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Ioniq 5 antilock brakes

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2K views 27 replies 14 participants last post by  Hitstirrer  
#1 ·
Sooo, after 20k, we got into a close situation with a truck slamming on brakes and sliding around in front of us. I hit the brakes pretty hard and the fronts totally locked and slid. The brakes are great, but touchy, imo. Have had a couple occasions where they were real. So, with the latest recall notice, I asked dealer guys to check.....comment was that they drove it and checked for codes, and as they thought, no problem. I have been on a race track and have owned a lot of sporty cars over the years, and every modern car can light up the anti locks by hard braking, with pedal pressure activation, but no skidding. I am wondering what others have found on this subject. thanks
 
#3 ·
Thanks for your experience. On some cars like former corvettes and porche, I would turn off the active handling sys, esp when jumping humps in the road, otherwise the spinning wheels would result in a locked brake when you hit the pavement. But the antilock is supposed to prevent the wheels from locking at all....an example on the racetrack....high speeds into a sharp corner, hard braking and you can actually turn the vehicle because the wheels are indeed turning. I agree that when mine has locked totally twice now, it did go straight. thanks
 
#6 ·
The only anomaly I have found is when travelling around 30mph downhill and braking normally for a side turn approaching. Presumably that was just using regen. Then, on a couple of occasions, I have braked harder just prior to the turn and probably also engaged the friction brakes.

But twice, that has happened in wet road conditions and with the surface having a steel utilities cover near to the kerb. And twice, the regen/ABS/brakes lost their collective brains and went into a kind of coast with zero brake effect for a metre. An ABS rapid click click click - then brakes held and I almost overshot the turn.

This appears to be a system glitch where regen and ABS conflict right at the interface where they normally blend together. Made worse by a partially slippery metal surface under one front wheel and normal wet tarmac under the other. As I say, a small anomaly. and not particularly dangerous. Just makes you sit up for a second or so.
 
#13 ·
Mine is 2WD. And Grant raises a point that I have not considered, after a lot of years in the business of auto engr related to military vehicles, and also working on my own junk, starting with an engine overhaul on my first car....in the early 60's. That point is....how can you lock up the brakes with direct drive, without stalling an engine. No sweat for a slush box, but what about manual trans or in our case direct drive from a motor and gearbox.....hmmm. But a bit different for my 2WD that has locked the fronts.....dont know about the rears. And finally, yes, brake checks are good for a couple reasons and one is simply to gauge traction in bad weather.
 
#14 ·
The engine does stall if the driven wheels lock up in my experience, it's just like stopping without pushing the clutch down.
Engine restarts though (like a jump start) once wheels start turning again
 
#18 ·
A great bunch of points on the subject....but I still want more on what happens on your Ioniq 5 during ABS. Mine locked, and the dealer says all is good. I have had no other vehicle with ABS that locks the wheels. Keep it up ,with more on your vehicles and hard braking please. And, I may have to fall back on the Hitstirrer points above.....and to be honest, I have no issues with the way the car behaves, but dont think mine has ABS??
 
#19 ·
I have no issues with the way the car behaves, but dont think mine has ABS??
But have you gone out to test that specifically? Easy enough to find a bit of track with a loose gravel surface and try a hard brake from 30mph. You will either lock up and slide along, or hear the familiar ABS knocks. Question answered.
 
#22 ·
I had to slam on the brakes today, too. The wheels locked up!
This forum is mostly English speakers. Please don't ask us to translate eveyrthing.

Since your introduction in the new member forum makes the same complaint, I'll close that to keep the discussion in one place.
 
owns 2025 Hyundai Ioniq 5 Limited RWD
#24 ·
This forum is mostly English speakers. Please don't ask us to translate eveyrthing.
I'm not disagreeing, but I will note that some browsers make translation fairly simple. In the Edge browser, for example, you can select the text, right-click, click More Actions, and then click Translate. The browser will replace the selected text with an English translation (see below). I can't speak to the quality of the translation. Chrome works in a similar fashion but shows the translation in a separate pop-up.

That said, I agree it is (obviously) more efficient if the OP translates once rather than each reader translating.

Image

 
#27 ·
I tested the ABS brakes not long after we got the car. Just as a test. The ABS on this car is different than the other makes of cars we have owned.
There is a stop light on a road we frequently drive. It's downhill to the light and there is a metal manhole cover a couple hundred feet from the light. Many times when braking the ABS or something kicks in when the right front wheel slides on the metal manhole cover. It's a really weird feeling. Like something is wrong with the car. But after thinking it thru I can see why it feels weird.
 
#28 ·
I have experienced the identical thing in a previous Ioniq 28. A downhill approach to a turn off the main road, with a metal service cover exactly where you have to apply more braking to make the turn. One wheel slides on that cover, especially in wet conditions, and the car appears to accelerate and, as you say, acts weirdly. It isn't accelerating, of course, but isn't decelerating as expected either.

The combination of regen /brake/ABS/slippy surface confused the bejasus out of that Ioniq 28 and caused me a split-second of reaction testing. I have since often driven through that same junction in the Ioniq 5 without the same effect though.