Merged thread: Automatic Emergency Braking activating for no reason

[Martinonline]

I have set FCA sensitivity to Medium and not had a problem with braking. I do get a warning when driving down a road with cars alternately parked each side (eg a chicane?) if the car thinks I'm going too fast. Otherwise emergency braking only occurs when I use ACC in limited speed zone with parked cars.

 

[NLMGSAN]

I do get a warning when driving done a road with cars alternately parked each side (eg a chicane?) if the car thinks I'm going to fast.

You mean the gong sound?
Mine comes up on each trip after about 10 miles, even if there is nobody around. Like saying "he, don't forget me.. "

 

[Rolfe]

I have set FCA sensitivity to Medium and not had a problem with braking. I do get a warning when driving done a road with cars alternately parked each side (eg a chicane?) if the car thinks I'm going too fast. Otherwise emergency braking only occurs when I use ACC in limited speed zone with parked cars.

What you describe is phantom braking, not emergency braking. Emergency braking is an extremely sudden stop.

 

[Tig170]

What you describe is phantom braking, not emergency braking. Emergency braking is an extremely sudden stop.

Must admit - that I've had this once or twice (or more) in the MG4 (early 2022 model (Sept)- now 18 months old) -usually in town, but also on motorways at 70mph+, so far not being rear ended but have been close mainly via lorries (as mainly cruise control at 60mph to ensure that I have enough charge) - I do have a fair few road rages from ICE drivers? - not sure why but i beleive my brakes (via regen kick in at around -13% )

 

[NLMGSAN]

What you describe is phantom braking, not emergency braking. Emergency braking is an extremely sudden stop.

This resembles what I experience on cross roads where cars brake to turn right while I simply want to go straight ahead. The MG than also brakes. Seen some middle fingers already....
The system relies on camera and liedar I read. My guess is it is biased too much to the sides. If others do not experience this at all, it probably is poor calibration causing it.

 

[siteguru]

Must admit - that I've had this once or twice (or more) in the MG4 (early 2022 model (Sept)- now 18 months old) -usually in town, but also on motorways at 70mph+, so far not being rear ended but have been close mainly via lorries (as mainly cruise control at 60mph to ensure that I have enough charge) - I do have a fair few road rages from ICE drivers? - not sure why but i beleive my brakes (via regen kick in at around -13% )

It's when the retardation rate exceeds a certain m/s² that the brake lights must come on (by law), thus whatever regen achieves this will put them on - I think this is closer to -7% regen.

 

[Seaton91]

First instance today- luckily the LR Disco driver behind me was switched on enough to slam on themselves.

Frightened my 6 year old son no end. Only doing about 20, following another MG4 at a steady speed, slowing to come to a roundabout. Oncoming traffic in other lane the only explanation I can think of.

Brakes definitely work!

 

[NLMGSAN]

Caused by another ... MG

 

[Deleted member 14300]

Please don't confuse Lane Keep Assist with Forward Collision system. LKA is shit and needs switching off. Sudden "Automatic Breaking" should not be initiated from LKA. You can set the FCS to Alert if you are afraid. My own feeling is I like FCS and it is better to learn how to live with it (ie indicating or not rolling towards a parked car etc). You may REALLY need it one day.

It's all camera related. I'm famous for the sticker over the camera. Switches so much off, but no phantom stops or LKA incidents. I originally thought sonar may cause it, but sonar sees cars up front but does nothing else.

 

[NLMGSAN]

It's all camera related. I'm famous for the sticker over the camera. Switches so much off, but no phantom stops or LKA incidents. I originally thought sonar may cause it, but sonar sees cars up front but does nothing else.

Depends on what you call phantom breaking. Breaking while overtaking is FCS relatedd. Phantom braking is something else.

 

[jollyman]

Driving out of a Morrison's supermarket at the weekend my MG4 suddenly decided to [for the want of a better phrase] emergency brake. This happened once before in the new year, but I out it down to a one off. Fortunately there was no one behind me, but it did give my passenger and I quite a shock. It was at an exit point with a street bollard nearby. I wonder if somehow the cars system my have mistook the bollard for a pedestrian, and if anyone else has had this problem/reported to a dealer? Once I've had feedback I can then discuss with my dealer. I'd appreciate any feedback from anyone else who have had this happen to them.

I have had the same thing at very low speed ,fortunately ,but the car braked so violently it freaked me and my wife out.I was stopped at a temporary stop light ,pulled out when the lights changed and for a second the front camera must of picked up the hedge on the opposite side of the road and bang the emergency brake banged on,I swore so my wife clipped me round the ear ??‍

 

[NLMGSAN]

I have had the same thing at very low speed ,fortunately ,but the car braked so violently it freaked me and my wife out.I was stopped at a temporary stop light ,pulled out when the lights changed and for a second the front camera must of picked up the hedge on the opposite side of the road and bang the emergency brake banged on,I swore so my wife clipped me round the ear ??‍

So, driving an MG4 now also becomes a hazard for our hearing abilities....

 

[midician]

I have had AEB save me from at least 2 nasty accidents . That’s about the same number of times I’ve had a false trigger of the AEB , so in balance I am pretty pleased with the performance . Interestingly, from 2025 no new car can be sold in Australia without AEB so we’d better get used to it !

 

[NLMGSAN]

But if you disable the brake function it will just beep. You have to go into the menu though each time you start the car.

 

[Surfdog]

https://photos.app.******/oNmeuWL9F4PYCMdS9

Heres a link to my dashcam footage of a recent emergency brake for no reason. Instant stop from 15mph. Not nice.

 

[Coulomb]

https://photos.app.******/oNmeuWL9F4PYCMdS9

That's not a valid URL.

 

[Surfdog]

https://photos.app.******/oaJA9ro14o54rPkz9

If this doesn't work then it not going to.

not a valid

 

[siteguru]

Try using the CODE container (the </> icon) to post the link. The icon is under the 3 dots at the right side it you can't see it. The result:

Looks like this

 

[Surfdog]

https://photos.app.******/oaJA9ro14o54rPkz9

 

[Surfdog]