Knock noise when coming off the brakes

[fordmondeoman]

Gday,

every 3rd or 4th time i come off the brakes, there is a knock noise.
cant fault anything, but have heard that this is possibly a common or at least
knowen issues for the mk4 mondeos.
But i cant seem to get any info on what it is and how to fix it.
Anyone out there know what it is?

Thanks