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  #1  
Old 04-19-2019, 04:05 AM
Jmdiag2010 Jmdiag2010 is offline
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Faulty handbrake/park position?

Hi All, I know this will sound particularly odd but I've just experienced a fault which has left me very confused. We have a 2009 f07 530d auto. The car gets parked on our sloped driveway day after day. We came out to the car today as usual, pressed the unlock button on the fob and then the car rolled forward crashing into our garage. I cant work out if the handbrake let go and overcame the park position or if both let go but I can be certain both were on prior to leaving the car. No faults stored in the dde, transmision control or the handbrake control unit. Any ideas would be very much appreciated.

Thanks all
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  #2  
Old 04-19-2019, 04:29 AM
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Doug Huffman Doug Huffman is offline
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Quote:
Originally Posted by Jmdiag2010 View Post
the handbrake let go and overcame the park
Usually these are two separate functions. 'P' park on the shifter engages a finger that sticks into the gears of the transmission. 'H' handbrake is a separate mechanical brake device that engages some of the driving wheels.

Each / both probably require a separate electrical motor action to disengage.

How are you certain that both were engaged "on" prior to leaving the car?

On a steep hill, I occasionally engage both, but to be sure, I use a peculiar sequence. Bring the vehicle to a stop on the sloped surface with the service brake. Select 'N' neutral. Engage the 'H' handbrake (often called EMF in BMW). Cautiously release the service brake to see that the EMF is holding (notoriously fragile little bugger). Then select 'P' park and off the engine.

As I said EMF is fragile to wear and long use for its nylon gear wheel. 'P' park pawl is a feature of a $10K component that I try to be very gentle.

https://www.newtis.info/tisv2/a/en/f...-brake/X8bOJAK

https://www.newtis.info/tisv2/a/en/f...g-lock/XH1s3rq

https://www.newtis.info/tisv2/a/en/f.../search?q=park
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Last edited by Doug Huffman; 04-19-2019 at 04:34 AM.
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Old 04-19-2019, 06:26 AM
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frogy frogy is offline
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Thanks for the attachments. Now I will never use the stop and go brake feature. But I will use the P Brake more often to exercise the cables.
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  #4  
Old 04-19-2019, 07:14 AM
Jmdiag2010 Jmdiag2010 is offline
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Thanks for that info, interesting to note the gearbox park function is automatically engaged with the ignition removed (or off presumably in keyless models) and that it should never be disengaged without the engine running. I am certain both the handbrake and gearbox park were engaged last night when I returned home. I usually apply the P position first and then the handbrake gets applied however after reading this I'll be following your recommendation from now. I think this might be worth chasing up with BMW as this also crushed my 3 year old niece and the gearbox alone should be able to hold the weight of the car
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Old 04-19-2019, 07:48 AM
Jmdiag2010 Jmdiag2010 is offline
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Typo**** did not crush my niece! I meant this could have as she was walking in front of it before it started rolling
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Old 04-22-2019, 06:14 AM
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frogy frogy is offline
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Thank you for correction...tears started welling in my eyes!!!!!
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Old 07-27-2019, 11:46 AM
TonyW1967 TonyW1967 is offline
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Over the past year, this has happened to me on numerous occasions (10+), but I've always had both P and H engaged. The pawl always catches it but it lurches forward a few centimetres....
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Old 07-27-2019, 01:52 PM
Jmdiag2010 Jmdiag2010 is offline
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If I'm understanding what your saying correctly then I think this is normal operation. You'll select park on the gearbox and apply the handbrake while the engine is running, then remove foot from brake and once the engine is switched off the car seems to almost fall into the handbrake or park position? This is because the initial setting of the handbrake is done via hydraulics, it applys pressure to the rear brake pads and holds it on the pads, then the handbrake cable is tightened and applys the handbrake shoes from within the rear discs. Once the engine is switched of the pressure from the hydraulics is released and the handbrake shoes take over which is the sensation of the car rolling slightly, it kinda rolls into the shoes to hold the car
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Old 08-02-2019, 02:49 PM
TonyW1967 TonyW1967 is offline
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I think he's talking about more than a couple of inches? It's normal for the car to move an inch or so, but if it moves forwards to the point where the pawl has to engage, then it means the main hydraulic brake has disengaged.... happened to me a few times. Hopefully the pawl will last! :-)
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Old 08-13-2019, 05:41 PM
Semi-Retired Semi-Retired is offline
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It's entirely possible that the parking pawl has broken. Used to happen a lot back in the day to people who never used the parking brakes when parking on slopes, or who were not fully stopped before engaging park. I'm still trying to wrap my head around how the fob releases the brake at all. On the fob for my '14 GT there is no such button. To release it you must enter and start the car with your foot on the brake and then hit the release button on the center console.

Last edited by Semi-Retired; 08-13-2019 at 05:45 PM.
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