Brake Noise in Ford Fiesta

Hi,
I have been hearing rattling/cluttering noise, whenever I apply brakes.
The noise comes from the front-right side of the car.
I gave my car for service & got this problem rectified last week.(1st service after 7 months-used car-2007 model-purchased in Nov.2012)

The problem was with the ball-&-socket joint. The joint was so loose that holding the ball in my hand & shaking it, the rod used to swing easily. With that I also got the disc machined, for achieving a flat & smooth surface.
I got the ball-&-socket joint replaced with a new pair - the noise stopped by doing both of the above.

Now, after a week, it has again surfaced - though not so loud, but still frequent, as before.
Please help me in identifying the root cause of this problem.
I am worried.

Thanks,
Vikalp Luthra.

Source: http://www.theautomotiveindia.com/forums/technical-zone/13416-brake-noise-ford-fiesta.html

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