Audi A8 (4E) Parking Brake

From Ross-Tech Wiki

Coding

Note: When replacing this Control Module it is necessary to perform the Basic Settings Function Test (MVB 010) and Longitudinal Acceleration Sensor (MVB 020) first. This sets a Readiness Bit for each of the Basic Settings, Coding will not be accepted without having done this first! Make sure to adapt the Brake Pad Thickness after Coding the module.

  • 000??xx: Engine
    • 01 = 3.0l MPI (Gasoline)
    • 02 = 3.0l TDI (Diesel)
    • 03 = 3.7l MPI (Gasoline)
    • 04 = 4.0l TDI (Diesel)
    • 05 = 4.2l MPI (Gasoline)
    • 06 = 6.0l MPI (Gasoline)
    • 07 = 5.2l FSI (Gasoline)
    • 09 = 4.2l FSI (Gasoline)
    • 10 = 4.2l TDI (Diesel)
    • 12 = 3.2l FSI (Gasoline)
  • 000xx?x: Transmission
    • 1 = Multitronic (VL30)
    • 2 = Automatic Transmission (AL420)
    • 3 = Automatic Transmission (AL600)
  • 000xxx?: Country
    • 1 = Rest of World (RoW)
    • 2 = USA/Canada
    • 3 = Japan

Adaptation

Channel 006: Pad Thickness

Enter the measured thickness of the new pads (excl. back panel), round down to the next lowest integer.

  • Range: 3 - 14 mm


Basic Setting

Caution!

  • Do not perform any of these Basic Settings while the brakes are disassembled! Opening, closing, function tests, and otherwise cycling the Electronic Parking brakes should only be done with the pads and calipers properly installed on the rotors.
  • Please follow the procedures EXACTLY. There's a reason for every step. If you skip any prerequisites or other steps here, you are likely to experience "issues" for which no documented resolutions exist, in which case we will not be able to help you resolve them.
  • It is strongly recommended to run a full Auto-Scan first thing to check for any preexisting faults! There have been several reports of repair shops damaging the Electronic Parking Brake System when trying to do rear brakes, but not telling the customer and then sending the car out the door.

Open Rear Parking Brake for Pad Change

Prerequisites:

  • Connect a battery charger as per repair manual, click photo to enlarge.

A8 charger hookup.jpg

See Special Notes

  • Cycle the Parking Brake ON, then OFF first.

[Select]
[53 - Parking Brake]
[Basic Settings - 04]
Group 005
[Go!]
Activate the Basic Setting.
[ON/OFF/Next]
The brake pads are now opening.
[Done, Go Back]
[Close Controller, Go Back - 06]

  • Turn ignition off.


The caliper pistons do not move back into the caliper, this is normal.

Note: Check/Change Adaptation Channel 006 (Pad Thickness) after changing the pads.

Open Rear Parking Brake for Repairs

Prerequisites:

  • Connect a battery charger as per repair manual.
  • Cycle the Parking Brake ON, then OFF first.

[Select]
[53 - Parking Brake]
[Basic Settings - 04]
Group 007
[Go!]
Activate the Basic Setting.
[ON/OFF/Next]
The brake pads are now opening.
[Done, Go Back]
[Close Controller, Go Back - 06]

The scan tool can now be disconnected and ignition shut off while mechanical repairs are performed

Close Rear Parking Brake

Prerequisites:

  • Connect a battery charger as per repair manual.

[Select]
[53 - Parking Brake]
[Basic Settings - 04]
Group 006
[Go!]
Activate the Basic Setting.
[ON/OFF/Next]
The brake pads are now closing.
[Done, Go Back]
[Close Controller, Go Back - 06]

Function Test

Prerequisites:

  • Connect a battery charger as per repair manual.
  • Cycle the Parking Brake ON, then OFF first.

[Select]
[53 - Parking Brake]
[Basic Settings - 04]
Group 010
[Go!]
Activate the Basic Setting.
[ON/OFF/Next]
The brake pads are now opening and closing 3 times.
Wait 30 seconds after the the brakes stop making noise.
[Done, Go Back]
[Close Controller, Go Back - 06]

Longitudinal Acceleration Sensor (G251)

Prerequisites:

  • System voltage at least 12.0 V.
  • Car parked on a level surface.
  • Do NOT move/rock car while performing basic setting.

[Select]
[53 - Parking Brake]
[Basic Settings - 04]
Group 020
[Go!]
Activate the Basic Setting.
[ON/OFF/Next]
The status of the Longitudinal Acceleration Sensor (G251) is now being displayed.
[Done, Go Back]


Special Notes

  • On vehicles using a separate battery management control module, make sure the charger is connected properly. The proper procedure should be found in the repair manual.
  • When 02596 - Rear Brake Pads Worn is stored after the pad thickness is adapted, try:
  1. Repeating the Function Test Basic Settings operation and make sure the stored value in Adaptation channel 006 did not resort back to 03. If that alone does not resolve the issue proceed to 2:
  2. Test drive the vehicle and scan it to see if 02596 - Rear Brake Pads Worn switched to Intermittent, allowing you to clear it.

Video Link

Electro-Mechanical Parking Brake (EPB): Rear Brake Service

Image4.jpg

https://www.youtube.com/watch?v=zFZJj39FZ3s