2002 A4 SE Avant Weird knocking noise at rear

[Tanuki]

I've never noticed it before but when in stop-start traffic, after rolling forward and then braking, there is a 2-3 second delay and then I hear this soft knock sound from the rear. Every move forward followed by a full stop I hear.

Doesn't sound like anything wrong really, but then what would I know?

Brakes work fine, actually car going great. Just hoping this isn't early warning for something.

BTW no, there is nothing in the boot rolling or moving around.:biglaugh:

[diogenis]

Is it possible the sound you hear is the gas in your tank?

[Dave Avant]

Check the spare wheel well for an object but as above if you have more than a 3/4 tank of fuel it sloshes about making a dull thump sound.

I noticed this on mine!! Once near 1/2 tank and below, no noise.

If it was something like brakes or suspension orientated then it would do it more or less instantaneous.

[davelympany]

I've never noticed it before but when in stop-start traffic, after rolling forward and then braking, there is a 2-3 second delay and then I hear this soft knock sound from the rear. Every move forward followed by a full stop I hear.

Doesn't sound like anything wrong really, but then what would I know?

Brakes work fine, actually car going great. Just hoping this isn't early warning for something.

BTW no, there is nothing in the boot rolling or moving around.:biglaugh:

hi there did you find hat the noise was, our A3 developed a strange knocking noise under rear floor...driving me crazy

dave