mkjayakumar
Posts: 1219
Joined: Thu Mar 08, 2012 9:13 am
Delivery Date: 08 Mar 2012
Location: Plano, TX

Re: Car moves while I am pressing on the brake.

Fri Sep 19, 2014 1:45 pm

Modern cars take time to show animations of the maker logo on the dash, play soothing sounds and all sorts of other crap
When are they going to start peddling ads ?
2011 Leaf, 30K miles, returned after 24 month lease.
Currently leasing 2014 Leaf SV.

daryler
Posts: 6
Joined: Fri Sep 19, 2014 10:26 am
Delivery Date: 07 Sep 2014
Leaf Number: 302516

Re: Car moves while I am pressing on the brake.

Fri Sep 19, 2014 1:54 pm

Yes, on level ground. I think the key to getting this to happen is releasing the emergency brake while it is starting. If I start the car and wait a few seconds and then release the emergency brake, this does not happen.

billg
Posts: 195
Joined: Thu Jul 24, 2014 9:57 am
Delivery Date: 05 Aug 2014
Location: DFW, TX

Re: Car moves while I am pressing on the brake.

Fri Sep 19, 2014 1:58 pm

daryler wrote:Yes, on level ground. I think the key to getting this to happen is releasing the emergency brake while it is starting. If I start the car and wait a few seconds and then release the emergency brake, this does not happen.
The obvious solution, since this is on level ground, is to stop using the emergency brake. I know that sounds flippant, but I've had the car for 6 weeks and have never used the emergency brake. I don't even know where it is! Why do you use it?

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RegGuheert
Posts: 6419
Joined: Mon Mar 19, 2012 4:12 am
Delivery Date: 16 Mar 2012
Leaf Number: 5926
Location: Northern VA

Re: Car moves while I am pressing on the brake.

Fri Sep 19, 2014 4:15 pm

NasGoreList wrote:sounds like brake booster vacuum leak...
There is no vacuum in the brake system in the LEAF. Boost is done using an electric pump which runs off the 12V electrical system. Perhaps the battery has a problem...
RegGuheert
2011 Leaf SL Demo vehicle
10K mi. on 041413; 20K mi. (55.7Ah) on 080714; 30K mi. (52.0Ah) on 123015; 40K mi. (49.8Ah) on 020817; 50K mi. (47.2Ah) on 120717; 60K mi. (43.66Ah) on 091918.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

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Nubo
Posts: 5800
Joined: Fri May 28, 2010 11:01 am
Delivery Date: 31 Oct 2014
Location: Vallejo, CA

Re: Car moves while I am pressing on the brake.

Fri Sep 19, 2014 4:27 pm

2k1Toaster wrote:What you describe sounds like you are putting it in neutral. I've done it a few times, on both the Leaf and the Prius. On a simpler car you can start it and if it is already in gear like a manual, be reversing away before the radio starts playing. Modern cars take time to show animations of the maker logo on the dash, play soothing sounds and all sorts of other crap, but that takes time.
I think there is actually some important stuff going on, like self-checks and pre-charging of capacitors... :)
I noticed you're still working with polymers.

billg
Posts: 195
Joined: Thu Jul 24, 2014 9:57 am
Delivery Date: 05 Aug 2014
Location: DFW, TX

Re: Car moves while I am pressing on the brake.

Fri Sep 19, 2014 5:22 pm

billg wrote:The obvious solution, since this is on level ground, is to stop using the emergency brake. I know that sounds flippant, but I've had the car for 6 weeks and have never used the emergency brake. I don't even know where it is! Why do you use it?
OK, I found my emergency brake and I think I followed your routine. My car did not start moving when I put it in reverse and maintained light pressure on the brake pedal after releasing the emergency brake.

I believe you have a problem that should be addressed by the dealer.

daryler
Posts: 6
Joined: Fri Sep 19, 2014 10:26 am
Delivery Date: 07 Sep 2014
Leaf Number: 302516

Re: Car moves while I am pressing on the brake.

