Electric Vehicles

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Electric Vehicles are a key part of our tomorrow and how we get there. If we can get all the fossil fuel vehicles off our roads, out of our seas and out of our skies, we'll have a much better environment. This community is where we discuss the various different vehicles and news stories regarding electric transportation.

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Chinese EV Brake Pedal Snaps Three Times During Testing (www.thedrive.com)

submitted 2 days ago by tardigrade@scribe.disroot.org to c/electricvehicles@slrpnk.net

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The testers even bought a brand-new model just to make sure this was no coincidence—and it wasn't.

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A brake pedal snapping during an emergency stop is just about one of the worst calamities that can happen on the road, and it appears a luxury EV in China carries that risk right now. Three Maextro V800 vans—built by JAC Group and tech giant Huawei—separately suffered three pedal fractures during 60-to-0-mph braking tests, prompting the manufacturer to begrudgingly commit to fix the component’s design and provide owners free replacements.

These tests made the rounds on Dongchedi, a car content platform that happens to be owned by ByteDance, which also runs TikTok. The first two failures happened to low-mileage vehicles, and their pedals snapped on their third and fourth runs. The third failure struck a brand new van purchased later, and its pedal collapsed on the second attempt.

Each failure required the testers to immediately engage the Park gear as a makeshift emergency brake, which does eventually stop the vehicle—though, as you can see in the footage, not quickly. The video below is in Chinese, but it’s not hard to get the gist of what’s going on. The driver presses hard, something audibly breaks, and the pedal falls all the way to the back of the footwell, dangling.

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[–] CompactFlax@discuss.tchncs.de 16 points 2 days ago* (last edited 2 days ago) (1 children)

Engaging the park gear at speed on an ICE wouldn’t do much, because the pawl would snap. Do they mean parking brake?

The automaker’s position is that these defects were discovered during “non-standard, extreme test conditions,”

yes that’s what emergency braking is. Non-standard use. It might happen twice in a vehicles lifetime or 200 times a day depending on whether the driver is a bus driver, but in any case it must not break.

[–] dgriffith@aussie.zone 3 points 1 day ago

Engaging the park gear at speed

I guess it's from the fact that "D" / "P" / "R" are on the selector, so "Park" gets promoted to honorary gear status these days.

Putting an EV into "Park" activates the (electrically actuated) parking brake. Which isn't really made to be activated when the vehicle is in motion, so it's anyone's guess whether it will burn out its tiny brake pads before you actually stop.

In any case, that brake pedal should be able to withstand as much force as a human can place on it. Plus a bit, because humans can be unexpectedly strong when they are stressed out. Ideally from a design perspective it would be able to travel until it reaches the floor and then be supported by the floor.