How Does Brake-By-Wire Work? Plus: Audi e-Tron Sportback Review!

күнү жарыяланды 2020-ж., 30-сен.
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Is Brake-By-Wire Safe? First drive in the 2020 Audi e-Tron Sportback!
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Audi's e-Tron Sportback features brake-by-wire. What is brake-by-wire, and is it safe? In this video we'll look at the technology and engineering involved with brake-by-wire, talk about why it's done, what benefits it has, and what failsafes exists in case of emergency situations. Brake-by-wire ultimately uses electronic control of the disc brakes. But if things go wrong, there's still a way to stop the car. Check out the video to learn all about it!
From Audi's Press Release:
"New for model year 2021, the Audi e-tron model lines receive impressive revised packaging, including attractive entry pricing with a new Premium trim level. As a result, the e-tron SUV is offered at $65,900 starting MSRP for the model year 2021, a decrease of close to $9,000 from the starting MSRP of the model year 2019 Premium Plus e-tron. The e-tron lineup also receives a number of technical spec enhancements for improved utility. Through optimized drive system hardware and software adjustments, the 2021 e-tron achieves efficiency improvements resulting in an EPA-estimated range of 222 miles, an increase of 18 miles. Meanwhile, the e-tron Sportback delivers an EPA-estimated range of 218 miles.
As technology progresses, the e-tron lineup has seen its most significant improvements with available battery capacity and efficiency. For a more efficient configuration, thanks to a number of optimizations, the front electric motor is able to be entirely disengaged, dramatically reducing power usage when not needed. Only when the driver demands more power or traction do both motors spring into action, providing the surefootedness of Audi quattro® technology and the powerful dynamics Audi is known for.
In addition, the usable amount of the high-voltage battery has increased for the model year 2021 e-tron lineup. The battery in the Audi e-tron and e-tron Sportback have a total capacity of 95 kWh and now gives customers access to a net energy figure of 86.5 kWh- almost 3 kWh more than 2019 e-tron model. The energy buffer is designed to help ensure customers enjoy sustained battery performance throughout the life of the vehicle.
Enhancing the charging experience are dual charge ports on the driver and passenger side of the vehicles, newly available on the Premium Plus trims of the e-tron and e-tron Sportback."
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Engineering Explained
  • Ackket


    2 ай мурун

    I would love to get a new car, especially a EV one, but I cannot afford a new car, hardly anyone can without having to pay it off over the next 10-15 years (might not even have the same car after that long)

  • AdonisGaming93


    2 ай мурун

    brake by wire seems like such a safety risk....if electrical system fails you are done.

    • Engineering Explained

      Engineering Explained

      2 ай мурун

      Did you watch? I explain how they still work if the electronics fail.

  • Xantos Chen

    Xantos Chen

    2 ай мурун

    Hello again Mr. E.e. How do you do the two screens At the beginning of the YouTube vid ? Are using the marketing Are you using Editing team Or do you edit your videos

  • peter PETER

    peter PETER

    2 ай мурун

    Ya I'm going to pay 100k to have this oversized golf cart sit on my garage while I use my 25k camry for normal reliable daily driver

  • Jose Wantland

    Jose Wantland

    2 ай мурун

    I have some automobile knowledge background and I truly believe Brake By Wire system Is a better way to go, mainly because is sending more accurate controlling braking power to each individual wheel base on information that all the electronic components ( Computers etc ) are receiving during the driving conditions ( tire pressure, speed, turning angles, g-force, road condition, amount of passengers , cargo, how level the road is, down or up hill ) and some other variants.

  • Greg Warner

    Greg Warner

    2 ай мурун

    Great until the computer says "please use control, alt, delete" thank you.

  • GeFeldz


    2 ай мурун

    10:52 R.I.P. trash panda =(

  • eivis13


    2 ай мурун

    You could have used a pre fl iconic prius, maybe even a classic prius just to prove a point.

