I have an 2001 Grand Dodge Caravan with Front Disc and Rear Drums. The front calipers rattle over uneven surfaces. I took me a while to figure out where the rattle was coming from. If I apply a small amount of pressure to the brake pedal when it's rattling it goes away. I've replaced the caliper bolts and pins and greased it well. The rattle goes away until the grease starts to thin out then the rattle comes back. Any thoughts? Is there a modification for this problem? Thanks