E-brake

[J Alynn]

So I was wondering. Do EV’s need E-brakes of any kind or due to frictions does emergency brake and/or parking brake even need to be there? Does computer just “lock” the friction so wheels don’t roll? EV is completely new to me and was just wondering? Thanks ahead of time!

 

[cyure]

So I was wondering. Do EV’s need E-brakes of any kind or due to frictions does emergency brake and/or parking brake even need to be there? Does computer just “lock” the friction so wheels don’t roll? EV is completely new to me and was just wondering? Thanks ahead of time!

Oh yeah, how does that work?

 

[SpaceEVDriver]

Both the Lightning and Mustang have a parking pawl built into the rear motor gearboxes.
I believe parking brakes are required by federal regulations, but I’m not 100% certain of that.

 

[oldgeeksguide]

So I was wondering. Do EV’s need E-brakes of any kind or due to frictions does emergency brake and/or parking brake even need to be there? Does computer just “lock” the friction so wheels don’t roll? EV is completely new to me and was just wondering? Thanks ahead of time!

I’m a little unsure what you mean. Surely an ev needs a parking brake just like any other car, and an emergency brake is needed as well, when other things fail. What am I missing?

 

[dreamweaver]

From what I understand each EV manufacture does this in a slightly different way. But, most electric vehicles (EVs) have both a parking pawl and an electronic parking brake (e-brake). The parking pawl locks the "transmission" in place, while the e-brake is activated electronically to hold the vehicle stationary.

 

[J Alynn]

From what I understand each EV manufacture does this in a slightly different way. But, most electric vehicles (EVs) have both a parking pawl and an electronic parking brake (e-brake). The parking pawl locks the "transmission" in place, while the e-brake is activated electronically to hold the vehicle stationary.

That helps. I was having trouble writing my question but your response is perfect

 

[dreamweaver]

FYI, The AAM e-Beam axles and electric drives units have an optional Park lock.

 

[Jkew]

Interestingly a lot of EVs use at least one set of drum brakes, partly because the regenerative braking means you use your brakes leas often and drum brakes are better protected against the elements. I presume the drum brakes are used for the e-brake as well.

On my VW ID.4 the drum brakes result in some interesting braking behaviors and even less even braking at the end of a stop. It doesn’t really bother me, but it is interesting.

There is a great you tube video on this here:

 

[dreamweaver]

Interestingly a lot of EVs use at least one set of drum brakes, partly because the regenerative braking means you use your brakes leas often and drum brakes are better protected against the elements. I presume the drum brakes are used for the e-brake as well.

On my VW ID.4 the drum brakes result in some interesting braking behaviors and even less even braking at the end of a stop. It doesn’t really bother me, but it is interesting.

There is a great you tube video on this here:

EV & Drum Brakes: One step Forward and one step Back.

 

[Cranky Canuck]

So I was wondering. Do EV’s need E-brakes of any kind or due to frictions does emergency brake and/or parking brake even need to be there? Does computer just “lock” the friction so wheels don’t roll? EV is completely new to me and was just wondering? Thanks ahead of time!

Short answer; yes. Pretty sure having an "e-brake" (aka parking brake) is a legal requirement. Every EV I've ever owned has both a parking brake and what feels like a parking pawl but I'm not 100% on whether it's an actual physical parking pawl or some electronic magic with the motors. Either way there are friction brakes on all EVs and they all have some form of parking brake/e-brake just like a regular car.

 

[J Alynn]

Short answer; yes. Pretty sure having an "e-brake" (aka parking brake) is a legal requirement. Every EV I've ever owned has both a parking brake and what feels like a parking pawl but I'm not 100% on whether it's an actual physical parking pawl or some electronic magic with the motors. Either way there are friction brakes on all EVs and they all have some form of parking brake/e-brake just like a regular car.

I guess I should have asked differently but appreciate learning from everyone. I should have asked do they get a physical brake or just an electronic lock down signal, etc…. Thank you all for the feedback. It’s been good

 

[dreamweaver]

I guess I should have asked differently but appreciate learning from everyone. I should have asked do they get a physical brake or just an electronic lock down signal, etc…. Thank you all for the feedback. It’s been good

Hey. No wrong questions here. I hope you got the information you were looking for.

 

[Cranky Canuck]

I guess I should have asked differently but appreciate learning from everyone. I should have asked do they get a physical brake or just an electronic lock down signal, etc…. Thank you all for the feedback. It’s been good

Oh! That is a good question. Every EV still has physical friction brakes, either disc or drum or a combination of the two. Whether it's manually operated with an old school cable or hydraulics, or whether it's electronically actuated depends on the car maker. Mine is electronically actuated in my Ioniq 5 but in our PHEV it was a hydraulic system.

 

[Time2Roll]

My LEAF, RAV4-EV and I-Pace have (had) an electric actuated parking brake. I believe only the LEAF had a pawl.

RAV4-EV has a Tesla drivetrain which has no pawl.

 

[Chavannigans]

I am fine with whatever they choose, but there is something about older cars rocking back a little bit after you put it in park... If they chose a pawl it would just feel less like a sterile future car and more familiar to people making the switch from ICE cars..

 

[J Alynn]

I’d actually like a legit manual e-brake just in case brakes ever fail but guess friction and set up is probably hard to see happen in an EV with a motor but who knows

 

[J Alynn]

On another tangent as I was out today and saw a t-boned van in the grass over the curb it got drilled by a Suburban. So question. If we do go with lifts on the Scouts and a smaller car T-bones would we automatically be assuming the battery pack is shot for good. Gotta think there is a risk there that’s unique to a high set EV?

 

[Chavannigans]

On another tangent as I was out today and saw a t-boned van in the grass over the curb it got drilled by a Suburban. So question. If we do go with lifts on the Scouts and a smaller car T-bones would we automatically be assuming the battery pack is shot for good. Gotta think there is a risk there that’s unique to a high set EV?

I would say the answer is: "It depends."


The battery will sit between the frame rails. If something damages the battery from a side impact it means that energy went through the frame first so the whole vehicle is probably totaled anyways.

 

[J Alynn]

I would say the answer is: "It depends."


The battery will sit between the frame rails. If something damages the battery from a side impact it means that energy went through the frame first so the whole vehicle is probably totaled anyways.

Good point!

 

[oldgeeksguide]

Interestingly a lot of EVs use at least one set of drum brakes, partly because the regenerative braking means you use your brakes leas often and drum brakes are better protected against the elements. I presume the drum brakes are used for the e-brake as well.

On my VW ID.4 the drum brakes result in some interesting braking behaviors and even less even braking at the end of a stop. It doesn’t really bother me, but it is interesting.

There is a great you tube video on this here:

Personally I like this. VWs MEB platform is the only one I know that uses drum brakes. And it’s only in the rear, the front brakes still have disks. Seems like a good trade off, when a lot of braking is from regen anyway.