Matt865 Posted August 27, 2024 Share Posted August 27, 2024 Issue with BMW 3 Series Now please bear with me since I am not familiar with the technical aspects of an automobile. I own a 2014 BMW 3 Series diesel car with a manual gearbox, and it has lately been experiencing issues. The issue initially arose during gear shifting, particularly when transitioning from 3rd to 4th gear. It gave the sensation of unintentionally engaging the brakes, although this occurred only on a few occasions. Subsequently, while driving on the motorway, the vehicle abruptly decelerated from 90mph to 40mph, resembling the effect of an emergency brake or engine braking at excessively high revolutions per minute. Currently, the issue persists consistently anytime I exceed a speed of 40mph, to the extent that it gives the sensation of being on the verge of losing control. The manual gearbox has not been shifted or impacted, and there are no fault messages or dashboard lights after connecting the computer. Has anybody encountered this phenomenon or had any insights on its nature? Quote Link to comment Share on other sites More sharing options...
IrvesBMW Posted August 27, 2024 Share Posted August 27, 2024 Did precipitation occur when the windscreen wipers were in operation, by any chance? Quote Link to comment Share on other sites More sharing options...
Matt865 Posted August 27, 2024 Author Share Posted August 27, 2024 While I cannot be completely positive, there is indeed a possibility. What would be the significance of that? Quote Link to comment Share on other sites More sharing options...
IrvesBMW Posted August 27, 2024 Share Posted August 27, 2024 The Dynamic Stability Control (DSC) module has a brake drying function that is designed to deliver a minimal amount of braking force in order to remove moisture from the brake discs. There have been documented problems with the module excessively applying braking pressure. To conduct a test, drive the automobile and observe whether the issue occurs when the windscreen wipers are activated. Quote Link to comment Share on other sites More sharing options...
Matt865 Posted August 27, 2024 Author Share Posted August 27, 2024 Thank you, I will attempt that and then provide you with an update. Quote Link to comment Share on other sites More sharing options...
Matt865 Posted August 27, 2024 Author Share Posted August 27, 2024 That does not seem to be the underlying reason. Thank you, however. Are there any further concepts or notions? Quote Link to comment Share on other sites More sharing options...
Motoman Posted August 27, 2024 Share Posted August 27, 2024 Although not identical, I have seen on my previous 2011 320D that sometimes the DSC (skiddy car symbol) would intermittently flash and momentarily engage the brakes when driving on the freeway. However, the speed drop was not as severe as you have described, and it is likely that a warning message would appear as well. I believe the issue was related to a malfunctioning wheel speed sensor. Quote Link to comment Share on other sites More sharing options...
Matt865 Posted August 27, 2024 Author Share Posted August 27, 2024 Does anybody have any ideas? Quote Link to comment Share on other sites More sharing options...
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