DarkStar
Posts: 2066
Joined: Sat Jul 17, 2010 10:06 am
Delivery Date: 25 Mar 2011
Leaf Number: 568
Location: Hillsboro, Oregon, USA
Contact: Website

Re: Electric parking brake switch

Tue Aug 05, 2014 11:09 am

Nubo wrote:On the other hand, it is not as utilitarian; you can't do a handbrake turn, for example ;)

...and here's the video:

https://www.youtube.com/watch?v=cU3K-hqjD1A
Mikiko (2011 Nissan LEAF ETEC) Status:
Reserved: 04/20/10 | Ordered: 10/01/10 | EV Project Blink Installed: 03/22/11 | Delivered: 03/25/11 | VIN: 568

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TomT
Posts: 10565
Joined: Sun Aug 08, 2010 12:09 pm
Delivery Date: 01 Mar 2011
Leaf Number: 000360
Location: Foothills of Granada Hills, CA
Contact: Website

Re: Electric parking brake switch

Tue Aug 05, 2014 11:48 am

The 2011 and 2012 had both. The standard parking pawl on the gear box for the front wheels, and an electric parking brake on the rear wheels. In 2013 the electric parking brake was replaced with one that was mechanically operated.

I much prefer the electric one and suspect the change was done to cut costs...

mctom987 wrote:AFAIK, no vehicle in the world has an electric parking brake. This is just ultimately doomed to fail.
59,991 miles/12 bars/289 Gids/68.54 AHr/101% SOH/101.64% Hx 7May15 w/ new Lizard (barely made the warranty).
71,770 miles/12 bars/256 Gids/59.04 AHr/88% SOH/87.92% Hx 3Mar16 at lease return.

Now driving a 2016 Volt Premier. Model 3 reserved.

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TomT
Posts: 10565
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Delivery Date: 01 Mar 2011
Leaf Number: 000360
Location: Foothills of Granada Hills, CA
Contact: Website

Re: Electric parking brake switch

Tue Aug 05, 2014 11:50 am

Yep, I've never heard of any problems with it either but, ironically, there have been some with the replacement mechanical version...

gbarry42 wrote:If you look back to the posts from 2011, you'll find that most people thought the electric mechanism was overly complicated and bound to fail. Well, in this sample of 1, I've used it every time I move the car, and there have been no issues.
59,991 miles/12 bars/289 Gids/68.54 AHr/101% SOH/101.64% Hx 7May15 w/ new Lizard (barely made the warranty).
71,770 miles/12 bars/256 Gids/59.04 AHr/88% SOH/87.92% Hx 3Mar16 at lease return.

Now driving a 2016 Volt Premier. Model 3 reserved.

Websterize
Posts: 11
Joined: Mon Jul 21, 2014 7:18 pm
Delivery Date: 21 Jul 2014
Location: Maryland, USA

Re: Electric parking brake switch

Tue Aug 05, 2014 12:41 pm

For the most part, I love the look and feel of the Leaf, so the mechanical foot brake is kinda anathema to the whole high-tech shtick that Nissan markets. The brown shoes with a tuxedo quote comes to mind. :D

I’m also alarmed by the idea of what that anachronistic lever in the footwell (or anything down there, really) would do to my left leg in a 40-mph, small overlap front collision. This is a distressing photo by IIHS:

Image

http://www.iihs.org/iihs/ratings/vehicle/v/nissan/leaf
Bill | 2014 Leaf SL alumnus

Websterize
Posts: 11
Joined: Mon Jul 21, 2014 7:18 pm
Delivery Date: 21 Jul 2014
Location: Maryland, USA

Re: Electric parking brake switch

Tue Aug 05, 2014 1:30 pm

Fascinating details on how IIHS conducts its frontal crash tests and why the Leaf faired so poorly in one of them:

Small overlap frontal crashes primarily affect a vehicle's outer edges, which aren't well protected by the crush-zone structures. Crash forces go directly into the front wheel, suspension system and firewall. It is not uncommon for the wheel to be forced rearward into the footwell, contributing to even more intrusion in the occupant compartment and resulting in serious leg and foot injuries. To provide effective protection in small overlap crashes, the safety cage needs to resist crash forces that aren't tempered by crush-zone structures. Widening these front-end structures also would help.


