When i apply the brakes on my 190E and just when the car is almost stationary (ie not when it is starting to slow down), the car starts to make loud screeching noises. I changed the brake pads and the noise remains? This does not happen all the time but a general rule of thumb might be that it occurs when braking at low speeds (eg, in traffic jams).

Can anyone enlighten me on the cause of this? Could it be that I need to 'wear' the new brake pads out before the noise will go away altogether?