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Parking brake not engaging

Tiny
RAJDEEP
  • MEMBER
  • 2005 BMW 745
  • V8
  • 2WD
  • AUTOMATIC
  • 155,000 MILES
Hi, I have the car listed above LI. The parking brake works some times and most of the time it does not. When it engages, it works absolutely fine. I have already replaced the plastic actuator with a metal actuator which is responsible to tighten or loosen the parking brake cable.

Please advise.

Thanks
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Monday, December 14th, 2020 AT 9:30 AM

5 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
When this does not work, is there any indicator that it is not working? Meaning is there a message that says there is an issue or the light not come on? Or does everything operate normally but the brake just doesn't engage? In other words, how do you know it is not working?

Here is the process from the manual on how this works and how to do the initialization process. Let's try that and see if it makes an improvement. Basically just press the parking brake button 4 times with the ignition in the on position but the engine off.

Let me know what about this info and we can go from there. Thanks
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Tuesday, December 15th, 2020 AT 3:40 PM
Tiny
RAJDEEP
  • MEMBER
  • 20 POSTS
When the parking brake does not work, the PDC malfunction light comes up and when on a slope the car rolls forward (slightly) when ignition is off. But when the parking brake engages, the car holds like a rock on the slope and no parking brake malfunction indicator. Also when the parking brake is turned off, I can hear the actuator release the brakes. I had opened up the parking brake unit in the car trunk and replaced the plastic actuator with metal one. Also applied some lube.
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Wednesday, December 16th, 2020 AT 6:51 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Okay. If that message comes up then we should have some codes. This is most likely a sensor issue but we need to find out what code is there and then we can determine next steps.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Just make sure the scan tool can communicate with the PDC (most can) and you will be able to pull the codes.
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Thursday, December 17th, 2020 AT 5:01 PM
Tiny
RAJDEEP
  • MEMBER
  • 20 POSTS
The error code says "00507C, Parking gear Incorrectly Engaged". What baffles me is that it does work sometimes, but not always.
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Friday, January 8th, 2021 AT 10:26 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This could be a couple things but I would start with checking the fluid condition and level. I attached the process below on how to check the fluid level but if this park lock is not engaging then it may be this simple which would explain why it works at times.
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Saturday, January 9th, 2021 AT 4:02 PM

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