Regeneration brake light operation.

[RadfordJim]

To see when the brake lights operate under regeneration, I unclipped the high level brake light so I could watch it in the mirror whilst driving.
At Level 1 with gentle deceleration, it hardly comes on. Level 2 only when you suddenly decelerate and Level 3 more often as you would expect.
I also notice when I use the brake pedal to stop at traffic lights, the hill start/handbrake engages when I've stopped, so I can release the brake pedal, but the brake lights stay on, even though my foot is off the brake pedal. It goes off when I touch the accelerator to move on.

 

[MG Clive]

Thanks @RadfordJim, a useful experiment.

 

[Hybrid Ann]

Thank you for that. Most interesting to know for sure. I knew it did at times because I saw there reflection in the car behind.

 

[ozzz]

To see when the brake lights operate under regeneration, I unclipped the high level brake light so I could watch it in the mirror whilst driving.
At Level 1 with gentle deceleration, it hardly comes on. Level 2 only when you suddenly decelerate and Level 3 more often as you would expect.
I also notice when I use the brake pedal to stop at traffic lights, the hill start/handbrake engages when I've stopped, so I can release the brake pedal, but the brake lights stay on, even though my foot is off the brake pedal. It goes off when I touch the accelerator to move on.

That’s answered a question that’s bugging me awesome thanks looks like a nice dark beer .

 

[RadfordJim]

That’s answered a question that’s bugging me awesome thanks looks like a nice dark beer .

Yes, the beer is Tom Long, taken at Stroud Brewery. I visit frequently when staying with my Daughter

 

[ozzz]

Yes, the beer is Tom Long, taken at Stroud Brewery. I visit frequently when staying with my Daughter

Lovely,we brew beer in Australia we had a dark lager and at the moment ageing a stout it’s 6 months in the bourbon barrel so far.
My sons own Bass point brewery in Shellharbour NSW and retired me do deliveries lol .

 

[Aitch1]

To see when the brake lights operate under regeneration, I unclipped the high level brake light so I could watch it in the mirror whilst driving.
At Level 1 with gentle deceleration, it hardly comes on. Level 2 only when you suddenly decelerate and Level 3 more often as you would expect.
I also notice when I use the brake pedal to stop at traffic lights, the hill start/handbrake engages when I've stopped, so I can release the brake pedal, but the brake lights stay on, even though my foot is off the brake pedal. It goes off when I touch the accelerator to move on.

Thanks for that, I've wanted to know since I got the car.

 

[Anon70]

You might fnd this thread informative as well

Post in thread 'Does high regen turn the brake light on?'

Apr 28, 2024

Not sure if cars made for the UK market have to follow these regs but this might be the tech spec for when a brake light signal must be generated

Sourced from here

https://unece.org/fileadmin/DAM/trans/main/wp29/wp29regs/R13hr2e.pdf

• Anon70

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[Aitch1]

You might fnd this thread informative as well

Post in thread 'Does high regen turn the brake light on?'

Apr 28, 2024

Not sure if cars made for the UK market have to follow these regs but this might be the tech spec for when a brake light signal must be generated

Sourced from here

https://unece.org/fileadmin/DAM/trans/main/wp29/wp29regs/R13hr2e.pdf

• Anon70

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• 

I wonder what that means with our 3 driving modes?

 

[decrep]

I wonder what that means with our 3 driving modes?

In the quoted thread, siteguru says this.

"Agreed. And 1.3 m/s² equates to roughly -7% regen in the MG4.

Therefore regen level 1 probably won't cause the brake lights to activate, but levels 2, 3 and Adaptive will."

 

[mgpooter]

Well done Jim, this brake light thing has been bugging me for over a year now - sorted.
SO... can you let us know, if once we have stopped, will using the "handbrake" switch turn off the brake lights? I hate siting behind illuminated brake lights at traffic lights and like to know mine are off for the guy behind.

 

[RadfordJim]

Well done Jim, this brake light thing has been bugging me for over a year now - sorted.
SO... can you let us know, if once we have stopped, will using the "handbrake" switch turn off the brake lights? I hate siting behind illuminated brake lights at traffic lights and like to know mine are off for the guy behind.

Yes, once you've stopped and applied the P brake, the brake light goes out as soon as you take your foot off the brake pedal. If you keep your foot on the pedal, it remains on, just like a conventional car

 

[Hybrid Ann]

You don't use the P brake during normal driving, The vehicle has Autohold.

 

[decrep]

I must admit I don't understand this thing about being annoyed by brake lights in front of you.
I suppose after 63 years of it being normal for the car in front at lights to have their brakes on, It;s what I expect to happen.
When there are big vehicles in front and the traffic lights are obscured, brake lights going off, are a good indication of when to get ready to start going yourself.

It can't be a brighter light level here, making it less of a nuisance, because even at night I don't find it a problem.
It doesn't seem likely that our brake lights are dimmer than anywhere else either??
This is a puzzle, can anybody enlighten?

 

[RadfordJim]

You don't use the P brake during normal driving, The vehicle has Autohold.

And it's a great feature! To clarify, the brake lights remain on when Autohold is engaged.