Go to the repair/maintenance section at the repairpal homepage and put in your car and see what it says about the belt. If water pump is timing belt driven then replace at same time. The brakes should be checked and replace as needed.
RepairPal Certified shops can diagnose and repair your 2004 Audi A8 Quattro. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.