-The brake drum may be cracked.
With rear disc brake:-The brake disc may have extreme lateral runout or be mounted improperly.-The brake disc may be cracked. This would be dangerous
-Combination of soft brake pads and a directional finish on the disc surface. A directional finish may go away with use and take the noise with it.
Regardless of brake type:A brake disc or drum mounted to a bent hub flange or bent axle shaft can cause this noise.It might be a CV joint, when the CV boot is ripped and the grease is partly gone , then it makes noise.
Might be worn drive shafts or loose wheel nut
Depends on where the noise is originating from, a suspension component, engine (top or bottom?), steering knocking when turning, going over bumps, etc. You need to provide more details before I can point you in the right direction.
Worn front axle and/or front end component.
tie rods
Could be a bad CV joint or bad wheel bearing C.V. Joints need replacing
On a front wheel drive car probably a damaged constant velocity joint clattering
I would check the suspension bushings, if one of them is worn it would cause a knocking noise.
it might be the cv axel boots
Bearings misassembled, tire nosie, brake noise, noise in axle, noise in transmission, etc.
the sound that you are hearing is the transmission interlock solenoid. It is designed to keep the shifter in park until you put your foot on the brake pedal. it's normal to hear the solenoid disengaging the locking bar when pressing the brake pedal after starting the car.
Sometimes not all the time