  • RickitySplitz


    3 ай мурун

    Too overly complicated for something like this.

  • Kevin Mills

    Kevin Mills

    3 ай мурун

    So it’s a second car for local urban running around? How much does it cost?

  • Richard Kuil

    Richard Kuil

    3 ай мурун

    more sensors means more faults......

  • odysseyrider1


    3 ай мурун

    Lmao the thumbnail😂😂😂 bro

  • William V

    William V

    3 ай мурун

    Great job on your animated illustrations!

  • HECKproductions


    4 ай мурун

    i think it's a bad thing how this tries to be more "beginner friendly"
    because that has lead to people not being able to solve even the simpelest problem on the computer
    like i use a program that needs java runtime enviroment and when you first fire it up it literally says "browse the path to your jre folger here" and "if you don't have one download it from" and then a link to java dot com
    it's so simple a child could do it but most people i know weren't able to do if for the life of them
    i'm afraid that in like 30 years a car will be warning about tyre pressure and the average dumbass user is gonna be like wAt iZ tYrE

  • CSLFiero


    4 ай мурун

    braking with a potentiometer is a terrible idea in sim equipment, so it's a terrible idea in an actual car.

  • Dreigo42


    5 ай мурун

    Can I get one of those pedal simulators in my sim rig? That'd be pretty cool...

  • Rennie Allen

    Rennie Allen

    5 ай мурун

    So Columbo would have his work cut out in 2020 because he would be able to find any brake fluid on the driveway that indicates that Mr Keppel cut Mr Norris's brake lines. Cutting some wires leaves no telltale evidence in the driveway.

  • Cody Schleiger

    Cody Schleiger

    5 ай мурун

    Would never buy one of those used LMFAO. Money pit of death!

  • rootsid


    5 ай мурун

    I live in Iowa, the weather here is horrible one either needs heat or air conditioning most of the time. How much will that 220 mile range suffer?

  • zoperxplex


    5 ай мурун

    Typical German engineering: take a relatively simple system and make it more complicated and expensive.
    Wait a few more years and the German auto industry will be assuring you that drive by wire is a safer system as well.

  • No one Important

    No one Important

    5 ай мурун

    Just FYI my 16 camaro I hit 0.8 gs braking

  • kashyapa fernando

    kashyapa fernando

    5 ай мурун

    So is it basically when the electronics brake system computer detects less than 0.3 g’s it will slow down the vehicle using the regenerative system while charging the battery 🔋 and once detected more than 0.3 g’s it will open a valve and activates the mechanical brakes using hydraulic brake fluid?

  • MXT


    5 ай мурун

    How about we make cars where you plug and play your wheel into or like I do with my pc

  • Clickmaster5k


    5 ай мурун

    A smaller battery with less range but less weight so more efficiency and faster charge time would be way better for around town. Gota look at miles per min of charge more than just all out miles.

  • John Smith

    John Smith

    5 ай мурун

    I LOVE BBW :)

    oops wrong video..

  • mobilemowers


    5 ай мурун

    Over complicated computers taking over all the braking. Now another system you can't work on at home unless you have expensive diagnostic equipement. Then replacing the expensive leectric parts when they fail much less really be bale to test them. Shot nowadays you need a scanner just to replace the parking brake or bleed the brakes. I hate to see it shorts out while driving or simle jump starting the car shorts it out. So sad most people can't even on thier own cars and have to spend $125 plus an hour to get it fixed. Then thier 20% mark up on parrts. Keep it simple. This video should be called over engineering explained.

  • G


    5 ай мурун

    If this is how the industry defines "brake by wire", then it is brake by wire. Simple.

  • Reynaldi


    6 ай мурун

    i mean MGU-K works well for F1....

  • Audun


    6 ай мурун

    Set a custom charge finish level: Press vechicle on the MMI display -> Charging and efficiency -> Charging -> Press charge level indicator , then adjust "Charging target". Valid levels are 50-100 in incriments of 10

  • FutureSystem738


    6 ай мурун

    ETron’s efficiency sucks- just say it!

