Audi · Canada · High
Audi A6: Brakes
Affects Audi A6 · 1997–1999 — about 9K vehicles.
The hazard
On certain vehicles, a control valve in the vacuum hose connecting the brake booster to the intake manifold may not open or close fully at temperatures below -4 degrees F. This condition could cause insufficient vacuum to be provided to the brake booster resulting in possible loss of power brake assist. Correction: A vacuum by-pass system will be installed on affected vehicles.
What to do
Contact your dealer; the remedy details were not included in the filing.
Critical — crash/injury risk now
High — injury risk; see remedy
Moderate — fix at next service
Low — minor / informational