"Thud" on startup [Archive] - Audi Forums

: "Thud" on startup

06-01-2012, 03:35 PM
2002 Audi A6 Avante. Upon initial startup, there is a "thud" that happens within the first minute or 1/2 mile. It only occurs on the initial drive of the day. Someone suggested that it is the ABS self-test. Anyone heard of this? Normal? Fixes?