14 hours ago, Gabbo said:

 

There are obviously exceptions e.g. Where you stop unexpectedly on a fast road but then here you keep you foot on the pedal & the brake lights are illuminated as normal.

I think you have answered your own question. The manufacturer considers the drivers to be stupid, and this in the main is not an unreasonable position. Therefore the manufacture couldn’t possibly justify relying on the driver to keep their foot on the brake pedal “when stopping unexpectedly on a fast road”.

On 30/11/2023 at 22:24, Paws4Thot said:

How do you argue that brake lights that go out when you take your foot off the pedal are "defective"?

 

Because coding is not the orginal one, I guess...

Additionally, some people think they can play being wizzards wich VCDS or ODBeleven, but they do make a mess... They probably don't only deactivate the brake light with autohold...  

 

A bit like Mickey Mouse playing sorcerer's apprentice and try to have the house get cleaned by brooms and buckets. But in the end, he only makes a huge mess... 😱😄

 

On 30/11/2023 at 22:46, Stonekeeper said:

Brake lights should come on when you are Braking/slowing down they should not need to be on when you have stopped.

 

Anyone who runs into the back of an already stationary vehicle isn't paying attention.

It sounds a bit abrupt.

You may be right for most of the trafic conditions, but I can't help thinking that in some severe weather conditions (heavy rain, thick fog, night, or even all at the same time... ) , it's safer for me and my passengers if these brake like keeps being on once stopped.

1 minute ago, Bap33 said:

Additionally, some people think they can play being wizzards wich VCDS or ODBeleven, but they do make a mess... They probably don't only deactivate the brake light with autohold...

OK, so why don't brake lights stay on when you use the handbrake? By the logic you seem to be applying this should happen.

Don't mix everything. Handbrake uses electric motors on the rear pads only and there's no switch connected to the brake light on this system.

We were talking on the main hydraulic brake system with brake pedal, which has a switch behind the brake pedal.

 

 

@Gabbo you do not have DRL,s to the rear unless you have activated then or are in a country where mandatory and the car came from the factory with them enabled. You have tail lights (position lights on with Sidelights or side and headlights. ). Maybe not on if you have Auto set and the car does not decide to put them on.

 

10 hours ago, Bap33 said:

.

We were talking on the main hydraulic brake system with brake pedal, which has a switch behind the brake pedal.

 

 

I think the switch is somewhere else in the system. Maybe on the master/slave section or even pressure activated. If it were on the pedal it would be easy to change the coding.

33 minutes ago, MarkyG82 said:

I think the switch is somewhere else in the system. Maybe on the master/slave section or even pressure activated. If it were on the pedal it would be easy to change the coding.

 

It's a good thing to hypothesize, when you're not sure...

 

But sorry to ruin your assumption. Brake switch is reference 1K0945459A and IS located onto the brake pedal. Just have a look to any online ETKA.

Regarding the coding modification, it does not depend on the sensor / switch location, but on the way it has been integrated in the system and coded, and... the tool you use to change the code (e.g. VCP may be required when VCDS cannot do it).

When you change a coding, it's the SW in a control unit that you modify. Thus, nothing to do with sensor or switch location.

 

 

7 minutes ago, Bap33 said:

1K0945459A and IS located onto the brake pedal

Are you sure? Look at google image results for that PN.

Yes I am. I've been looking the reference from ifinterface.com just before replying.

Additionally, I've just checked on auto-doc.fr. This reference actually corresponds to a brake switch.

 

Don't trust the pictures that Google shows on the 1st page, it shows up things that can roughly deal with your search... It's not always a list of exact matching references.   

 

I think you may want to trust what's visible on a car, over what's on a database; but up to you. 

So if the switch was fitted to the pedal box how do the lights stay on when the pedal is released? I'm not trying to be difficult, just want to understand what we are dealing with.

2 minutes ago, MarkyG82 said:

So if the switch was fitted to the pedal box how do the lights stay on when the pedal is released? I'm not trying to be difficult, just want to understand what we are dealing with.

Just a control logic.

When brake pedal is released but speed is still zero, then brale lights are kept on.

They get off, once gasp pedal is pressed.

It could be something like that. But, other ways to code it are probably possible.

 

Just did a little research and it seems that modern systems have canbus controlled brake lights. That really surprises me with my limited knowledge of canbus and how they can fail. Or maybe it's so they can design in redundancy.

10 hours ago, Breezy_Pete said:

I think you may want to trust what's visible on a car, over what's on a database; but up to you. 

ifinterface is an online free copy of official ETKA.

Any error is still possible, but it never happened to me though I've been using it over 19 years, now. 🤞

9 hours ago, Bap33 said:

ifinterface is an online free copy of official ETKA.

Any error is still possible, but it never happened to me though I've been using it over 19 years, now. 🤞

The drawing is wrong in this case, out of date compared to what's written.

 

For a 2017 Superb, this is another 'wild' ETKA page showing brake light switch of the part number you mention. LLLParts

See where it says ".. associated part 611-000,7 ..."?

That page is the brake master cylinder, where you can see it mounted on the side, item 7: LLLParts

See how the representation of this "brake light sensor" looks just like the parts shown in google image results of the part number (and quite unlike the image of the pedal version in the other ETKA page)?

 

Look on your car in the two places, photograph what you see.

Edited 3 December, 20232 yr by Breezy_Pete

I've tried the auto hold finally today now that my winter wheels are mounted & I have to agree that it works very well & another thing better than the Mercedes. 🙃

 

I can also confirm that it uses the braking system (not the e-hand brake) & the brake lights stay illuminated.

 

I will use it like this for now & use the hand brake to deactivate the brake lights when I'm waiting longer in traffic lights or queuing traffic

9 hours ago, Gabbo said:

I will use it like this for now & use the hand brake to deactivate the brake lights when I'm waiting longer in traffic lights or queuing traffic

I only do this at drive thrus...