  • Specialopsdave


    6 ай мурун

    I drive a hybrid without brake-by-wire, so the regenerative braking has no pedal resistance and feels weird

  • hunter alber

    hunter alber

    6 ай мурун

    okay thats is true

  • Lawrence Fearon

    Lawrence Fearon

    6 ай мурун

    Kindly thank your neighborhood Mercedes R230 SL for introducing Brake-By-Wire to the world in 2001.

  • HowManyTabsYouGotALot


    6 ай мурун

    '"Some say he uses four limbs to control each brake, and one eyebrow for turn signals. All we know is he's called the Stig!"'

  • mgsboedmisodpc2


    6 ай мурун

    a double episode

  • Parzival


    6 ай мурун

    I’d rather not put my trust into some wires that will eventually short out

  • Basilhs T

    Basilhs T

    6 ай мурун

    It has a front grill, CUTE !

  • Johnmichael Quinlan

    Johnmichael Quinlan

    6 ай мурун

    Everyone wants the biggest range, its not the length its how you use it !!!! :D

  • ravioli sauce

    ravioli sauce

    6 ай мурун

    oh boy, just another thing to brake

  • Nick Byrd, Ph.D.

    Nick Byrd, Ph.D.

    6 ай мурун

    “, the oblivious consumer...” 🤣

  • double-you


    6 ай мурун

    wow that will break, knowin' its an audi.

  • Zac Jarvis

    Zac Jarvis

    6 ай мурун

    5.5 seconds for the 0-100k sprint? Pretty sure my 98 wrx does just as good if not better.

  • Zac Jarvis

    Zac Jarvis

    6 ай мурун

    Every mechanic watching this is straight panicking knowing your life is in the hands of a sensor.

  • Weeaboo Patrol

    Weeaboo Patrol

    6 ай мурун

    In the camera world, we have 2 types of mechanics that we use to focus. Fly-by-wire and mechanical focus. Guess which one professionals always use? Mechanical. The precision and accuracy in a mechanical set-up gives the operator more control and feedback than an electronic device.

  • dnz vpr

    dnz vpr

    6 ай мурун

    You are good engineer. Please Could you explain how hyundai imt transmission works. İ am really interested in this transmission.

  • Miguel Angel Vizuet Mata

    Miguel Angel Vizuet Mata

    6 ай мурун

    So if this fails, are you sure you won’t be geobraking?

  • Raymond Alamo Jr

    Raymond Alamo Jr

    6 ай мурун

    Dude - I love your video! Keep it up!

  • David Leonoff

    David Leonoff

    6 ай мурун

    Are those shift paddles on the steering wheel? Huh?

  • AirRatchetJockey


    6 ай мурун

    So it’s basically a standard hydraulic system with electric assist vs vacuum.

  • Robert Clements

    Robert Clements

    6 ай мурун

    You seem smart. How come you haven't come out for Thorium yet?

  • Ryan Davey

    Ryan Davey

    6 ай мурун

    What controls braking if your car is off, let's say a scenario where the battery dies and you need to push it?

  • MorrisJ 2000

    MorrisJ 2000

    6 ай мурун

    People get mad when you call an electric motor an engine, but by definition it is: "a machine with moving parts that converts power into motion"

  • Christian Thomas

    Christian Thomas

    6 ай мурун

    The CD isn't an absolute number. It's proportional to the frontal area. That's why it doesn't go as far.

  • Hudson Hornet

    Hudson Hornet

    6 ай мурун

    A lot of people don’t realize brakes only slow you down in life

  • Erinn McCrankypants

    Erinn McCrankypants

    6 ай мурун

    Whoa whoa whoa audi! You haven't even graduated past making a door handle that doesn't immediately break maybe we should take baby steps on designing the future of brakes...

