thumping noise when you let off the gas and let the car coast to a stop or only when you are applying the brakes to decellerate?
If you only hear the noise while applying the brakes then I would assume it has something to do with your brakes. The first thing that comes to mind would be rotors that aren't true or warped which could make a thumping sound.
Do you feel any vibrations in your foot when it is applying pressure to the brake pedal? If you do feel a sort of pulsating feeling then it could very well be your brakes making the noise.
this noise is a vacuum leak at the power brake vacuum booster due to a tear in the booster vacuum diaphragm, u should have this replaced ASAP, it the leak gets worse the brakes will become very hard to push and will limit your ability to make a safe and timely stop.