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C8 ME To Have “Brake By Wire” System

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  • C8 ME To Have “Brake By Wire” System

    Will one of the ways the mid engine Corvette save weight would be to have a brake by wire system?

    [Quote=gmauthority]ZF Highlights Brake By Wire System In Silverado, Sierra
    As high-efficiency engines fail to produce enough vacuum pressure to generate the ideal amount of stopping power, German supplier ZF has introduced its answer. The 2019 Chevrolet Silverado and 2019 GMC Sierra are some of the first vehicles to benefit.

    It’s called Integrated Brake Control (IBC) and it replaces the vacuum booster and associated cables, sensors, switches, electronic controllers and vacuum pumps. According to a Wards Auto report last Thursday, the system works with a pedal simulator. Fluid in the master cylinder is displaced to an accumulator and the system measures pedal travel. A motor with a ball screw then pushes a plunger to deliver hydraulic fluid to the wheels.

    According to ZF, the motor can do all of this and generate brake pressure measuring 1 g in just 150 milliseconds. Automatic emergency braking is also quicker with IBC; the system can deploy full stopping force in a quarter of the time compared to a traditional braking setup.

    Another benefit of the system is the ability to incorporate the electronic stability control in the one module. Thus, the 2019 Silverado and 2019 Sierra feature one package for the braking and stability control system. It also saves 11 pounds over traditional components.


    ZF added it has contracts in place to provide the IBC system to eight vehicle platforms between multiple companies by 2020. Several more automakers plan to tap ZF for the technology, and there’s a very good chance we’ll see IBC also make its way to the next-generation Chevrolet Tahoe, Suburban, GMC Yukon and Cadillac Escalade. The SUVs will share the new full-size pickups’ T1 platform.[/Quote[

    Read more: http://gmauthority.com/blog/2018/10/...#ixzz5UmiV1IWR
    GBA Black; HTO Twilight/Tension interior; Z51 & Mag Ride; E60 lift; 5VM visible carbon fiber package; 5ZZ high wing; FA5 interior vis CF; ZZ3 engine appearance; 3LT; Q8T Spectra Gray Tridents; J6N Edge Red Calipers; SNG Edge Red Hashmarks; VQK Splash Guards; RCC Edge Red engine cover; VJR illuminated sill plates. Lifetime, annual contributors, and 23 year members of National Corvette Museum. Home is the beautiful Pacific Northwest.

  • #2
    OK Sounds great , just wondering how it would act if the pedal simulator were to become inoperative? Total Loss of Braking? At least with the hydraulic systems and a vacuum booster there is still braking even if a leak develops on one of the fluid lines. However if it proves to be safer somehow - Bravo.
    Rocket City Florida- 2001 ZO6 - 2013 427 Vert - 2020 Stingray

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    • #3
      Would be nice for the ME not have the weight, cost and complexity of running hydraulic brake lines to the opposite end of the car.
      GBA Black; HTO Twilight/Tension interior; Z51 & Mag Ride; E60 lift; 5VM visible carbon fiber package; 5ZZ high wing; FA5 interior vis CF; ZZ3 engine appearance; 3LT; Q8T Spectra Gray Tridents; J6N Edge Red Calipers; SNG Edge Red Hashmarks; VQK Splash Guards; RCC Edge Red engine cover; VJR illuminated sill plates. Lifetime, annual contributors, and 23 year members of National Corvette Museum. Home is the beautiful Pacific Northwest.

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      • #4
        Originally posted by Frenzy36 View Post
        OK Sounds great , just wondering how it would act if the pedal simulator were to become inoperative? Total Loss of Braking? At least with the hydraulic systems and a vacuum booster there is still braking even if a leak develops on one of the fluid lines. However if it proves to be safer somehow - Bravo.
        Good point. There are cars on the road that have BBW systems, but as far as I know they have a redundant purely hydraulic system in place as a failsafe, so they don't save any weight. There are plenty of electric / electronic only control systems on cars, and other items, that we don't demand a mechanical backup for, but generally not critical safety systems. For example, our windows don't have a mechanical crank backup, but our door locks do.

        Oh, and I'm sure this BBW system still has dual master cylinders to that you don't lose all braking in the event of a leak to one wheel. In the U.S., that's a federal mandate.
        Delivered 5/29!: Scarlet Fever 2021 2LT HTC, Red Mist Metallic Tintcoat, two-tone Natural w/ suede inserts, Mag Ride, Performance Exhaust

        Gone but not forgotten: SunKissed, 2015 2LT, 7MT, Black over Daytona Sunrise Orange Metallic, Stingray convertible

        Proud member of the Old Dominion Corvette Club: https://www.olddominioncorvetteclub.org/

        Never grow up - It's a trap.