  • FalconXE302


    6 ай мурун

    "Is it safe"... quite possibly the silliest question have have asked Jason... LoL... just joking.
    But yeah... if it has found it's way into a lot of road going cars... I am quite happy that "it is safe".
    Great video Jason... as always very interesting

  • Cornel Bogdan Macrineanu

    Cornel Bogdan Macrineanu

    6 ай мурун

    But for that valve to open, what do you need? Is it electrical? If so, no thank you.

  • Chris Bradbury

    Chris Bradbury

    6 ай мурун

    What a roundabout way to brake.

  • guits


    6 ай мурун

    Mercedes did electronic brakes years ago. Worst thing that happened was that you ended up in limp mode I think. There was an extended warranty and stuff not lasting long enough so I think they reverted back to just ABS for most cars and I'm not sure they still use it at all now. Or have a different system.

  • Brulaap Gaapmeester

    Brulaap Gaapmeester

    6 ай мурун

    What if a mouse shits in your potentiometer and the cat that chased it eats the fail safe system instead of the mouse?

  • Valtteri Wikström

    Valtteri Wikström

    6 ай мурун

    I think that there should be full mechanical or hydraulic connection after something like 75% of pedal travel. Without that there's too many things that can fail. I would feel unsafe driving older car with pure Brake-By-Wire technology. Some system checking whether or not the others are working can give false positives.

  • Peanut


    6 ай мурун

    Lol... why do we feel the need to be sophisticated? Plus, imagine working on these new cars.

  • midnightgolfer


    6 ай мурун

    range matters

  • Second4218


    6 ай мурун

    Just a way for Audi to make their cars even heavier and slower.

  • Ryan I

    Ryan I

    6 ай мурун

    So what is the purpose of brake by wire on non-hybrid or electronic cars? I have the Alfa Romeo Giulia and although I like the brakes a lot, I've wondered why they went by wire with them. Especially if there is a back up hydraulic system, then you're not even saving weight...

  • Second4218


    6 ай мурун

    If it is on an Audi, it is going to fail, quickly.

  • Tango Trike

    Tango Trike

    6 ай мурун

    He looks like a highschool/college student. And also a father at the same time.

  • Andrew Seger

    Andrew Seger

    6 ай мурун

    Hey Jason, can we get a video on your thoughts as to why the Ferrari F1 team is doing so poorly, and possible reasons behind the massive performance losses we are seeing in their car this season? Donut just did a video but I'd love to hear a more technical point of view.

  • Gacheru Mburu

    Gacheru Mburu

    6 ай мурун


  • HmongGuitarPlayer


    6 ай мурун

    Well if the that fail you will wish you have a hole through the floor board so you can do a Fred flinstone braking.

  • Chris S.

    Chris S.

    6 ай мурун

    The base model epa rating is done with the base aero wheels. I assume the sportback version comes with nice wheels as standard since it is a design over function car anyway. So that would explain the lower range rating. Funny business with standard wheels and efficiency ratings is common in the european market.

  • Y B

    Y B

    6 ай мурун

    Is there a way to submit requests for videos?

  • Fuse


    6 ай мурун

    Classic german engineering. Lets take something simple that works and complicate the hell out of it no good reason whatsoever.

  • Paul Son

    Paul Son

    6 ай мурун

    This sounds horrible

  • Regenmeister


    6 ай мурун

    More over engineered electronic crap...

  • mravecsk1


    6 ай мурун

    Crazy low range for big BP like this. Because of that it charges very fast at the expense of battery "lifespan" and degradation. Also remnats from ICE that make no sense in an EV. So, it is nice car but not realy good EV.

  • phil spencelayh

    phil spencelayh

    6 ай мурун

    By the time I got the the end I had forgotten that the film was about "Brake by Wire" . It had got back to range anxiety as always with electric cars, which really isnt a real problem to most people who have enough money to spend $70,000 on a shopping car and keep another with decent range for when you actually need to go a bit further afield.

