MyAlias
Posts: 4
Joined: Wed Aug 11, 2010 5:17 pm

Scary braking problem

Wed Jul 13, 2011 12:06 pm

Both my wife and I have experienced a rather scary braking problem.

I had to slow down suddenly and I pressed hard on the brakes. I then let up on the brakes, but the car kept braking hard and the tires locked. Fortunately, it skidded straight ahead, but it could have gone much worse.

Clearly there is a delay in the release of the regenerative braking that is normally not a problem, but it becomes a problem when you are trying to do a controlled, hard brake.

Has anyone else experienced this problem? It has us rather nervous.

cwerdna
Posts: 11337
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: Scary braking problem

Wed Jul 13, 2011 12:09 pm

If you feel that it is a legitimate safety problem, you should file a safety complaint w/NHTSA at http://www.safercar.gov/.

'19 Bolt Premier
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Please don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

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Ready2plugin
Posts: 672
Joined: Tue Jul 27, 2010 8:08 am

Re: Scary braking problem

Wed Jul 13, 2011 12:10 pm

MyAlias wrote:Both my wife and I have experienced a rather scary braking problem.

I had to slow down suddenly and I pressed hard on the brakes. I then let up on the brakes, but the car kept braking hard and the tires locked. Fortunately, it skidded straight ahead, but it could have gone much worse.

Clearly there is a delay in the release of the regenerative braking that is normally not a problem, but it becomes a problem when you are trying to do a controlled, hard brake.

Has anyone else experienced this problem? It has us rather nervous.

I've only had to brake hard once when someone cut right in front of me in the carpool lane. My Leaf did a great job, no lockup, and released normally. Since then, I actually feel safer in my car due to the brakes then in my old Civic Hybrid.

rawhog
Posts: 457
Joined: Fri Apr 23, 2010 2:45 pm
Delivery Date: 11 Apr 2011
Leaf Number: 898
Location: Vacaville, CA

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Wed Jul 13, 2011 12:12 pm

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Last edited by rawhog on Fri Sep 09, 2011 1:42 pm, edited 1 time in total.
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davewill
Posts: 5083
Joined: Thu Mar 17, 2011 6:04 pm
Location: San Diego, CA, US

Re: Scary braking problem

Wed Jul 13, 2011 12:14 pm

rawhog wrote:Before filing complaints with government agencies, why not take it to the dealer?
Yes, immediately take it in for service. If the described scenario is accurate, something is very wrong.
2014 Rav4 EV, Blizzard Pearl White
2011 LEAF SL w/QC, Blue Ocean, returned at end of lease

palmermd
Posts: 2629
Joined: Fri Apr 23, 2010 3:19 pm
Delivery Date: 31 Mar 2011
Leaf Number: 1100011011
Location: Hermosa Beach, CA

Re: Scary braking problem

Wed Jul 13, 2011 12:33 pm

I agree with the others to take the car to the dealer to have it inspected. It seems the problem is repeatable so it should be fairly easy for them to diagnose. I don't believe it has anything to do with regen. This is my own opinion but regen does not have enough lower to lock up the wheels. You only have 30kw of power and that is just enough to slow the car, not stop it and definitely not enough to lock the wheels and cause a skid. I'd suspect a faulty hydraulic part in the braking system.

I hope they can fix it quickly so you and your wife can regain the confidence in the car that it deserves.
Last edited by palmermd on Wed Jul 13, 2011 12:56 pm, edited 1 time in total.
Michael

Leaf from 31 March 2011 - Traded 18 April 2019 for Tesla Model 3 Unicorn
Driving electric since 1996


Leaf Bar Loss

Jim66
Posts: 32
Joined: Sat Sep 18, 2010 3:27 pm
Delivery Date: 05 May 2011
Location: Carlsbad, CA

Re: Scary braking problem

Wed Jul 13, 2011 12:34 pm

This sounds like a problem with the anti-lock brakes, not regeneration. Regen doesn't have enough power to lock up the wheels; only the brake calipers can do that.
Jim W
Blue SL-e, 5/5/11

MyAlias
Posts: 4
Joined: Wed Aug 11, 2010 5:17 pm

Re: Scary braking problem

Wed Jul 13, 2011 1:13 pm

Thanks all. Very helpful. We'll take it in.

Love the car!

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TRONZ
Posts: 2240
Joined: Tue Sep 21, 2010 11:01 pm
Delivery Date: 31 Jan 2011
Leaf Number: 202
Location: Denver, CO

Re: Scary braking problem

Wed Jul 13, 2011 1:33 pm

Did you get an Anti-Lock fault light? Have your dealer check it out.

I have had one emergency stop and it was in a downpour. Amazing braking power and stability. Just about sucked our eyeballs out!
Every start, is as good as any start can ever be. - Douglas Darden

Stats;
2011 LEAF SL VIN#202, Delivered 01.30.11. Now, by far, the oldest LEAF in Colorado.

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LTLFTcomposite
Posts: 4780
Joined: Fri Apr 23, 2010 6:06 pm
Delivery Date: 10 Dec 2011
Leaf Number: 5926
Location: Central FL

Re: Scary braking problem

Wed Jul 13, 2011 2:23 pm

rawhog wrote:Before filing complaints with government agencies, why not take it to the dealer?
What is the purpose of the safercar.gov thing? To provide a means to escalate safety concerns not resolved by the dealer/mfr or to provide an independent data collection point to gather information about safety concerns people have with particular models?

Just about everyone knows how frustrating it can be to pull up in the service dept and tell them about an intermittent problem. Who knows maybe 5% of Leaf owners are experiencing this problem (not likely given this forum) and individual service departments are shrugging it off since no problem is apparent, and nobody is catching that data.
LTL
White 2012 SV delivered 10 Dec 2011 returned 25 Nov 2014 replaced with stopgap ICE Sentra
[35 months] [35K miles] [9 Bars]
2013 Volt replaced after 36 months/30k miles with ICE Rogue
2016 SV-adjacent May 2016 lost 4th bar March 2018

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