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Brakes problem

6222 Views 17 Replies 11 Participants Last post by Huey52, Jul 18, 2021

Jenya

Discussion Starter · Jul 16, 2021 (Edited)

I was backing out of the parking spot and suddenly all the icons appeared on the steering wheel screen showing malfunctions. I pressed the brake pedal and it didn’t go down. So the car didn’t stop and continued to roll backward. I could make it stop only by pressing the parking mode. Further, the car refused to respond to any commands, all the pedals didn’t work. On the main menu (Vehicle - Information) was displayed 1 message that brake booster is limited. I called VW road assistance, and while I was hanging on the line waiting for an answer (around 5-10 minutes), the car woke up and I was able to drive it. Of course, I will go to the dealer for a service check as soon as possible, but I would like to know your opinion of what it could be. A glitch in the system or a problem with the brakes… The car drives normally now and I don’t see any warning messages.

UPDATE: The car dealer contacted VW and they recommended to replace the brake booster. Also, they escalated details of this problem to the VW upper management.

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igniztion

· #2 · Jul 16, 2021

Sounds like another one of the bugs where a fault code in the system block off the entire usability of the car, then the fault clears itself and car is back to normal. Definitely get it logged so that VW is aware, and hope it gets fixed sooner rather than later.

Reactions: 3

eb2143

· #3 · Jul 16, 2021

Wow this is the scariest software malfunction I've yet seen. Sudden loss of brake booster could have have caused an accident. I'm glad you were going slowly and had the wits about you to use p brake

My old TDI lost brake booster while driving but that was a common issue with cracked vacuum hose. It should still stop if you stomp on it but it will be a very hard pedal....

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Spin

· #4 · Jul 16, 2021

Make sure to start a case with VW Customer Care 1-800-822-8987

Reactions: 4

Dexter

· #5 · Jul 16, 2021

That is really scary. Were you fully charged? I wonder why the regen was not applied when you hit the brake. I would not think the brake booster would affect regen.

Reactions: 1

MCheiron

· #6 · Jul 16, 2021

I wonder if the OP was able to push hard to get some braking force to the wheel? Otherwise, this is a huge safety issue.

Reactions: 3

Jenya

Discussion Starter · #7 · Jul 16, 2021

Dexter said:
That is really scary. Were you fully charged? I wonder why the regen was not applied when you hit the brake. I would not think the brake booster would affect regen.

Car had about 70% of charge and the speed was very low as I just started backing out from the parking spot. As I was told regen doesn’t work at low speed and EVs.

Jenya

Discussion Starter · #8 · Jul 16, 2021

MCheiron said:
I wonder if the OP was able to push hard to get some braking force to the wheel? Otherwise, this is a huge safety issue.

I tried to push hard, but the pedal didn’t go down like there was something inside that didn’t let me do that.

Twylasdad

· #9 · Jul 17, 2021

Jenya said:
I tried to push hard, but the pedal didn’t go down like there was something inside that didn’t let me do that.

Wow. I would certainly hope VW would find this intensely interesting. Thanks and please keep us posted.

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MCheiron

· #10 · Jul 17, 2021

Jenya said:
I tried to push hard, but the pedal didn’t go down like there was something inside that didn’t let me do that.

That must have been scary. Great reaction of putting it in park. I am not sure if I would have thought of that coming from a manual shift car. What did VW say about the incident when you filed this case?

Otto

· #11 · Jul 17, 2021

MCheiron said:
That must have been scary. Great reaction of putting it in park. I am not sure if I would have thought of that coming from a manual shift car. What did VW say about the incident when you filed this case?

Since we're talking about brakes not working I think it's important to take this opportunity to bring to everyone's attention, in case you don't know, how to engage the emergency brake.

According to the manual you press and hold the parking brake button. Here is what the online manual for my U.S. based ID.4 (go check your manual for your car to be sure it's the same), at this moment, says...

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Spin

· #12 · Jul 17, 2021

Otto said:
Since we're talking about brakes not working I think it's important to take this opportunity to bring to everyone's attention, in case you don't know, how to engage the emergency brake.

