finman100
Posts: 328
Joined: Thu Sep 20, 2012 10:42 am
Delivery Date: 06 Jun 2014
Location: Albany, OR

Re: Grabby Brakes?

Wed Aug 20, 2014 4:03 pm

no grabby brakes here. 2014 SV with 4400 miles. B mode definitely will "grab" more than D, but it is all smooth down to a stop. no panic stops yet, so can't report that experience. Drove an '04 Prius for 10 years and the Leaf seems to blend braking better (friction and regen). Prius would be all regen down to 12 MPH, then 'grabby' friction brakes, especially in the rain. Leaf, not so much. much better feel and evenness.
Albany, Oregon
2014 Silver SV with charge/LED package. June 2014, I'm in the EV game!
46,000 miles
17.5 kWh on 100% charge (51-ish Ah), down 1 bar
4.2 miles/kWh average
Best trip: all of 'em. They're all no-gas!

LaFeuille
Posts: 4
Joined: Tue Oct 14, 2014 8:36 pm
Delivery Date: 14 Oct 2014
Leaf Number: 017677

Re: Grabby Brakes?

Wed Oct 15, 2014 2:50 pm

QueenBee wrote:
rlewis123 wrote:That is too bad. The problem seems to be the brakes grab or they stop working and the car wants to coast into intersections. A real safety issue for sure because you can't modulate the brakes. It does it the same in any combination of ECO, D or B settings.
The brakes being grabby is a completely different issues than the brakes not working...
Not realty, because the computer runs everything....

LaFeuille
Posts: 4
Joined: Tue Oct 14, 2014 8:36 pm
Delivery Date: 14 Oct 2014
Leaf Number: 017677

Re: Grabby Brakes?

Wed Oct 15, 2014 3:02 pm

kubel wrote:Anyone else experience pulsing brakes when using consistent brake pressure after the brake update? It's as if the brakes start to grab, then the car lets go slightly, then they grab, etc... Happens about twice per second in a rhythm (fixed just like grabby brakes, completely let off brake, then press brake and problem is gone). It's not violently pulsing, and there's no feedback in the pedal. I've added it to my list of things to fix when I go in for my battery check (aka driver check) next month, just curious if anyone else has experienced this.
Yes it appended to me about 10 times in 46 000 km, ....Nissan mecanics always say that the car is just fine and that I have to get used to drive a Leaf ??? after 46 000km. I hope Nissan gets serious about it pretty soon.

LaFeuille
Posts: 4
Joined: Tue Oct 14, 2014 8:36 pm
Delivery Date: 14 Oct 2014
Leaf Number: 017677

Re: Grabby Brakes?

Wed Oct 15, 2014 3:21 pm

cdrews wrote:It would be useful if people that experience the grabby brakes file a complaint with the NHTSA. That way a record exists of how serious and widespread this problem is. This also might create additional motivation for Nissan to work towards a fix.

The website to file a complaint is here:
https://www-odi.nhtsa.dot.gov/ivoq/" onclick="window.open(this.href);return false;

-= Clemens
That's what I'm gone do, in Canada. I went to the dealer 3 times and called Nissan Canada 4 times and nothing append....I am desperate, the next step is to return the vehicule.

LaFeuille
Posts: 4
Joined: Tue Oct 14, 2014 8:36 pm
Delivery Date: 14 Oct 2014
Leaf Number: 017677

Re: Grabby Brakes?

Wed Oct 15, 2014 3:30 pm

poolrider wrote:It's been two weeks since i contacted Nissan about my brake problems and have gotten no reply or updates. They were supposed to send an engineer to the dealership to discuss it with them, but they never did. I'm really disappointed with them. You still having issues with your brakes? I am.
Same for me.
My first visit was 4 months ago. Still nothing done. Nissan don't take care mush. All the problems like grabby brakes, extremely sensitive brakes and pulsing brakes I have them all... . I live in Canada, so I am calling Transport Canada. Hoping Nissan get responsible and act on it.

kubel
Posts: 1609
Joined: Mon Feb 13, 2012 11:38 am
Leaf Number: 19628
Location: Southeast Michigan

Re: Grabby Brakes?

Wed Oct 15, 2014 3:57 pm

There are different "grabby brake" issues, which I believe are all areas that lack programming refinement:

1) Brake Assist
LEAF features Brake Assist, which will increase brake pressure when it detects a panic brake attempt by the driver. This can cause the brakes to grab hard and not let go even when you release the brake. It's designed to bring the car to a complete stop since drivers tend to not apply full pressure on the brakes in an emergency where they should. This is an annoying feature, and it can sometimes activate when you don't mean for it to. Fully releasing the brake and pressing the accelerator will stop Brake Assist.

