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Screeching scraping sound when braking/decelerating and turning


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9 replies to this topic

#1 OFFLINE   pknorton

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Posted 10 November 2016 - 05:58 PM

We just bought a 2013 c-max energy yesterday with 22,000 miles and it makes a screeching scraping sound when you slow down, brake and it might be worse when turning. I am waiting to hear back from dealer but just wondering if anybody has any thoughts?







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#2 OFFLINE   fotomoto

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Posted 10 November 2016 - 06:32 PM

Hello and :welcome: 

 

 

Brakes can make noise for many reasons but hybrids add an extra scenario due to their regeneration abilities.  Regen braking is actually done by an electric motor used it against itself turning it into a generator of electricity that is fed back into the battery (COOL!).  This also slows the car down without using the traditional friction brake pads and rotors.  Unused or lightly used rotors develop surface rust in humid and/or cool conditions and can squeal upon initial use.  This can also make for a grabby/abrupt feeling even under light pedal application.   Try driving at higher speeds and brake hard then see if the brakes still squeal on the next application.



#3 OFFLINE   RubyMax

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Posted 11 November 2016 - 07:35 AM

We just bought a 2013 c-max energy yesterday with 22,000 miles and it makes a screeching scraping sound when you slow down, brake and it might be worse when turning. I am waiting to hear back from dealer but just wondering if anybody has any thoughts?

 

You've just met your friction brakes,  "Hello friction brakes, nice to hear you" :happy feet: 



#4 OFFLINE   S70Pilot

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Posted 11 November 2016 - 10:59 AM

Ditto to the comments above.. cause the brakes are seldom used (regen braking), water and moisture caused the brake to rust a bit.  Also, coupled with the quietness of the car under EV, every other sounds becomes magnified.   Yes I hear those sounds too, usually when I parked the car overnight and the first few hundred meters after I start to drive the car in the morning.  After the car brakes a few times (hard) the sound is gone (likely due to clearing out of moisture and rust)



#5 OFFLINE   rbort

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Posted 11 November 2016 - 01:41 PM

I'm not really sure what you guys are talking about, brakes should not be screeching and scraping.  I have my Cmax now 3 1/3 years and I never hear any loud noises when I use the brakes, and many times I use regen braking I hardly use the brake, but they do engage with every stop below 5mph.  If I want to hear them I have to turn off the radio and listen very carefully, and you can hear the car transition from regen braking to friction brake (pads) the last few feet.  That sounds like a scrape, but its very low sound you have to listen carefully to pick it up.

 

Maybe the original poster has worn pads, and they are now metal on metal hence why all the loud noises.  I would check into it.  Brakes are easy to service, you can even do it yourself if you have the will.

 

-=>Raja.


Edited by rbort, 11 November 2016 - 01:42 PM.

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#6 OFFLINE   fotomoto

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Posted 11 November 2016 - 05:12 PM

I'm not really sure what you guys are talking about, brakes should not be screeching and scraping. 

 

I've had 8 hybrids and this (cold brakes) is a well known issue specific to them.   I've also had high performance motorcycle brake pads with heavy metal content that were both noisy and caused high rotor wear rates.  

 

I didn't suggest it might be the usual brake problems/issues since the OP only has 22k miles.  



#7 OFFLINE   rbort

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Posted 11 November 2016 - 06:14 PM

Yes Doug but I have the Cmax and 57k miles later my brakes never made any noise, so something is not normal.

-=>Raja.

#8 OFFLINE   bobs

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Posted 12 November 2016 - 06:27 AM

Both my cmax and privious escape hybrid both have scrapping sounds until a few hard stops are made. No screeching though.

BTW mine lives outside so that could be the difference with rbort's.

Bob

#9 OFFLINE   RubyMax

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Posted 14 November 2016 - 08:41 AM

I'm not really sure what you guys are talking about, brakes should not be screeching and scraping.

 

-=>Raja.

I'm not sure it's screeching, but I have heard my brake make an audible scraping noise, that if you are not expecting, may sound excessive.  But agreed, it is just from the lack of use on the friction pads, where rust and gunk may be present.



#10 OFFLINE   Quake97

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Posted 14 August 2017 - 02:42 AM

Had something similar, maybe, after driving on a gravel road. Got a small stone/sock James in between some metal housing and the brake rotor. It was an amazing noise and worse when turning. If it's one wheel, maybe take it off and inspect. Mine was easy to find.

Joe








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