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2010 2011 BMW 5 Series Forum F10 BMW 5-Series (F10) Forums General 5-Series Sedan and Wagon (F10 / F11) Forum Parking Brake Failure
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      01-26-2023, 06:42 PM   #1
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Parking Brake Failure

Hello all,

It’s great to be here and a proud member of this innovative community.

Im new here and just signed up as I want to seek some guidance on a parking brake failure on my F10 2013 which only appears in cold or wet weather. Throughout the summer it’s perfectly fine. The brake functions it’s just the warning light that keeps triggering.

I think I’ve found the problem so I am after the spec or BMW part number of the o ring on brake caliper housing (photo attached), which acts as a sealant to prevent moisture from entering the internals of the actuator.

Any help much appreciated.

Many thanks

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      01-27-2023, 09:01 AM   #2
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Welcome to the forum. Unfortunately you never stated if it was front or rear.

Here's a link to one of the online part database sites. You can enter the last 7 digits of your VIN...or select the correct tabs...then go to the brake diagrams. From there you should be able to find the part nbr in the index below the diagrams. Once you have the 11 digit BMW part nbr...you can them easily shop using the part nbr (type "BMW xx xx x xxx xxx" {where x=the actual part nbrs} into a google search).

www.bimmercat.com

Example: front brakes


Example: rear brakes
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      01-27-2023, 09:58 AM   #3
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Quote:
Originally Posted by Qsilver7 View Post
Welcome to the forum. Unfortunately you never stated if it was front or rear.

Here's a link to one of the online part database sites. You can enter the last 7 digits of your VIN...or select the correct tabs...then go to the brake diagrams. From there you should be able to find the part nbr in the index below the diagrams. Once you have the 11 digit BMW part nbr...you can them easily shop using the part nbr (type "BMW xx xx x xxx xxx" {where x=the actual part nbrs} into a google search).

www.bimmercat.com

Example: front brakes


Example: rear brakes
Parking brake is the rear only, no?
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      01-27-2023, 01:09 PM   #4
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Quote:
Originally Posted by Unspec View Post
Parking brake is the rear only, no?
I’ve never seen or heard of it on the front, believe it’s only rear.

And I would imagine there is a brake caliper rebuild kit that would include that oring if it’s not available seperately.
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      01-27-2023, 01:18 PM   #5
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Quote:
Originally Posted by Qsilver7 View Post
Welcome to the forum. Unfortunately you never stated if it was front or rear.

Here's a link to one of the online part database sites. You can enter the last 7 digits of your VIN...or select the correct tabs...then go to the brake diagrams. From there you should be able to find the part nbr in the index below the diagrams. Once you have the 11 digit BMW part nbr...you can them easily shop using the part nbr (type "BMW xx xx x xxx xxx" {where x=the actual part nbrs} into a google search).

www.bimmercat.com

Example: front brakes


Example: rear brakes
Thanks so much — it’s on the rear.
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      01-27-2023, 01:19 PM   #6
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Quote:
Originally Posted by Unspec View Post
Parking brake is the rear only, no?
It’s definitely the rear.
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      01-27-2023, 01:30 PM   #7
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Quote:
Originally Posted by SWFLf10 View Post
I’ve never seen or heard of it on the front, believe it’s only rear.

And I would imagine there is a brake caliper rebuild kit that would include that oring if it’s not available seperately.
Thanks so much. Can you recommend one that I can use as BMW sadly don’t supply one. Much appreciated.
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      01-27-2023, 01:49 PM   #8
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Unfortunately all I’m seeing is the whole caliper or the seal for the piston, which seems to look a bit different. This is the part number I’m finding. 34206786064

Another option would be to go to a local industrial supplier like Grainger or Fastenal and see if they can measure the oring and match it. An issue here is not knowing exactly the makeup of the rubber material. It can swell or be damaged if you use the wrong rubber incompatible fluid. In industrial applications where I work, Viton is usually specified because it’s more resistant to various additives in hydraulic systems.
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      01-27-2023, 10:38 PM   #9
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Quote:
Originally Posted by Unspec View Post
Parking brake is the rear only, no?
Quote:
Originally Posted by SWFLf10 View Post
I’ve never seen or heard of it on the front, believe it’s only rear.
HA! You guys are absolutely correct…I read right past “parking brake”. I even reread the original post several times to see if I missed front or rear. I guess “parking” didn’t register in my brain.
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      01-28-2023, 03:02 PM   #10
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Rockauto has the rebuild kits