2) Grabby Brakes
Unusually touchy brakes, usually when you're riding your brake such as in traffic conditions, tends to happen in cooler temperatures. It's probably a glitch in regen programming. Workaround: Fully lift off the brake pedal and then re-apply the brakes always fixes the problem until your next braking event.

3) Pulsing Brakes
Touchy/sensitive for one half a second, normal for another half second- repeats. This pulsing can be corrected the same way a grabby brake can be corrected- fully lift off the brake pedal and reapply the brakes.

Then there's the sort of unrelated "ungrabby brakes". If braking while hitting a sharp bump in the road / pothole, anti-lock braking may kick in, significantly reducing braking pressure in one or more wheels, usually at the worst possible time such as slowing while approaching stopped traffic. All anti-lock brake cars do this to some extent, but LEAFs system is overly aggressive (this becomes incredibly apparent in winter weather conditions when roads are slippery- the car will aggressively anti-lock- to the point of making the car unsafe).
2012 Nissan LEAF SV
20% degradation in 42k miles
Leased 5-17-2012, Returned 1-15-2016


2017 Chevy Volt LT
Siren Red Tintcoat
Leased 10-21-2016

TimLee
Posts: 2811
Joined: Thu Jan 20, 2011 9:40 am
Delivery Date: 17 May 2011
Leaf Number: 2026
Location: Chattanooga, TN

Re: Grabby Brakes?

Wed Oct 15, 2014 4:12 pm

^Excellent summary kubel.
All are defects that create unnecessary risk and hazard. Nissan should fix all of them.

Tim Lee
Chattanooga, TN

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

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ksnogas2112
Posts: 1218
Joined: Mon Apr 16, 2012 7:56 pm
Delivery Date: 23 Jun 2012
Leaf Number: 021881
Location: Lenexa KS (Kansas City)
Contact: Website

Re: Grabby Brakes?

Thu Oct 16, 2014 10:29 am

Just throwing this out .... had grabby brakes a lot more during the second year than in the first. Got brand new Goodyear Fuel Max tires 2 weeks ago and expected grabby brakes in the cool rain which has typically been happening. It didn't happen. Obviously there is some level of environmental influence on the problem that can't be explained (yet). It is going to be interesting to see what happens when it gets cold. Especially if the rest of the KC crew sticks with the OEM Ecoppias while I'm on the Goodyear's. And yes, I know it sounds stupid to say tires are affecting brakes. One reason why I hesitated for 2 weeks on posting.
Tom in KS
100 Mile Club-#57
http://ksnogas.blogspot.com/
Try reading a book, it's a novel experience
MY 2012 - Cayenne Red-55,000+ miles

User avatar
dgpcolorado
Posts: 3129
Joined: Sat Aug 20, 2011 1:56 pm
Delivery Date: 15 Dec 2011
Location: The Western Slope, Colorado

Re: Grabby Brakes?

Thu Oct 16, 2014 11:16 am

ksnogas2112 wrote:...Got brand new Goodyear Fuel Max tires 2 weeks ago...
Do you have a sense of any difference in noise with the Goodyear tires? I read a number of reviews that said they were noisy and if drivers think that with ICE cars, it might be pretty significant on a very quiet LEAF. So, I've been wondering what LEAF drivers with Goodyear Fuel Max tires think.
Blue 2012 SV Dec 2011 to Feb 2016
CPO 2014 Tesla S60 Mar 2016
One car, no ICE, at last!
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User avatar
ksnogas2112
Posts: 1218
Joined: Mon Apr 16, 2012 7:56 pm
Delivery Date: 23 Jun 2012
Leaf Number: 021881
Location: Lenexa KS (Kansas City)
Contact: Website

Re: Grabby Brakes?

Fri Oct 17, 2014 8:29 am

dgpcolorado wrote:
ksnogas2112 wrote:...Got brand new Goodyear Fuel Max tires 2 weeks ago...
Do you have a sense of any difference in noise with the Goodyear tires? I read a number of reviews that said they were noisy and if drivers think that with ICE cars, it might be pretty significant on a very quiet LEAF. So, I've been wondering what LEAF drivers with Goodyear Fuel Max tires think.
The only extra noise I can report is with the windows down you can hear the tread when turning the corner at slow speed. But I would expect that with any new tire and it's only when turning corners or going slowly in parking lots. It does feel a little slower on acceleration but coasting feels like it goes much further than before. Best of all is the peace of mind in having new tread. The old ones were so thin that I was worried I would pop a tire on the gravel roads when camping.
Tom in KS
100 Mile Club-#57
http://ksnogas.blogspot.com/
Try reading a book, it's a novel experience
MY 2012 - Cayenne Red-55,000+ miles

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