!!!!Electronic Parking Brake Malfunction!!! Workshop!
 

It must be that time of the year again.

I replaced the left side connector and caliper with motor over a year ago and did a really good job of the wiring repair, I'm sure it is not that and have tested the pins of the plug that goes into the control module - At the control unit plug, the readings are the same on the left and right and as directly at the caliper plug, so think the wiring and motor are OK.

Attachment 17648 Attachment 17650

For around a month, I had intermittent parking brake error messages
and the left side has had "clamping for not reached" and "implausible pad wear" errors. See screenshot, group 3 is 13A left and over 15A right. 15.0A is the minimum permitted.

Attachment 17647

After lots of playing with VAGCOM, doing adaptations, pad wear recodes, fault code resets, disconnecting the battery, it got worse and sticks on almost every time I disengage it, and I have to turn car off for a few minutes and retry and then so far has been ok. The errors are permanent now.


The control module, and caliper connector were already replaced by Audi under warranty for the original owner in 2007 so the module is a year newer than the car. They made a mess of the connector which is why I had to do it again. As you can see below, the software version is 0230

Attachment 17649

I was wondering if other A8'ers can tell me their SW version from their VCDS scans and the model year of car.
Also, the label on the control module says 023 on it and I wondered if that was to do with factory SW version.

I saw one on ebay that had a 2013 manufacturing date! but the listing was pulled by the seller.

THANKS!


Address 53: Parking Brake Labels: 4E0-910-801.clb
Control Module Part Number: 4E0 910 801 D HW: 4E0 907 801 B
Component and/or Version: EPB A4EC0230 H03 0230
Software Coding: 0000221
Work Shop Code: WSC 00097 210 194805
VCID: 20446925F3957546B1-8075
3 Faults Found:

02432 - Supply Voltage for Left Parking Brake Motor (V282)
011 - Open Circuit - MIL ON
Freeze Frame:
Fault Status: 11111011
Fault Priority: 1
Fault Frequency: 8
Reset counter: 41
Mileage: 415760 km
Time Indication: 0
Date: 2017.12.18
Time: 08:56:39

Freeze Frame:
Voltage: 13.35 V
Count: 116

02596 - Rear Brake Pads Worn
008 - Implausible Signal
Freeze Frame:
Fault Status: 01111000
Fault Priority: 6
Fault Frequency: 2
Reset counter: 37
Time Indication: 0

Freeze Frame:
Voltage: 9.52 V
Count: 61

02428 - Left Parking Brake Motor (V282) Clamping Force Not Reached
000 - - - Intermittent
Freeze Frame:
Fault Status: 00110000
Fault Priority: 4
Fault Frequency: 4
Reset counter: 81
Time Indication: 0

Freeze Frame:
Voltage: 10.87 V
Count: 14

I'm not sure if this helps or not, but I had a couple of parking brake malfunctions recently in the cold weather - for about 3 days straight, however, I suspected that the cold weather and err, leaving my lights on all day meant that the battery was low.

Sure, enough, cleared the codes in VCDS, shoved the car on the CTEK overnight and voila, two weeks so far of driving with no parking brake malfunction errors and no codes logged.

Might be worth a try mate

Thanks mate - it does seem to be the cold damp weather, and it may have been low voltage that triggered it but I have had the charger on until 100% and left connected to no avail.

I have found that the connector under the battery for the controle module is the same on various models, A8 4H, A6 etc... and some VWs. So i looked at the pinouts in the current flow diagrams of my A8 and a post 2007 A6 and they are all the same apart from the hall sender pins are redundant (still there on control module end) but just two pin at the caliper end instead of our 4. I woud love to try one of these. On the 2007> A6, they updated the software to be more reliable, better voltage monitoring and algorithms - no longer has hall senders or counts revolutions and no longer has pad wear monitoring. All the pinouts for +, -, pressure switch, cluster lamps, CAN etc etc... are the same.

The Audi A8 4H 2010> is the same too. Hmmm. Could this be a mega upgrade?

The older Q7 and Phaeton had a mechnical pedal instead.

Attachment 17651

Attachment 17652

Attachment 17653

Snap, for your perusal, here is mine.
We have a 2004 3.0 TDI

Address 53: Parking Brake Labels: 4E0-910-801.clb
Part No SW: 4E0 910 801 D HW: 4E0 907 801 B
Component: EPB A4EC0230 H03 0230
Revision: --H03---
Coding: 0000221
Shop #: WSC 00196 067 57207
VCID: 204FCCB5F3268E46AA-8074

Thanks so much.
Looks like there were no SW updates after ours.
I bought a module for an D4 a8 4H0907801H
It did not work at all - no communication with it on CANBUS.
Now waiting for a D3 unit from USA.
Would still like to try an A6 ECU without the hall sender function.

Here is my ecu details:

-------------------------------------------------------------------------------
Address 53: Parking Brake Labels: 4E0-910-801.clb
Part No SW: 4E0 910 801 D HW: 4E0 907 801 B
Component: EPB A4EC0230 H03 0230
Revision: --H03---
Coding: 0000221
Shop #: WSC 00046 000 00000
VCID: 20486A13F3B91346B1-8074

No fault code found.

-------------------------------------------------------------------------------

Here is mine Snap +++

-------------------------------------------------------------------------------
Address 53: Parking Brake Labels: 4E0-910-801.clb
Part No SW: 4E0 910 801 C HW: 4E0 907 801 A
Component: EPB A32C0220 H02 0220
Revision: A32C0220
Coding: 0000731
Shop #: WSC 00654 210 91809
VCID: 1F4D0CE9CE3222C667-804A

No fault code found.

-------------------------------------------------------------------------------

Thanks chap - still waiting for my spare module to be delivered from USA.
Seems 0220 /0230 is the SW version.
It's also printed on the casing and (year 2007-) 0230 was the latest version until end of D3 production.

Well, I recieved the spare part yesterday and fitted it.
Exactly the same codes and behaviour, so looking at wiring loom or swapping calipers from one side to the other to see if the issue moves. I don't want to take the motors off as the casing split last time I did that on my old one.

You might want to do a continuity check on each of the pair of twisted wires from the Brake ECU to the Caliper to see if that throws up and issues - I ended up replacing each twisted pair with my car to all four corners as the casing on the wire was intermittently cracking and exposing wires which then touched and threw up faults at all sorts of times! My only difficulty with that is that I cant see that issue throwing up that particular fault but certainly continuity check the appropriate wires concerned