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Brakes grabbing (last 15 feet)


GKB1000
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Anyone having problems with their fusion energi's brakes grabbing in wet weather. My 2014 has 3500 miles on it and it started to grab. It only grabs when wet and on the final bit of stop. Seems like it only does it when car is under 10 mph. It slows down fine then grabs at the last moment. I assume it has something to do with transition from regen to normal braking.

 

Thanks

 Greg B

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I think that this has to do with the brakes actually engaging (verses the transmission slowing the car). The rotors are going to have moisture and possibly even rust on them the first time they are engaged. I am surprised by the 15 foot comment though... or does that mean that the brakes feel different in the last fifteen feet?

 

The ABS should only kick in if there is ice, oil, or you are hydroplaning (basically one of the wheels are in free spin). Probably not something that is happening in just the last 15 feet and especially if you have been in a controlled stop until then.

 

I have issues backing this car up as I am always expecting the car to brake similar to what it does moving forward. But I think that the car always applies the physical brakes in reverse. One nice thing about that behavior is that it is cleaning the rotors as I back out of a parking space or the garage -- reducing the possibility of this slipping when the brakes engage next time. 

 

All of this is just a guess on my part as I do not know how Ford has implemented this system... just how it seems to be working for me.

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  • 7 months later...

I also have noticed this.  Have just over 1000 miles on the car.  Anyone find a solution to the problem.

It isn't a problem. All cars with brake pads & rotors have changed braking feel when the pads and wet. In a non-hybrid your pads get hot very quickly and thus dry out quickly. In a hybrid your pads stay wet longer due to regen braking.

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  • 3 weeks later...

When you slow down beyond 5mph in D or 2.5mph in L, regen ends and the friction brakes grab.  There is NO regen below these speeds.

 

I regen all the time 100% most of the time and as I'm slowing up I let up on the brakes just slightly to use all the remaining distance in front of me and regen longer.  When the car's speed falls to 5mph in D, I hear the scrape of the brake pads as the car transitions from regen to friction braking.

 

This may be what you're experiencing.  Try to let up just a little and extend the glide further, you may be trying to stop harder and that's why they seem to grab when they transition.

 

-=>Raja.

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  • 2 weeks later...

There was another thread that had a video in it, while backing up there was a substantial pop/thunk.

 

After paying more attention, I have noticed this noise, but not nearly as loud as what the video sounded like (though it could be the condition of being recorded in a garage which contained the sound compared to me being outside.

 

My theory is, this is just the brake pads shifting from forward braking to rearward braking. Brake pads are floating, so they can shift ever so slightly on their end supports (brakes). My suspicion is all cars do this, but since your engine isn't running to mask the sound, we notice it more. Maybe this isn't true at all, but what I hear isn't loud enough for me to be concerned with.

I would think someone could test this (I am to lazy), but parking there car after then have gone backward a few feet with the brakes dragging, park overnight, then in the morning listen for the thud.

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