I had my front brakes replaced about three weeks ago, about a week later I started hearing this faint knocking noise when I drive over the speed bumps in my complex, it is very faint and can't be heard when the radio is on. This weekend however the brakes made a knocking noise when applying a bit of pressure, which is quite worrying as it was replaced not too long ago. I don't know if these noises have something to do with the brakes, and if something was not properly fixed or the brake pads are moving around causing the noise?