What is the 'A' behind the handbrake of the Audi A6L?

[DelEmerson]

"A" refers to: the Auto-Hold button. After pressing this button, when waiting on a slope, stepping on the brake and releasing your foot will automatically engage the brake. A green P light on the dashboard will illuminate, preventing the car from rolling, and you can simply press the accelerator to start moving. How Auto-Hold works: When the vehicle is temporarily stopped and needs to restart after a short period, this type of parking is handled by the ESP-controlled brakes. The computer uses a series of sensors to measure the vehicle's levelness and wheel torque, determining any tendency for the vehicle to roll, and applies an appropriate braking force to keep the vehicle stationary. This braking force is just enough to prevent the vehicle from moving without being too strong, ensuring there is no severe lurch forward when pressing the accelerator again. Meaning of the Auto-Hold system: The Auto-Hold system is an automatic function that replaces the handbrake. Once activated, for example, when stopping at a traffic light, it eliminates the need to pull the handbrake. This function is particularly useful on slopes and during frequent stops and starts.