C8 Stingray Unique Braking System

[John]

GM does not use the traditional and heretofore breaking system we saw in C7’s and earlier. Thank you Fasttoys to bringing this new information to us.

Thank you Autoblog for this analysis, specifically Zac Palmer (author), with more of it at this link:

“The Corvette C8 has electronically adjustable brakes. Here's how they work

Pedal feel changes based on drive mode

New brake systemthat Chevy calls “eBoost brakes.” That’s just a fancy marketing term for brake-by-wire. What this ultimately lets the driver do is adjust the brake pedal feel depending on the mode they put it in.

Plenty of other cars utilize brake-by-wire (mostly hybrids), but performance vehicle applications are still rather scarce — the Alfa Romeo Giulia and Stelvio Quadrifoglio also use it. If you’re unfamiliar with the technology, just compare it to throttle-by-wire, a widely accepted technology seen in pretty much every new car today. It’s the same essential concept. The driver presses down on the brake pedal, sending a signal to a computer. This “force” is then transferred to all the brakes using traditional brake fluid. Chevy is able to eliminate the conventional vacuum-based power brake system, which it says “provides an advantage in efficiency.”

GM is right about that. The C8's “eBoost” unit combines four components — master cylinder, vacuum booster, vacuum pump and electronic brake control module — into one single unit. That means the system is more space- and weight-efficient than a traditional braking system.

Chevy is adding brake pedal feel to the list of elements changed by the adjustable drive modes. Here they are below with a description from Chevrolet.

• Tour: provides a comfortable brake feel for everyday driving
• Sport: provides drivers with an option for more jump-in and a more aggressive feel
• Track: provides a smooth and progressive feel at the limit that allows drivers a wide range of modulation for trail-braking”

Thank you AutoBlog, and again more at their linked site.

[Fasttoys]

Brembo brake by wire

https://www.brembo.com/en/company/news/future-brake

[John]

Thanks for more good information Fasttoys.

[ZORA 69]

Thank You. There is so much technology today in these cars.

[Phil1098]

That's pretty interesting in that there has to be power/electricity for it to work and so if there is a complete catastrophic electrical failure, all the brake-by-wire components are basically out of the way and then it operates on hydraulic only (just front wheels) and you can still stop. This means they step in and are in the equation of the braking system if everything is working right. Like a fail secure electric door strike, it needs power to unlock, but if there is no power your door is locked and stays secured.

[meyerweb]

Not sure I like the idea that if the power fails, I only have front brakes. Or that if there is some electronic component failure, I have only front brakes.

Aside from that, I wonder how closely the artificial feedback compares to the real thing. Of course, most power brake boosted system provide pretty poor feedback anyway.

[Milliwatt Rob]

What happens to your electric power steering when all power fails? To your drive by wire gas pedal?

I suppose in a total power failure with no voltage available to any circuit, the car comes to a stop, with unboosted steering and unboosted brakes.

[Phil1098]

I wonder how closely the artificial feedback compares to the real thing. Of course, most power brake boosted system provide pretty poor feedback anyway.

Might be pretty good, I've driven throttle-by-wire and couldn't tell it wasn't a cable going to a throttle plate with a return spring on it. Here's to hope!

[Phil1098]

What happens to your electric power steering when all power fails? To your drive by wire gas pedal?

I suppose in a total power failure with no voltage available to any circuit, the car comes to a stop, with unboosted steering and unboosted brakes.

Your steering is still mechanical, just boosted effort via electric and the there is still a throttle plate, may be at an idle but it should still run and the brakes are still hydraulic, again just have electric inputs. Electric power steering has been around for many years as is throttle.