borugee
Posts: 50
Joined: Fri Sep 15, 2017 8:06 pm
Delivery Date: 18 Mar 2018
Location: Dallas TX

2018 Leaf Loosing Brake when road has bumps / pot-holes?

Tue May 08, 2018 10:35 pm

I have encouted this couple of times now during 2000 miles of usage. Both times this what I experienced. Was driving at around 45MPH. Apply medium brake enough to stop in about 200ft from 45MPH, while applying brakes if a wheel go over a some bumps (of around 1 inch high) suddenly you will find the car moving without brakes, and brake padel dropping about 1 inch. You need to press hard on padel to gain control / brakes again. At one time I saw a message on dash which quickly disappeared. I think it read "NOT AVAILABLE". (I may be wrong it may have had additional words, I couldn't read this as I was in a panic and applying brakes). It is possible, that REGEN brake give up due to bad road condition and brake pedal dropped down.

I think you loose about 1 second without brakes before you gain brakes back, which could end up in an accident ? This is a safety concern for me. I took car to dealer, and they said everything is normal. It is not easy to reproduce this condition either.

Anyone else had similar experiance? Would like to know?
Borugee
2018 SL ; 03/18 Delivery ; Dallas TX ; @10k Mile ; SOH=94.83,AHr=109.47,Hx=109.12

LeftieBiker
Posts: 9841
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: 2018 Leaf Loosing Brake when road has bumps / pot-holes?

Tue May 08, 2018 10:48 pm

This is the ABS in action. It's disconcerting, but all Leafs do it, and all Priuses, at least from the Gen III on, and it isn't as dangerous as it seems. They just have it programmed a little aggressively. There is already a topic or two on this.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

2k1Toaster
Posts: 483
Joined: Mon Nov 18, 2013 5:45 pm
Delivery Date: 12 Nov 2013
Leaf Number: 420903

Re: 2018 Leaf Loosing Brake when road has bumps / pot-holes?

Wed May 09, 2018 6:22 am

When the traction control kicks in, regen braking disables. This is how all vehicles with regenerative braking work. There are lots of posts with the Prius because that was many people's first insight into regenerative braking driving.

What you're feeling is not a loss of braking. It is a loss of deceleration or jerk. Humans just suck at feeling this, but very easy to see if you have accelerometer data.
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powersurge
Posts: 1127
Joined: Wed Oct 21, 2015 10:24 am
Delivery Date: 06 Dec 2014
Location: Long Island, NY

Re: 2018 Leaf Loosing Brake when road has bumps / pot-holes?

Wed May 09, 2018 6:40 am

This is not a problem, but the high tech braking computer doing its job.

Going over bumps really makes the computer go crazy because the traction control engages.

In the winter you can play with it on ice to see how it works.... just stomp your foot on the brake and hold it. and feel the pumping action.

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