Hi Terry
I think the rattle you are experiencing is from the pads. Did you make sure to take off the clip from the back of the old pads and put them on the new ones? ( just the pad that is against the piston side of the caliper)
If those are missing, you can also get this anti rattle (almost paint like substance)that you put on the back side of the pad( again, the one on the piston side)(inner). You will know if it is the pads by going the speed so it starts rattling, then when you apply VERY light pressure to the brake pedal and the rattle goes away---that'll be the culprit more that likely. Also, the metal tangs that warn you when the pads are getting ready for replacement may have been accidentally bent thus prematurely giving you the warning.
hope that helps
happy motoring
Rob
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