According to the manual you press and hold the parking brake button. Here is what the online manual for my U.S. based ID.4 (go check your manual for your car to be sure it's the same), at this moment, says...

View attachment 4462

Thank you for this post. I was under the impression that it was a press and release, like when parking. My bad for just assuming!!

Reactions: 2

Jenya

Discussion Starter · #13 · Jul 17, 2021

MCheiron said:
That must have been scary. Great reaction of putting it in park. I am not sure if I would have thought of that coming from a manual shift car. What did VW say about the incident when you filed this case?

It was scary! I called VW customer service, but didn’t get an answer after 15 minutes of waiting. They scheduled a call back on Thursday. And I’m taking a car to the car dealer for service check on Monday.

ARob

· #14 · Jul 17, 2021

GM has had a persistent problem with Bosch iBooster brake modules. Maybe related?

Some owners have replaced theirs a few times, I never had any issues so it must be hit\miss. They report clicking\grinding sounds before it actually fails. If there is no noise, then yah, it sounds like CANBUS and\or MCU confusion with signals.

I saw another post on this forum, having to do with frozen or blank screens. Again, Bolt owners (sorry to keep bringing that up but there may be similarities) see this from time to time. I found giving the car some time to initialize everything before asking it to move eliminates the possibility of a lot of glitches.

As others have said, this is a computer on wheels. Computers often need to run diagnostics and initialize a lot of environmental settings during the boot up process. Auto makers should limit or prevent engaging in driving before everything is up and running smoothly. But, software engineers are notorious for not understanding real world use, and often poo poo the QA folks when they try to anticipate what the unwashed public will do with the machines. Of course, users want to drive their cars like a getaway vehicle.

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adamjcook

· #15 · Jul 17, 2021

Spin said:
Make sure to start a case with VW Customer Care 1-800-822-8987

In addition to contacting VW, also consider filing a vehicle complaint here as this is, as described, clearly a safety issue which may be widespread: Report a Vehicle Safety Problem, Equipment Issue | NHTSA

Stay safe!

Sincerely,

Adam J. Cook

Reactions: 5

Twylasdad

· #16 · Jul 18, 2021

ARob said:
GM has had a persistent problem with Bosch iBooster brake modules. Maybe related?

Some owners have replaced theirs a few times, I never had any issues so it must be hit\miss. They report clicking\grinding sounds before it actually fails. If there is no noise, then yah, it sounds like CANBUS and\or MCU confusion with signals.

I saw another post on this forum, having to do with frozen or blank screens. Again, Bolt owners (sorry to keep bringing that up but there may be similarities) see this from time to time. I found giving the car some time to initialize everything before asking it to move eliminates the possibility of a lot of glitches.

As others have said, this is a computer on wheels. Computers often need to run diagnostics and initialize a lot of environmental settings during the boot up process. Auto makers should limit or prevent engaging in driving before everything is up and running smoothly. But, software engineers are notorious for not understanding real world use, and often poo poo the QA folks when they try to anticipate what the unwashed public will do with the machines. Of course, users want to drive their cars like a getaway vehicle.

What kind of waiting period do you recommend? A few seconds? A minute? How can we tell when the car is ready?

ARob

· #17 · Jul 18, 2021

Twylasdad said:
What kind of waiting period do you recommend? A few seconds? A minute? How can we tell when the car is ready?

Not sure with ID.4, with Bolt I usually start, buckle up and it’s ready. ID.4 probably has its own pace. It seems HVAC takes 30-60 seconds to kick in, maybe that is a good guide?

Sent from my iPhone using Tapatalk

Huey52

· #18 · Jul 18, 2021

I fasten my seatbelt, push the brake pedal, and then I wait until the Infotainment screen fully populates its icons before shifting the 'transmission.'
Of course just sitting down commences the wake-up.

Twylasdad said:
What kind of waiting period do you recommend? A few seconds? A minute? How can we tell when the car is ready?

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