  • crosstheborder731


    6 ай мурун

    300 mile range?
    *Laughs in 30 y/o V8 Mustang

  • Terry Ball

    Terry Ball

    6 ай мурун

    Ètron is turd in French.

  • LTVoyager


    6 ай мурун

    And ICE cars only need a 5 gallon gas tank most of the time. However, occasionally you do and that is why they have 15+ gallon tanks. EVs are no different. There may be times you come home and your power is off all night and you need to drive another day on your battery without an overnight charge. Or you need to evacuate from a hurricane and need the range. Tesla got it right going for range as close as possible to existing ICEs. To do otherwise is not very smart if you want to gain any market share.

  • LTVoyager


    6 ай мурун

    This is fairly old technology. My 2007 BMWK1200LT has a system nearly identical to this, sans the regen obviously. Nothing new to see here.

  • james becker

    james becker

    6 ай мурун

    OMG... thank you for bringing up the FACT that in 90%+ of the family situations, people do not need a 500 or 600 mile range EV. 150 or 200 is overkill for most people. The car will be lighter, cheaper, and more can be made since they are not hogging so many battery cells. The typical consumer drives only 20-40 miles per day. Not 300.

  • Calvin W

    Calvin W

    6 ай мурун

    Thanks. I hate it.

  • KRAUSER0130


    6 ай мурун

    Don't get me wrong, VW/Audi fanatic here :D but what was wrong with regular brake system? This is just complicated and unnecessary = expensive to make and get fixed once something goes bad in it. Hydraulics is doing pretty good job for the last.. 50, 60 years? And basically entire system is some kind of failsafe, so if we are going to mention redundancy.. Well that's just my opinion. Things are being more advanced and modern, BUT is it always for the better? Maybe I am too old-school and but one thing will never go out of fashion; if you don't have it, it won't fail! Well, cool looking Audi, I have to give it that, BUT the only thing that it's missing is TDI version. I never cared THAT much about emissions and soot and NOx.. Yeah diesel this, diesel that.. But my 1.6 turbo diesel can go for over 800 miles with one tank of gas, burns less fuel than a lighter! But nobody cares about all the gasoline engines that are often burning 3 times more fuel than what I just mentioned, AND for some reason that's okay, but what do I know... However Audi said they don't plan to say goodbye to diesel engines any time soon despite electrification, so I'm good ;)

    • Michael Gia Huy Nguyen

      Michael Gia Huy Nguyen

      6 ай мурун

      If you're driving an high-end car like Audi, you should be able to afford the service done on these cars anyway

  • Four utubez

    Four utubez

    6 ай мурун

    I'd expect the braking pressure to be measured by a load cell rather than position sensor ? Or did I miss something ?

  • David Smedley

    David Smedley

    6 ай мурун

    I have experienced the tandem motor that powers these kinds of brakes fail on a 2017 Accord hybrid (there is now a recall for it). Let me just say thank goodness for the parking brake. Even standing on the brakes all I got was ABS vibration and practically no braking force. I would never buy a hybrid again or a Honda for that matter.

  • Maza


    6 ай мурун

    If it is basically a hydraulic system then why npt run ot like that. No need for all those electronics.

  • Jordan Ketterer

    Jordan Ketterer

    6 ай мурун

    I was thinking if a EV with independent four-wheel drive were Ariel couldn't have a pretty good amount of attitude adjustment through gyroscopic and rotational Force each wheel could independently move and break accordingly to be able to change the attitude of the vehicle to better land and keep people safe in case of high speed collisions

  • BBKing1977


    6 ай мурун

    If you use only regen braking, do you risk premature corrosion of rotors due to lack of use?

    • Francisco Shi

      Francisco Shi

      6 ай мурун

      I am doing an ev conversion. I am having two motors one for front and one for back. So far I have been tesing the drive train on a rolling chassis that has no brakes (no master cylinder and no brake pedal) and so far with only half of the available regen I can drive like a normal car without ever having to reach for the brake pedal. Some one once saw me driving and asked me how did I get the brakes to work without the master cylinder. So I am certainly going to have to deal with the issue of rusting rotors. I have considered getting them chrome plated but not sure if that is a good idea.

