Everytime I brake hard, there will be knocking sound coming from somewhere on the passenger side near the left front tyre while the car is coming to a halt. (eg slowing down at roasd hump or stopping at traffic lights). When launching the car after the braking, the same sound will be there again. This does not happen during in gear acceleration or soft braking. Can any one tell me what this sound is and the cause thereof? Thank you in advance.