Mon Sep 29, 2014 6:46 am

Wanted to give everyone an update on my issue. Before I could take it to the dealer, I arrived at work last Wednesday and parked it with 80% charge. When I tried to start the car at lunch, it gave me an error on the computer screen "T/M System Malfunction Visit Dealer" The car would not start or allow me to put it in neutral. Called Nissan Roadside Assistance. They towed it to the dealer. Apparently the 12v battery was bad. They replaced the battery and now I don't have an issue anymore. The car does not do all the things I mentioned at the beginning of this post.

The thing I found surprising is that I have only had the car two and half weeks and the battery is already dead. I asked if me having the GPS plugged into the Cigarette lighter along with an Ipod plugged into the USB port would have caused it. They said no, just one of those things were I had a bad battery. Glad it was under warranty.

Wonder why the Lithium Ion Battery can't provide power to the 12v battery to at least let me put the car into neutral or drive it to the dealership? I have read other post where people had to have the car towed due to a dead 12v battery.

bbrowncods
Posts: 187
Joined: Fri Jun 06, 2014 8:53 pm
Delivery Date: 09 Jun 2014
Leaf Number: 339458
Location: Norfolk VA

Re: Car moves while I am pressing on the brake.

Mon Sep 29, 2014 9:45 am

My '14 had a bad battery at 7 weeks. One of the cells had 0 volts. I think there is a rash of bad batteries from the factory. The dealer replaced it with an 84 month battery. We'll see how long it lasts.
2014 Cayenne Red Leaf SL purchased 6/9/2014 (dealer received it on 6/7/2014), manufacture date 4/2014.
7/4/14 -629 miles, Temp 83, SOC 97.5, 59.81 Ahr, SOH 91%, Hx 91.44, 20.2 Kwh, Avg 4.127, High 4.136, Low 4.122, GIDS 267/92.5%.

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dgpcolorado
Posts: 3165
Joined: Sat Aug 20, 2011 1:56 pm
Delivery Date: 15 Dec 2011
Location: The Western Slope, Colorado

Re: Car moves while I am pressing on the brake.

Mon Sep 29, 2014 12:45 pm

daryler wrote:...Wonder why the Lithium Ion Battery can't provide power to the 12v battery to at least let me put the car into neutral or drive it to the dealership? I have read other post where people had to have the car towed due to a dead 12v battery.
The traction battery is disconnected while the car is off to protect it. The 12 V system is used to close the contacts to put the traction battery in service. The LEAF can be jumped with another car to start it in the case of 12 V battery failure, and it should drive normally until turned off again; there are several threads on the subject of jumping.
Blue 2012 SV Dec 2011 to Feb 2016
CPO 2014 Tesla S60 Mar 2016
One car, no ICE, at last!

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RegGuheert
Posts: 6419
Joined: Mon Mar 19, 2012 4:12 am
Delivery Date: 16 Mar 2012
Leaf Number: 5926
Location: Northern VA

Re: Car moves while I am pressing on the brake.

Mon Sep 29, 2014 2:40 pm

daryler wrote:Apparently the 12v battery was bad.
As predicted.

I'm convinced that the 12V battery is the first thing to check on the LEAF when there are braking issues, particularly if codes are being thrown. In this case, it was likely just a bad battery, but the poor 12V charging algorithm in the LEAF conspires with the extreme sensitivity of the braking system to 12V-system voltage to make this a potentially severe issue as these batteries age. I suppose things are O.K. as long as a cell does not fail shorted...
RegGuheert
2011 Leaf SL Demo vehicle
10K mi. on 041413; 20K mi. (55.7Ah) on 080714; 30K mi. (52.0Ah) on 123015; 40K mi. (49.8Ah) on 020817; 50K mi. (47.2Ah) on 120717; 60K mi. (43.66Ah) on 091918.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

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