Knocking noise from the back when coming to a stop?

So yeah it jsut recently happened that when i go any speed and come to a complete stop while stopping it makes a knocking noise that goes about like every couple seconds. Like for exapmle, knock.... knock... knock... knock... stop. it sounds like its coming from the back what could it be? I had my rotors and brake pads replaced about 4000 miles ago so i dont think the pads are gone.

O well now that ive been driving i hear the noise all the time. It has to be something with the back left wheel idk if its the metal on metal sound i heard when my breake pads were gone. But yeah it will make the noise any speed i go now when i press the brake slightly the sound goes away but soon returns after presses down and stopping.

so i found the problem. My back driver side rotor was broken:banghead: so its not too bad of a fix.

glad you found the problem.