brycenesbitt
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Joined: Sun Jan 31, 2016 8:48 pm
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Is it possible to adjust transition from regen to friction brake (lurch during an otherwise smooth stop with 2011 Leaf)

Mon May 20, 2019 12:13 pm

I have a 2011 Leaf, and more and more, I can detect the switch from regeneration to friction braking.

This leaf only sees city duty, due to a worn out battery at 37000 miles. I normally coast in neutral between lights, then switch to ECO/B mode, then as needed apply the brakes. This is all smooth. But at some point near 4-5 mph there's a grab, which I interpret as the friction brakes kicking in.

Is there a way for a qualified mechanic to adjust the switchover point, and make the braking smooth again?
Last edited by brycenesbitt on Mon May 20, 2019 10:52 pm, edited 1 time in total.

cwerdna
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Re: Is it possible to adjust transition from regen to friction brake (lurch during an otherwise smooth stop with 2011 Le

Mon May 20, 2019 12:22 pm

B mode? I thought that didn’t arrive until ‘13 SV and SL.

'19 Bolt Premier
'13 Leaf SV w/premium package (owned)
'13 Leaf SV w/QC + LED & premium packages (lease over, car returned)

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

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Nubo
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Re: Is it possible to adjust transition from regen to friction brake (lurch during an otherwise smooth stop with 2011 Le

Mon May 20, 2019 5:41 pm

brycenesbitt wrote:IBut at some point near 4-5 mph there's a grab, which I interpret as the friction brakes kicking in.

Is there a way for a qualified mechanic to adjust the switchover point, and make the braking smooth again?
Your LEAF might benefit from re-calibrating the brake control unit. Bring the vehicle to a stop, and hold the brake pedal all the way to the floor, and keep it there for a full 30 seconds. You may find your braking smoother after that.
I noticed you're still working with polymers.

GerryAZ
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Re: Is it possible to adjust transition from regen to friction brake (lurch during an otherwise smooth stop with 2011 Le

Mon May 20, 2019 6:07 pm

2011 did not have B mode, just D and ECO. The "recalibration" that Nubo suggested may help. There were also a couple other brake "recalibration" procedures that the early adopters discovered, but it has been too long since the 2011 was totaled so I cannot remember them (but I remember that they did improve the issue you describe). Try searching the forum.
Gerry
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015; traded 8/10/2019 at 82,436 miles
White LEAF 2019 SL+ purchased 8/10/2019

BrockWI
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Leaf Number: 423875
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Re: Is it possible to adjust transition from regen to friction brake (lurch during an otherwise smooth stop with 2011 Le

Tue May 21, 2019 6:33 am

Stole from another thread, but it works for me, I do this about once a month.
Grabby at high or low speeds? There's a (temporary?) fix if it happens at low, which is: Turn off traction control, inch forward, hold and press down the brakes FULLY for about 30 seconds. That's it. Mine used to be super grabby on/off style at low speeds, but now they're normal.
3 kw solar pv - XW6048 - eight L16's
4 ton GSHP - 1 ton ASHP
2003 VW TDI 200k miles - 52 mpg lifetime
EVSE level 2 - Clipper Creek HSC-40
2013 S model with QC package Mar of 2013
lost first bar @ 72k
@90k miles - 54.71Ahr - 83.64SOH - 78.44Hx - 237GID

brycenesbitt
Posts: 112
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Re: Is it possible to adjust transition from regen to friction brake (lurch during an otherwise smooth stop with 2011 Le

Sun May 26, 2019 10:24 pm

So I did that.
Now as I come to a stop, when the car surges forward slightly at the transition point.
So rather than grabby, it's loosey. Kinda disturbing, but at least it is short.

BrockWI
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Re: Is it possible to adjust transition from regen to friction brake (lurch during an otherwise smooth stop with 2011 Le

Mon May 27, 2019 6:33 am

Yes it does that at first, then slowly will go back to the grabby point. Just making sure you not at 92%'ish percent full (or more) at the same time? If so you loose a lot of the regen braking then I notice more of that missing point in the center of the brake pedal.
3 kw solar pv - XW6048 - eight L16's
4 ton GSHP - 1 ton ASHP
2003 VW TDI 200k miles - 52 mpg lifetime
EVSE level 2 - Clipper Creek HSC-40
2013 S model with QC package Mar of 2013
lost first bar @ 72k
@90k miles - 54.71Ahr - 83.64SOH - 78.44Hx - 237GID

69800
Posts: 146
Joined: Fri Dec 30, 2011 2:21 pm
Delivery Date: 03 Jan 2012
Leaf Number: 16583
Location: North Idaho

Re: Is it possible to adjust transition from regen to friction brake (lurch during an otherwise smooth stop with 2011 Le

Thu Jul 25, 2019 1:47 pm

My 2012 has gotten worse each year mainly in cold weather. I had not seen the post so I have not tried the hold brake trick. But I just put new rotors on and new brake fluid. Pads were still at 70% so I left them on. 54000 mile on the car.
Stops smooth as soft ice cream. figure that one out....

my car does not have any update. has never been to the dealer since new
2012 SV Delivered Jan 2012
DOM 10/11 Sequence 16583
28000 miles. Never updated.
Leaf Spy Pro Ah-60.09/ SOH-91%/Hx-89.61

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Nubo
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Location: Vallejo, CA

Re: Is it possible to adjust transition from regen to friction brake (lurch during an otherwise smooth stop with 2011 Le

Thu Jul 25, 2019 4:34 pm

69800 wrote:
Thu Jul 25, 2019 1:47 pm
My 2012 has gotten worse each year mainly in cold weather. I had not seen the post so I have not tried the hold brake trick. But I just put new rotors on and new brake fluid. Pads were still at 70% so I left them on. 54000 mile on the car.
Stops smooth as soft ice cream. figure that one out....

my car does not have any update. has never been to the dealer since new
Just speculating but perhaps procedure followed to purge/bleed the brakes might have served as a recalibration event.

I'm curious, why were the rotors no longer serviceable?
I noticed you're still working with polymers.

ddh1313
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Re: Is it possible to adjust transition from regen to friction brake (lurch during an otherwise smooth stop with 2011 Le

Mon Jul 29, 2019 11:12 am

Yep, adds up to me. Traditional hydraulic brakes also get more difficult to modulate by human foot as the rotors get out of spec.
EV, ICE, Amtrak passenger car... rotors go bad.

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