Pg3ibew Posted December 26, 2016 at 11:22 PM Report Share Posted December 26, 2016 at 11:22 PM My Energi is always parked outside. And I back the car out of my driveway. I have noticed, either during, or soon after, a rain, when I back out of the driveway, the brakes will squeal pretty loudly. Does anyone else notice this? Quote Link to comment Share on other sites More sharing options...
murphy Posted December 27, 2016 at 01:24 AM Report Share Posted December 27, 2016 at 01:24 AM When rotors get wet, while sitting still, they develop rust. When you move the car the brake pads have to scrape the rust off of the rotors. dnorris78 1 Quote Link to comment Share on other sites More sharing options...
Pg3ibew Posted December 27, 2016 at 10:57 AM Author Report Share Posted December 27, 2016 at 10:57 AM When rotors get wet, while sitting still, they develop rust. When you move the car the brake pads have to scrape the rust off of the rotors.Murphy, I have been driving for 30 years. While I fully understand what you are saying, maybe I didnt describe the sound properly. It is a screeching type of squeal that I have NEVER heard on any other car I have driven. I was thinking that the sound was possibly coming from something to do with the way the batteries re charge while braking. Quote Link to comment Share on other sites More sharing options...
Vintre Posted December 27, 2016 at 12:03 PM Report Share Posted December 27, 2016 at 12:03 PM Do the brakes continue to squeal or only for a short time? Vin Quote Link to comment Share on other sites More sharing options...
Pg3ibew Posted December 27, 2016 at 12:41 PM Author Report Share Posted December 27, 2016 at 12:41 PM It only does it in the rain and in reverse. Only when the car is cold. Stops after a few times. Quote Link to comment Share on other sites More sharing options...
meyersnole Posted December 28, 2016 at 05:50 PM Report Share Posted December 28, 2016 at 05:50 PM Pretty sure the car will not regen in reverse. So you are using the brakes. As Murphy states, the noise is from rust on the rotors. This system is significantly different than non hybrid cars, where the brakes are not used nearly as much. I often get a noise backing out of my driveway, but clears up quickly. And I am parked in the garage. wazer 1 Quote Link to comment Share on other sites More sharing options...
Pg3ibew Posted January 6, 2017 at 10:32 PM Author Report Share Posted January 6, 2017 at 10:32 PM Just an update on my brakes. I am pretty sure the noise is NOT from rust. I drove cor quite a few miles in the rain the other day. Parked in my driveway. Pulled out backward a half hour later and the brakes squealed. I have to ASSUME there was NO RUST on them. Quote Link to comment Share on other sites More sharing options...
Russael Posted January 7, 2017 at 06:47 PM Report Share Posted January 7, 2017 at 06:47 PM My neighbor's Escape will do that while in reverse too. It doesn't hurt anything... it's just that right amount of pressure to cause them to scream. I haven't experienced it myself though. Workarounds are simply apply more pressure to the brakes, or if it makes you completely insane, I think there are products out there that will take away brake squeal... or pull the wheel off and hit them with brake clean. It's possible some dust is in between the pads and the rotor too, causing a squeal. If you primarly regen to stop, your friction brakes are barely used. Quote Link to comment Share on other sites More sharing options...
Pg3ibew Posted January 7, 2017 at 07:24 PM Author Report Share Posted January 7, 2017 at 07:24 PM I try to brake as infrequently as possible. Coasting mostly to stops. Please explain whatbyou mean by REGEN TO STOP.Thanks. Quote Link to comment Share on other sites More sharing options...
Russael Posted January 7, 2017 at 08:21 PM Report Share Posted January 7, 2017 at 08:21 PM I assume you have your brake coach enabled. If you hit 100% on that every time you need to use your brakes to come to a complete stop, that means you stopped using regeneration rather than the friction brakes (you recaptured all the energy possible without wasting it to heat). Now, your friction brakes will grab as you slow down under 5MPH or so... I personally can feel a slight transition when this happens, so the car DOES use the friction brakes at very low speeds. But to stop the last 10 feet doesn't put much wear on your brakes at all. My cousin's Bolt will stop completely with regeneration, which is cool. Quote Link to comment Share on other sites More sharing options...
Pg3ibew Posted January 7, 2017 at 09:39 PM Author Report Share Posted January 7, 2017 at 09:39 PM (edited) I assume you have your brake coach enabled. If you hit 100% on that every time you need to use your brakes to come to a complete stop, that means you stopped using regeneration rather than the friction brakes (you recaptured all the energy possible without wasting it to heat). Now, your friction brakes will grab as you slow down under 5MPH or so... I personally can feel a slight transition when this happens, so the car DOES use the friction brakes at very low speeds. But to stop the last 10 feet doesn't put much wear on your brakes at all. My cousin's Bolt will stop completely with regeneration, which is cool.I try to hit 100 every time. Most times I hit it. My initial thoughts when I read your earlier post was, perhaps I am doing something wrong. Or perhaps there was a SWITCH to hit that would use the electric motors to stop the car. Edited January 8, 2017 at 04:43 AM by Pg3ibew Quote Link to comment Share on other sites More sharing options...
wazer Posted January 15, 2017 at 05:04 PM Report Share Posted January 15, 2017 at 05:04 PM meyersnole is correct in that the friction brakes are used 100% while in reverse, contrary to drive where regen braking is used primarily. If you're a gentle driver, the brake pads will take longer to break-in (no pun intended,) and the noises in the situations you are describing is normal. Pg3ibew 1 Quote Link to comment Share on other sites More sharing options...
Platinum15Ti Posted January 19, 2017 at 10:20 PM Report Share Posted January 19, 2017 at 10:20 PM My 2015 did it as well. It wasn't a grinding sound or a normal "getting the rust" off sound.. It was a high pitch whine or squeal. Not sure why it did it, but like you said it was only in reverse and usually after rain. Haven't noticed it on my 2017 yet. Quote Link to comment Share on other sites More sharing options...
Pg3ibew Posted January 20, 2017 at 10:57 AM Author Report Share Posted January 20, 2017 at 10:57 AM My 2015 did it as well. It wasn't a grinding sound or a normal "getting the rust" off sound.. It was a high pitch whine or squeal. Not sure why it did it, but like you said it was only in reverse and usually after rain. Haven't noticed it on my 2017 yet.Exactly!! Quote Link to comment Share on other sites More sharing options...
Timewellspent Posted January 20, 2017 at 02:24 PM Report Share Posted January 20, 2017 at 02:24 PM My 2015 did it as well. It wasn't a grinding sound or a normal "getting the rust" off sound.. It was a high pitch whine or squeal. Not sure why it did it, but like you said it was only in reverse and usually after rain. Haven't noticed it on my 2017 yet. Same! Quote Link to comment Share on other sites More sharing options...
Fusion Help Posted October 27, 2017 at 11:04 AM Report Share Posted October 27, 2017 at 11:04 AM My 2017 does the same noise. It is a vibration produced by the rear disks vibrating when very little brake pressure is applied in reverse and the % of humidity is very high. Quote Link to comment Share on other sites More sharing options...
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