Parking Brake unexpected Release (MT)

[cbring]

..... is anyone else experiencing the issue OP is experiencing?

Sponsored

 

[Spart]

The whole situation is weird.
Sometimes it would turn off when i press in the clutch
Sometimes it would turn off when I let go of the clutch, while still in neutral
Sometimes it would not turn off as many times I press in the clutch in and out, until I go first gear and accelerate (My understanding this should be default); correct me if i'm wrong.

I believe that it can be replicated 100% of the time if you do the following, in order:

• Engine running, transmission in neutral.
• Set parking brake.
• Hold clutch pedal in.
• Touch brake pedal and release.
• Touch throttle pedal and release.
• Wait ten seconds or so.
• Release clutch pedal.

Why in this order? I believe that this system is armed as soon as the parking brake is applied, and at that point it starts tracking whether the brake and gas have been recently applied. "Recent" is overly liberal though, and this interlock should really be looking at simultaneous clutch release and throttle applied IMO. In addition to an interlock that defeats the system if the car is in neutral.

 

[barasoap]

I have also had this problem but only when I've stopped the car temporarily. I think I stopped the car to talk to friends and then started rolling backwards so what you're saying about the timer makes a lot of sense. At least I've never had it roll away while it was off. Always leave it in 1st/Reverse. Definitely has to be fixed and new owners should be informed.

 

[Spart]

Always leave it in 1st/Reverse.

Be careful admitting that around here, or @lmfao will be along shortly to tell you about how you're parking wrong.

I have also had this problem but only when I've stopped the car temporarily. I think I stopped the car to talk to friends and then started rolling backwards so what you're saying about the timer makes a lot of sense.

Give it a shot with the last bulleted list I posted and see if you can't replicate it 100% of the time.

 

[bushido]

i'm asking a question:
so to put it in tl;dr terms, the MT has a manual transmission with the parking brake behavior of an AT? wat

 

[Spart]

i'm asking a question:
so to put it in tl;dr terms, the MT has a manual transmission with the parking brake behavior of an AT? wat

This is my first manual car with an electronic parking brake. I'm not sure how prevalent this is with the MT+electronic parking brake combo, but this car (and you might assume modern BMW MT cars also) has a "feature" where if you attempt to drive away with the parking brake engaged, it releases automatically.

The feature does not seem to have enough safety interlocks on it though, resulting in unexpected behavior.

 

[bushido]

This is my first manual car with an electronic parking brake. I'm not sure how prevalent this is with the MT+electronic parking brake combo, but this car (and you might assume modern BMW MT cars also) has a "feature" where if you attempt to drive away with the parking brake engaged, it releases automatically.

The feature does not seem to have enough safety interlocks on it though, resulting in unexpected behavior.

i can confirm this is NOT the case with the 10th gen Civic Si, Accord 2.0T, or 6th gen Camaro SS/ZL1, C7 Corvette

 

[Spart]

i can confirm this is NOT the case with the 10th gen Civic Si, Accord 2.0T, or 6th gen Camaro SS/ZL1, C7 Corvette

I've driven the 6G Camaro and C7 Corvette, and I also did not notice this type of behavior.

 

[CULaterJimzo]

I believe that it can be replicated 100% of the time if you do the following, in order:

• Engine running, transmission in neutral.
• Set parking brake.
• Hold clutch pedal in.
• Touch brake pedal and release.
• Touch throttle pedal and release.
• Wait ten seconds or so.
• Release clutch pedal.

I'll give that a try after work tonight. Idk if you guys remember when you got your cars, I for sure remember that I could never turn off the PB until I press the clutch and HAVE to push the PB button; as it will indicate you on your dash OR gear in and gas otherwise there was no other way if i remember correctly. (This would be my first week owning the car and getting used to the new modern day system, adjusting seat, getting used to the feel of the clutch when it was on and im sure it never turned off).

I have also had this problem but only when I've stopped the car temporarily. I think I stopped the car to talk to friends and then started rolling backwards so what you're saying about the timer makes a lot of sense

This did happen to me couple days ago too, stopped, press PB, foot off brake and while talking i randomly clutch in wobble the stick side to side and noticed it turned off. Definitely hazardous if not paying attention

 

[6mtsoup]

Really have no idea what kinda footsies you guys are playing with the pedals, tried almost every combination of clutch, break, gas, wiggle/move shifter, waiting in between/after. My PB never disabled when in neutral.

 

[6SPDA91]

Haha yea, In that video I did had my foot on the brake. But most of the time I'd just one leg clutch in and start the car to get it warm before I leave for work. Even like that the PB would sometimes turn off on its own and sometimes it wouldn't.


Ever since I own this modern MT car, I try to discipline myself to triple check if the PB is on since I'm used to pulling the level on older cars. In the video you can see that the light was on just before I let my foot off.

The whole situation is weird.
Sometimes it would turn off when i press in the clutch
Sometimes it would turn off when I let go of the clutch, while still in neutral
Sometimes it would not turn off as many times I press in the clutch in and out, until I go first gear and accelerate (My understanding this should be default); correct me if i'm wrong.

I don't want to speculate on the auto release because I don't know definitively.

If you haven't taken it to the dealer for this issue, I would recommend doing that sooner than later. While you wait for that appointment, make note of the parking brake when you turn the car off and then when you get into it next. Basically you'll want to build a dataset and provide tangible evidence that there is a problem.

That's just my thought. Please be safe

 

[BMWAF]

I said I wasn't going to comment. But I think I will because.. safety.

I went for a test drive in an MT today and I attempted to get the parking brake to fail. After I switched off the engine and applied the park brake I mashed the pedals, put it in gear, engaged the clutch, etc. Park brake didn't flinch.

Might be some cars are Friday built?

 

[6SPDA91]

This is my first manual car with an electronic parking brake. I'm not sure how prevalent this is with the MT+electronic parking brake combo, but this car (and you might assume modern BMW MT cars also) has a "feature" where if you attempt to drive away with the parking brake engaged, it releases automatically.

The feature does not seem to have enough safety interlocks on it though, resulting in unexpected behavior.

My audi has MT electronic parking brake and can auto release if I go into gear and start driving. 1st but not reverse and only sometimes. There's definitely conditions built in to avoid accidental movement

 

[Adrenaldestruction]

To add to this:

We experience the same issue. Semantics aside - the brake will release based on some algorithm in the vehicle software - essentially: hitting a pedal while the brake is engaged and vehicle is running.

I see many are saying, “have better habits!” and “just do things in this order every time!” and “always park and turn off and set!” I envy the simplicity in your life if you’re not familiar with being rushed, distracted or otherwise absentminded. I also envy your ability to fit into the Supra without a second thought. Whether someone is rushed, clumsy, or has big feet, there are innumerable ways you can “accidentally” trigger this event. It’s annoying - and while it’d be nice if we all had a pre-flight checklist and no-go protocols… we do not.
It is a bad design. And it is not the only one. Recognizing a flaw isn’t demonizing a platform - and Toyota continues to prove, at the dealer level and at the corporate level, that their inclination toward fixing such issues is …absent.

 

[Awales74]

switched off the engine and applied the park brake ... Park brake didn't flinch.

All the reported cases are with the car on; such as leaving the car running to defrost.

Sponsored