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        • #5
          This could be an interesting development, especially as it is not in the patent stage, but already in production Chevy trucks. However, like always, the devil is in the details.

          One thing is for sure, is that we are, as typical, lacking in the key details. But maybe a promising enhancement?
          Enjoying my Shadow gray C8. What a car it is.

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          • #6
            A poster named “Rruuff” further learned that the brake-by-wire system, at least on a Chevy pick up, results in an 11 pound weight reduction. That is very nice!
            GBA Black; HTO Twilight/Tension interior; Z51 & Mag Ride; E60 lift; 5VM visible carbon fiber package; 5ZZ high wing; FA5 interior vis CF; ZZ3 engine appearance; 3LT; Q8T Spectra Gray Tridents; J6N Edge Red Calipers; SNG Edge Red Hashmarks; VQK Splash Guards; RCC Edge Red engine cover; VJR illuminated sill plates. Lifetime, annual contributors, and 23 year members of National Corvette Museum. Home is the beautiful Pacific Northwest.

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            • #7
              Thinking about this a little more, almost all late model cars on the road have drive-by-wire throttles, including our C7s (and probably C6s, too). I haven't read of any failures of those on the forums, or heard anecdotally about any issues with other cars. We may be at the point where these systems are more than reliable enough.

              Aside from that, I'm not sure this prevents manual braking if the system fails. ZF's web page says "replace[s] the electronic stability control, vacuum booster, and vacuum pump (where needed), as well as associated cables, sensors, switches and controllers... Fluid in the master cylinder is displaced to an accumulator and the system measures pedal travel.." It sounds like it's replacing the vacuum booster with an electric booster. So I think there is still a physical connection between the brake pedal and the hydraulic system, and the electronics are measuring how far you pushed the pedal by measuring how much fluid is displaced.

              Were I designing this, I would do it so that if the electronics fail a valve opens, routing the hydraulic fluid pushed by the brake pedal directly to the brake lines going to the wheels. Losing the electronics would be the same as losing power brakes on car with a vacuum booster. The pedal is real hard to push, but you still have brakes. (I've experienced this on old cars with power brakes that didn't have a vacuum accumulator: if the engine stalled, the power assist went away.)
              Delivered 5/29!: Scarlet Fever 2021 2LT HTC, Red Mist Metallic Tintcoat, two-tone Natural w/ suede inserts, Mag Ride, Performance Exhaust

              Gone but not forgotten: SunKissed, 2015 2LT, 7MT, Black over Daytona Sunrise Orange Metallic, Stingray convertible

              Proud member of the Old Dominion Corvette Club: https://www.olddominioncorvetteclub.org/

              Never grow up - It's a trap.

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              • #8
                I believe my alfa stelvio ti sport has brake by wire. In my opinion its seamless

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                • #9
                  Thank you. I remain excited by its being, in the 2019 Chevy PU’s, 11 pounds less. Maybe this is part of GM’s lightweighting program. Hope we see tens more example of this program in become ME reality. What we all would not give for the ME to weight 100+ pounds less than a comparable C7.

                  If you have not yet watched this 2:15 video, it is the most exciting video I have watched this past year! It shows one component being computer re-designed to save 40% mass and simultanteously reduce the part count from eight parts to just one.

                  https://video.marketing.gm.com/10508...-weighting.mp4
                  Last edited by John; 10-24-2018, 07:24 PM.
                  GBA Black; HTO Twilight/Tension interior; Z51 & Mag Ride; E60 lift; 5VM visible carbon fiber package; 5ZZ high wing; FA5 interior vis CF; ZZ3 engine appearance; 3LT; Q8T Spectra Gray Tridents; J6N Edge Red Calipers; SNG Edge Red Hashmarks; VQK Splash Guards; RCC Edge Red engine cover; VJR illuminated sill plates. Lifetime, annual contributors, and 23 year members of National Corvette Museum. Home is the beautiful Pacific Northwest.

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                  • #10
                    Wow, zombie thread. (The last post before today was in October of 2018). Welcome to the forum, annykidsman.

                    FWIW, Harlan Charles (C8 program manager) has completely debunked the rumor that the C8 has brake by wire. It is e-boost (electric boost instead of hydraulic), not brake by wire. So there's no vacuum pump to replace.
                    Delivered 5/29!: Scarlet Fever 2021 2LT HTC, Red Mist Metallic Tintcoat, two-tone Natural w/ suede inserts, Mag Ride, Performance Exhaust

                    Gone but not forgotten: SunKissed, 2015 2LT, 7MT, Black over Daytona Sunrise Orange Metallic, Stingray convertible

                    Proud member of the Old Dominion Corvette Club: https://www.olddominioncorvetteclub.org/

                    Never grow up - It's a trap.

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