My 2006 k2500hd brake pedal rattles when my eninge is idling, gernerally when the truck is stopped. It will happen if my foot is off the brake or even when i just have a little pressure on it. If i really stand on it, it will stop, or if i just give the truck a little gas.

I've grabbed the sensors, the rod and nothing i grab under there stops the noise so i cant fix it.

Any ideas?

Lube all the joints, check that the bushings are still in place.