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Ok… what type of knocking? is it a single big knock or bouncing knock knock does it sound sharp and harsh or more dampened and springy is it only under braking or can it happen going over small speed bumps at low speed. does it come from the middle or sides of the car? with a passenger in the back seat so they can put their head out the window each side and tell which is louder. Go over a speed bump forwards then backwards. turn the wheels and look at the lower alloy arm rear rubber bush for cracks. Phone camera will show cracks better than you can see. a tire iron or crow bar applying a bit of force under then can show cracks better. its a common failure on the 2007-2013 until them swapped to ball joints. Whiteline did do balljoints for Motorsport use that pretty much like factory ones. bushes are reasonably easy to get eg BNT or others have replacements https://whiteline.com.au/search/popular-parts-for-subaru-impreza-2008-wrx-sti-gr-hatch/front-control-arm-lower-inner-rear-bushing-double-offset-kit-to-suit-subaru-forester-impreza-lib-9986-kca334.html https://whiteline.com.au/search/popular-parts-for-subaru-impreza-2008-wrx-sti-gr-hatch/front-control-arm-lower-inner-rear-bushing-kit-to-suit-subaru-forester-impreza-liberty-outback-9986-w53353.html

Does it do it if you just coast to a stop without braking? What about if you use the handbrake to stop?

Is it like a single knock as something moves forward when you brake or a repeated knock/clunk when doing so?