    • Engineering Explained

      Engineering Explained

      6 ай мурун

      They will get enough use to keep the rotors clean each time you drive, even if you barely touch them.

  • Green Goat

    Green Goat

    6 ай мурун

    Mercedes tried this, and it sucked for some very unavoidable reasons. Don't glorify a safety hazard

  • where's fillman86

    where's fillman86

    6 ай мурун

    Not going to fail? I seem to remember Toyota having to do a recall on this exact type of system

  • dafff08


    6 ай мурун

    all these people scared of electronics.
    what about steer by wire?
    its a thing for quite a while now.
    never heard of any problems because of it.
    the problem is not electronics, its poor build quality and lack of redundancy.



    6 ай мурун

    My Model 3 gives me around 200 miles max and I’ve never needed to supercharge in 1.5 years of ownership. Warm weather months I charge to around 75% a day and during the winter I charge to around 85% a day, and it’s always been more than enough for my daily 90 mile work commute including lunch trips and occasional full throttle fun. In other words, range anxiety isn’t something I ever have. And if I’m in trouble, I have superchargers all over the place. You just need to plan slightly if you know you’re going on a longer trip the next day, just set it to more charge that night. You simply think of your garage as the “gas station”. I’ve charged to 100% maybe twice in 1.5 years.

  • justinl458


    6 ай мурун

    2 of the most misspelled words on YouTube that piss me off is *Brake* and _Break_ and *Lose* and _Loose_ Really shows how many people are dumbass degenerates who are ignorant.

  • Paul Bailey

    Paul Bailey

    6 ай мурун

    I had a 37 Ford that was brake by wire

  • Chasing Dragons

    Chasing Dragons

    6 ай мурун

    Can you go back to doing your homework and explaining things honestly?
    Firstly you are driving an AUDI. Check the price tag for a second. I realize as an engineer you are accustomed to this idea that you get paid well enough to afford toys but for goodness sake actually explain to people the real reason brake by wire hasn't made it to the US yet.
    It's called the LAW. For example, according to FMVSS 121 a compliant pneumatic system MUST be on a commercial truck. This makes EBS EXPENSIVE to field in the US. No commercial fleet is going to willfully spend MORE money on something that ultimately does the same thing... stop the truck. Current braking systems, if they could be measured in horsepower on an 80,0000 / lbs vehicle would clock well over 9000 horsepower.
    You are driving an AUDI. It can have effectively TWO braking systems because it is EXPENSIVE.
    Honest. This video is about as bad as the time J Leno mistakenly said the Chrysler Turbine Car never caught on because it didn't like LEADED fuel... which isn't WRONG entirely... it just skips right over the inconvenient part where the jet engine produced a pathetic 130 horsepower, the fuel economy was as bad or worse as a V8 of the same vintage, but it was 10 TIMES MORE EXPENSIVE.
    Heavy Duty Trucking System, Sixth Edition by Sean Bennett, pgs. 1023-1024
    Drive: The Definitive History of Driving, pg. 215

  • rocko44444444


    6 ай мурун

    There are lots of airplanes with drive-by-wire system, without any major issue. I don't see a problem to use in cars.
    Excluding Boeing 737 MAX.

  • Evan Angeletos

    Evan Angeletos

    6 ай мурун

    Not made to last.Expensive to maintain and repair.

  • DJMMAS14


    6 ай мурун

    So what if the valve don't open and I can't brake.....

    • Chris C

      Chris C

      6 ай мурун

      Lawsuits happen then

  • David


    6 ай мурун

    my problem is the fail safe valve is closed until there is a problem. Giving that most people don't change the brake fluid that valve could get gummed up, so say at a 150,000-200,00 miles something in the system fails the valve tries to open but cant. Then what? you're fucked that's what.