had loud cluncking noises. when going over bumps on my 2004 tdi a6 .after reading threads for front knocking on audi sports i took it to mechanic. who found the problem to be the retaining clips on the back of my brake pads had broken off making the rear pad rattle and the sound amplify through the brake backing plate ..very embaressing going slowly over bumps in front of people .even causing them to point and even tell me about the noise in case i didnt know ..happy to say a new set ofpads and some copper grease and all is well ..hope this help sombody who has noises sounding like every thread on front end clunking
