Parking brake not releasing - Need help

[a8starr]

So my parking brake decided to not release tonight. Whilst idling the engine is still able to pull the car forward but warning lights flashing. The parking brake motor is making a sound and when flicking upwards it locks everything tight. Flicking down seems to half release the PB and car can move forward at idle but it feels like something is still grabbing the discs.

Questions

1. Does the rear parking brake lock up both rear wheels or just one?

2. Could water ingress or dirt in the connections cause weak motor function and therefore not disengage the callipers completely?

3. Are my callipers shot?

4. I have VCDS (bit of a newbie still) would this help me out at all?

I have a jack and axel stands in the garage also.

Any help would me much appreciated as I am not able to drive anywhere. http://forum.a8parts.co.uk/images/smilies/frown.gif

[zollaf]

a vcds scan would help greatly, you may get a code. it might be your calipers, the switch, the ecu. could be water ingress but whatever it is , its not going to be cheap.

[a8starr]

Here are my fault codes. First scan in 53. Parking brake revealed 5 faults. Cleared the faults then on 1 appeared.

Friday,14,March,2014,21:56:36:41609
VCDS Version: Release 12.12.2 (x64)

Address 53: Parking Brake Labels: 4E0-910-801.clb
Control Module Part Number: 4E0 910 801 A HW: 4E0 907 801
Component and/or Version: EPB AV1C1010 H01 1010
Software Coding: 0000221
Work Shop Code: WSC 02313 785 00200
VCID: 1D3108
5 Faults Found:

02432 - Supply Voltage for Left Parking Brake Motor (V282)
011 - Open Circuit - Intermittent
Freeze Frame:
Fault Status: 00111011
Fault Priority: 2
Fault Frequency: 1
Reset counter: 197
Mileage: 138544 km
Time Indication: 0
Date: 2014.02.24
Time: 17:42:05

Freeze Frame:
Voltage: 11.90 V
Count: 92

02429 - Right Parking Brake Motor (V283) Clamping Force Not Reached
000 - - - Intermittent
Freeze Frame:
Fault Status: 00110000
Fault Priority: 4
Fault Frequency: 1
Reset counter: 193
Mileage: 138312 km
Time Indication: 0
Date: 2014.02.22
Time: 23:41:47

Freeze Frame:
Voltage: 12.63 V
Count: 15

02431 - Right Parking Brake Motor (V283) Resistance to Movement
003 - Mechanical Failure - Intermittent
Freeze Frame:
Fault Status: 00110011
Fault Priority: 3
Fault Frequency: 33
Reset counter: 228
Mileage: 138264 km
Time Indication: 0
Date: 2014.02.22
Time: 12:19:46

Freeze Frame:
Voltage: 13.66 V
Count: 19

02433 - Supply Voltage for Right Parking Brake Motor (V283)
011 - Open Circuit - Intermittent
Freeze Frame:
Fault Status: 00111011
Fault Priority: 2
Fault Frequency: 2
Reset counter: 197
Mileage: 138152 km
Time Indication: 0
Date: 2014.02.18
Time: 18:02:23

Freeze Frame:
Voltage: 11.80 V
Count: 93

02433 - Supply Voltage for Right Parking Brake Motor (V283)
012 - Electrical Fault in Circuit - MIL ON
Freeze Frame:
Fault Status: 11111100
Fault Priority: 1
Fault Frequency: 15
Reset counter: 188
Mileage: 137816 km
Time Indication: 0
Date: 2014.02.15
Time: 09:58:50

Freeze Frame:
Voltage: 13.04 V
Count: 87



scan 2 after first codes cleared

Friday,14,March,2014,21:59:09:41609
VCDS Version: Release 12.12.2 (x64)

Address 53: Parking Brake Labels: 4E0-910-801.clb
Control Module Part Number: 4E0 910 801 A HW: 4E0 907 801
Component and/or Version: EPB AV1C1010 H01 1010
Software Coding: 0000221
Work Shop Code: WSC 02313 785 00200
VCID: 1D310
1 Fault Found:

02433 - Supply Voltage for Right Parking Brake Motor (V283)
012 - Electrical Fault in Circuit - MIL ON
Freeze Frame:
Fault Status: 11111100
Fault Priority: 1
Fault Frequency: 16
Reset counter: 188
Mileage: 137816 km
Time Indication: 0
Date: 2014.02.15
Time: 09:58:50

Freeze Frame:
Voltage: 13.04 V
Count: 87

[oldgrowler]

I have had this problem and I checked all the electrical plugs and wires around brake callipers and used plenty of water repelling oil spray but it wasn't until I put my battery on charge that it finally released pb, I also had a problem with the boot not closing fully and both of these seem to have disappeared now I have a new battery so worth checking your battery for a possible cell malfunction, it could be a coincidence after changing battery but a cheaper option.

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[a8starr]

I have had this problem and I checked all the electrical plugs and wires around brake callipers and used plenty of water repelling oil spray but it wasn't until I put my battery on charge that it finally released pb, I also had a problem with the boot not closing fully and both of these seem to have disappeared now I have a new battery so worth checking your battery for a possible cell malfunction, it could be a coincidence after changing battery but a cheaper option.

Sent from my Nexus 7 using Tapatalk

Good point! Never thought of this. I had a new battery in 2012 but I don't think it was from Audi.