One would hope this new rating, and CR's response, will spark a resolution from Nissan headquarters.

http://www.iihs.org/iihs/ratings/rating ... rash-tests
Bill | 2014 Leaf SL alumnus

mctom987
Posts: 333
Joined: Wed Jun 25, 2014 6:52 pm
Delivery Date: 29 May 2014
Leaf Number: 332755
Location: San José

Re: Electric parking brake switch

Tue Aug 05, 2014 2:49 pm

TomT wrote:The 2011 and 2012 had both. The standard parking pawl on the gear box for the front wheels, and an electric parking brake on the rear wheels. In 2013 the electric parking brake was replaced with one that was mechanically operated.

I much prefer the electric one and suspect the change was done to cut costs...

mctom987 wrote:AFAIK, no vehicle in the world has an electric parking brake. This is just ultimately doomed to fail.

Are you sure it's not an electrically engaged mechanical brake? An electrical brake is dangerous, as no power = no brakes. I'm asking because there is a significant difference, and ambiguous references are only causing confusion.

I'm pretty sure the '11/'12 Leaf has a mechanical parking brake. It just had a "lazy" feature that engaged it electronically.
2014 Green Leaf SL +PP
June: 580.6 mi, 4.7mi/kWh
July: 1443.8mi, 4.8mi/kWh
Aug: 1157.9mi, 5.1mi/kWh

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TomT
Posts: 10565
Joined: Sun Aug 08, 2010 12:09 pm
Delivery Date: 01 Mar 2011
Leaf Number: 000360
Location: Foothills of Granada Hills, CA
Contact: Website

Re: Electric parking brake switch

Tue Aug 05, 2014 4:13 pm

It is an electrically operated, via motor and cable, mechanical brake on the rear wheels. There is a super capacitor that provides power to operate it for a number of cycles in the event of a total electrical failure. There is also a mechanical override to release it in the event that everything else fails. Much more elegant than the pedal system they replaced it with, but certainly more expensive...


mctom987 wrote:Are you sure it's not an electrically engaged mechanical brake? An electrical brake is dangerous, as no power = no brakes.
59,991 miles/12 bars/289 Gids/68.54 AHr/101% SOH/101.64% Hx 7May15 w/ new Lizard (barely made the warranty).
71,770 miles/12 bars/256 Gids/59.04 AHr/88% SOH/87.92% Hx 3Mar16 at lease return.

Now driving a 2016 Volt Premier. Model 3 reserved.

TimLee
Posts: 2810
Joined: Thu Jan 20, 2011 9:40 am
Delivery Date: 17 May 2011
Leaf Number: 2026
Location: Chattanooga, TN

Re: Electric parking brake switch

Wed Aug 06, 2014 10:15 am

TomT wrote:... There is also a mechanical override to release it in the event that everything else fails. Much more elegant than the pedal system they replaced it with, but certainly more expensive...


Where is the mechanical override?

Tim Lee
Chattanooga, TN

Man. Date: 03/10/11, VIN # 2026
Delivered 05-17-2011
Blue Ocean, 2011 SL-eTec

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Nubo
Posts: 4480
Joined: Fri May 28, 2010 11:01 am
Delivery Date: 31 Oct 2014
Location: Vallejo, CA

Re: Electric parking brake switch

Wed Aug 06, 2014 10:50 am

DarkStar wrote:
Nubo wrote:On the other hand, it is not as utilitarian; you can't do a handbrake turn, for example ;)

...and here's the video:

https://www.youtube.com/watch?v=cU3K-hqjD1A


Bravo! I stand corrected! :D
I noticed you're still working with polymers.

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dgpcolorado
Posts: 2965
Joined: Sat Aug 20, 2011 1:56 pm
Delivery Date: 15 Dec 2011
Location: The Western Slope, Colorado

Re: Electric parking brake switch

Wed Aug 06, 2014 11:43 am

TimLee wrote:Where is the mechanical override?
The electric parking brake override is in the floor of the trunk. If used, the manual says that it will need to be taken to a dealer to be reset. The override is to allow release of the parking brake in the event of an electric systems failure or something similar (the brake switch on the console stops functioning).

It is interesting that after several years of use in the 2011/2012 LEAFs I can't recall a single report here at MNL of the electric parking brake failing or needing service. That was my main reservation: another electric gadget to break. Turns out that it is very reliable and easy to use.
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