Front Brake Making Nocking Noise!

[QAS]

Hi guys

I changed the front Brake Discs and Pads last week on my Yaris D-4D, I purchased the discs from local Part shop and Pads from Toyota main dealers.

Installation went smoothly, but now every time i brake i hear the knocking like some one is hammering, from the front driver side wheel. I have checked and re-installed the brakes discs but the problem remains.

Knocking is not very loud but it is anoying me a lot and i can't figure out what it might be. Could the disc be faulty??

Any advise is appreciated.

Thank you

QAS

[calgon]

err the only time ive had that is when i dident tighten my wheel nuts to the correct tightness.