I currently also have an issue with boot soft close mechanism.

Should I call the AA to come charge my battery?

[oldgrowler]

I couldn't say if putting an after market battery on would make any difference but when you buy one from Audi you get a code to let the battery management know it's got a new battery and start the depletion count down from the top again but if you didn't re-code I wonder if the system could still think the battery is at the end of its life or you may just be unlucky and have a faulty battery. I believe that both pb and boot closure modules are situated below battery too so whether that has any significance in the faults I have no idea but it couldn't hurt to give your battery a day or two on trickle charge to see if it helps. Just can't remember if I had my still charging when I tried to release pb again and I believe it still took a few attempts before it worked again. Hope you have some joy and get it working again.

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[a8starr]

This morning the battery was very low. AA guy could not start the car so attached a charger to the battery. After charging the battery the parking brake disengaged the callipers further than last night but still there were warning lights for the EBP. We were able to move the car by foot when in neutral. Took it for a short spin and there was still some heat coming from disc. The AA guy then jacked up the rear to spin the wheels to check which side is sticking. (I learnt you can spin each wheel separately on a quattro if the car is in neutral with parking brake off.)

So the problem seems to be a sticking driver side rear calliper. The left rear wheel did spin freely so does this indicate the parking brake motor is working but not able to un wind the rear right calliper?

I guess using VCDS to open the callipers won't work if it's seized?

Is there anyway to manually get it moving again?

Found this post http://www.tyresmoke.net/forum/topic/126585-oh-****-d3-parking-brake-stuck-on-any-ideas/

[oldgrowler]

Try spraying oil in all the electrical points and whilst charging battery at home after a full day charge leave charger connected at on charge then keep applying and disengaging the pb several times to see if it clears up, pretty sure mine didn't clear on first try but code battery if poss as this may help.

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[a8starr]

Try spraying oil in all the electrical points and whilst charging battery at home after a full day charge leave charger connected at on charge then keep applying and disengaging the pb several times to see if it clears up, pretty sure mine didn't clear on first try but code battery if poss as this may help.

Sent from my Nexus 7 using Tapatalk



Thanks. I will need to buy a battery charger.

What type of oil and where exactly do you mean on the electric points?

Do you mean disconnect the cables to the pb motor and calliper and spray into the contacts?

[oldgrowler]

I used a spray oil like gt85 but check it repels water and any connections around brakes I unplugged and checked then applied a generous application of oil before plugging together again, like I said I may have been lucky but it does seem to be a low battery power issue in my case and thought I would share just in case it was the same for you. The only difference with my problem to yours is that I put a genuine Audi battery on after reading up about coding.

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[a8starr]

Is it safe just to pull the cables apart?

Ignition on or off? PB released or on?

I believe my battery is coded.

[oldgrowler]

I unplugged mine whilst ignition was off and it doesn't seem to have affected any operation.

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[a8starr]

Taken the wheel off now stuck. I can't see the parking brake cables or cable to the calliper. I guess it is behind the piece that is behind the discs. http://img.tapatalk.com/d/14/03/17/unujyqaq.jpg

Also the hub plate is not centred so how to get the wheel back on?http://img.tapatalk.com/d/14/03/17/9yvy4y7y.jpg

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[oldgrowler]

I accessed the connections from underneath without removing wheels and they are at the rear just follow the wiring, I'm puzzled at how the holes don't align after you removed the wheel but it looks like you will have to lever it around making sure you don't damage thread, from the photo it looks like top hole without a thread has a small hole which you could probably use to lever.

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[a8starr]

What I can't work out if that piece is separate. Yes I see that hole. Will try lever it.

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[a8starr]

OK I did it. Now I can't find anything on the net about where to place Axel stands on an a8. There is not enough space on the jacking points to slot the stand whilst being held up by floor jack.

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[oldgrowler]

I'm not the best person to answer this as I used a large piece of timber and a trolley jack so I wouldn't damage anything but make sure you put something else like a spare wheel under car on case the jack fails.

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[a8starr]

Did the cables just pull apart or is there a clip you have to press. I am struggling to find a position to see them properly.

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[oldgrowler]

They are a bit of a pain and I suggest a torch as you have to press in a section to release but it was quite some time ago when I did mine so can't fully remember the procedure I went through but clean all the connections with a rag so you can check all around them using a torch and I'm sure you will work out how they part.

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[a8starr]

got a battery charger. There is a switch on the charger to specify battery type. Sealed or standard. Which one is it?

[oldgrowler]

You will need to check battery but generally sealed batteries.

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[a8starr]

I ran the battery charger overnight. Battery charged up fine. Still the right rear calliper won't release. It might be due to the wire connection to the right EPB motor. The left EPB motor seems to work.

I got the same fault code I got yesterday

02433 - Supply Voltage for Right Parking Brake Motor (V283)
012 - Electrical Fault in Circuit - MIL ON
Freeze Frame:
Fault Status: 11111100
Fault Priority: 1
Fault Frequency: 16
Reset counter: 188
Mileage: 137816 km
Time Indication: 0

Freeze Frame:
Voltage: 13.04 V
Count: 87

[oldgrowler]

Sorry I can't help you then as that worked for mine but it did take several tries and I might have just got lucky.

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[a8starr]

don't worry. Car is at the garage today to get sorted.