Brake noise at low speed stops?
 

Just got a new set of brake pads and rotors installed about 2 months ago, the rotor used is the EBC GD slotted and drilled and the pads are Hawk HPS.

The brake works well but I can hear a grinding noise when braking at lower speed(below 20MPH I think) sometimes. The noise did get a little more frequent lately.

I know the Hawk HPS pads are not quiet but this is definitely a grinding type noise, not loud brake noise. No noise when I'm driving, braking really hard, or braking at high speed. Only when I apply a moderate amount of brake while trying to stop from a lower speed. And the brakes does work well despite the grinding noise. (I believe the noise is from the front wheels but not 100% sure.)

Anyone had similar experience with EBC GD rotors or Hawk HPS pads? Anything else that might cause this problem?

Haven't used those rotors, but I would expect a slotted and/or drilled rotor to make more noise than a plain one.

your best bet would be to take the wheels off and check to see if there is any signs of damage. maybe regreese the slides while everything is off. i had the same thing and greesed the slides and now she is nice and quite

By slides, do you mean the two pins that the calipers slide on? If so, they are designed to be reassembled dry, and should never be greased. High temperature grease should be applied to the ears of the pads where they contact the calipers.

Drilled rotors make noise during stops. It's a "feature".

Even the PFC 'Direct Drive' rotors on my M3 make a subtle grinding-like sound.

Granted, you should check that everything is ok and no debris is between the pad/rotor, but likely it is the nature of the beast.