Audi A6-A8 roller brake test

Audi
Audi A8/A6
A6 & A8 vehicles are fitted with an intelligent system.

ATL mode. When the rear wheels are placed in a brake roller tester as per MOT test and the rollers start to rotate the car automatically goes into test mode. A warning tone will sound and the instrument panel will display a message "Parking Brake Test Mode", the parking brake switch can then be applied in the normal way to engage the parking brake and thus give a reading. Please note that the parking brake is applied in stages when the switch is used, the switch may need to be operated for up to 4 times before maximum effort is achieved. (This is only when in test mode). After the rollers stop and the car is moved out of the rollers the warning on the instrument display will go out automatically.

Non ATL: As the wheels are rotating singularly the system will not recognise test mode. Therefore when applying the park brake the switch must be held until maximum effort or wheel lock is achieved
Note:This only applies to the EPB.
Quattro models:Though the Service brake is usually tested using a decelerometer the EPB fitted to these models can and should be tested using an RBT.


All A6 & A8: The following message is in VSI
This vehicle may be fitted with an Electromechanical Parking Brake (EPB). The EPB on these models can be tested with the RBT Rollers both for non-ATL (running singularly) or if using an ATL both together. Non-ATL - With rear wheels in rollers activate the EPB and test each wheel in turn. Record the maximum efforts. ATL - With both wheels in the rollers start the rollers and wait until the Park Brake Function light (P with a line through it) has illuminated (after approx 5-7 seconds), activate the EPB and record the efforts. Note: In this test mode the EPB is applied incrementally and it may require up to four operations of the switch to achieve maximum efforts. Note: The EPB test function is disabled when the vehicle is driven so it is not possible to test the EPB with either a plate brake tester or decelrometer...