Is the brake pad kit the OEM? Usually dark black moly grease is used on the back of brake pads for anti-squealing / anti-rattling and light brown silicon grease is for sliding pins.One is for, 'anti-squeal/rattle' to be used on the backs and ears of the pads. The other is lube for the sliding pins. I have no idea which color is for what. I would assume that thickest would be for the pins?