Just seals:

https://www.rockauto.com/en/moreinfo.php?pk=13370113

https://www.rockauto.com/en/moreinfo.php?pk=3766350

https://www.rockauto.com/en/moreinfo.php?pk=5632164

https://www.rockauto.com/en/moreinfo.php?pk=3059688

Entire rebuild kit:

https://www.rockauto.com/en/moreinfo.php?pk=13650357

Ebay option:

https://www.ebay.com/itm/134326077709

https://www.ebay.com/itm/115578417099

UK option (from Burnley):

https://www.ebay.com/itm/334325613583

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Hope these options were helpful
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      01-28-2023, 05:32 PM   #11
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Superb. Thanks so much. Hopefully this will fix the issue of my parking brake failure which is driving me nuts. I’ll keep you posted.
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      01-29-2023, 07:22 AM   #12
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One more question where is the sensor located in the EMF that triggers the parking light failure when there’s moisture in the unit ?
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      01-29-2023, 10:52 AM   #13
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Quote:
Originally Posted by Casa View Post
One more question where is the sensor located in the EMF that triggers the parking light failure when there’s moisture in the unit ?
There isn't one. Your motor is likely just going bad
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      01-29-2023, 11:38 AM   #14
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Quote:
Originally Posted by Unspec View Post
There isn't one. Your motor is likely just going bad
Just a silly question from my side — how does it know it’s going bad and pop the failure and auto hand brake light on dash?

Thanks so much
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      01-30-2023, 07:57 AM   #15
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Quote:
Originally Posted by Casa View Post
Just a silly question from my side — how does it know it’s going bad and pop the failure and auto hand brake light on dash?

Thanks so much
Just guessing here, but the computer could sense the motor is drawing more current that it is supposed to because it’s getting stuck and then throws the error?
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      01-30-2023, 12:36 PM   #16
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Quote:
Originally Posted by SWFLf10 View Post
Just guessing here, but the computer could sense the motor is drawing more current that it is supposed to because it’s getting stuck and then throws the error?
You’ve been ever so helpful — thank you. One more. Is is normal to get the Autohold error and parking light failure together as a fault.
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      01-30-2023, 01:06 PM   #17
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Quote:
Originally Posted by Casa View Post
You’ve been ever so helpful — thank you. One more. Is is normal to get the Autohold error and parking light failure together as a fault.
Yep the autohold uses the EMF to hold the car.
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      01-31-2023, 06:50 AM   #18
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Quote:
Originally Posted by bk_mike View Post
Yep the autohold uses the EMF to hold the car.
Autohold uses the service brakes, (the hydraulic system). Not the electric parking brake.
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      01-31-2023, 11:59 AM   #19
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Quote:
Originally Posted by HighlandPete View Post
Autohold uses the service brakes, (the hydraulic system). Not the electric parking brake.
This is correct. From newTIS:

Quote:
The automatic hold function is activated using a button behind the parking brake button. The button is connected to the Dynamic Stability Control (DSC). When the function is selected, the vehicle is hydraulically braked from the first application of the brake by the DSC until it comes to a complete halt. When the engine is switched off, the parking brake assumes the holding function.
Which is why autohold and parking brake are interlinked and both are disabled if there is a parking brake failure: it cannot do the last sentence of "parking brake assumes the holding function" if the parking brake is malfunctioning, leading to a risk of a vehicle rolling away when drivers expected it to be held.
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      01-31-2023, 02:53 PM   #20
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Quote:
Originally Posted by Unspec View Post
Which is why autohold and parking brake are interlinked and both are disabled if there is a parking brake failure: it cannot do the last sentence of "parking brake assumes the holding function" if the parking brake is malfunctioning, leading to a risk of a vehicle rolling away when drivers expected it to be held.
Yes, I understand that the two are linked for sequential function.

My understanding, the OP's EMF is working, even though getting a warning. Interesting to know if Autohold is also working and the EMF takes over when switching off.

If so, I'm also minded the EMF may be drawing more current when damp, triggering the warning.
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      02-19-2023, 01:55 AM   #21
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All

Problem has now been resolved. It was water ingress in the base of the boot (trunk) and this was getting to the connector of the EMF module. We cleaned it out and let it dry and now hey presto it’s all good.

The actuator resistance was 1ohm on the cables so new it wasn’t the EMF actuators.

I have videos if anyone is interested in the process if you ever get this problem.

Thank you all so much for your valuable feedback and patience in answering my questions.

Have a lovely weekend all.

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      03-11-2023, 09:01 PM   #22
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Quote:
Originally Posted by Casa View Post
All

Problem has now been resolved. It was water ingress in the base of the boot (trunk) and this was getting to the connector of the EMF module. We cleaned it out and let it dry and now hey presto it’s all good.

The actuator resistance was 1ohm on the cables so new it wasn’t the EMF actuators.

I have videos if anyone is interested in the process if you ever get this problem.

Thank you all so much for your valuable feedback and patience in answering my questions.

Have a lovely weekend all.

Casa
hey man please can i have your contact can you help me with this is driving me crazy can you please help me with a video or guidance i have exact same problem and spend quite some money untill now to fix this... failed so far
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