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Discussion Starter #1
This car is turning into one of those stories where it spends more time in the shop than in my hands. And yet, I still love the **** thing. Anyway I digress.

My latest weirdness is a random noise on braking. Anyone else experience this one:
  • Occurs only from the front driver side wheel.
  • Occurs maybe once or twice an hour of city driving
  • braking always feels normal. no brake loss before, during, or after the sound.
  • sounds like a gear binding up.
  • the noise seems to occur during the transition from regenerative braking to mechanical braking. IE: you only hear it when the car is around 5mph or less, and the noise will stop before the van comes to a complete stop.
  • It is loud enough that my 2 yr old asked me "what is that?" from the back seat.
  • I've no data regarding pressure applied to the braking system related to the noise. I've usually no reason to brake "hard" and all cases (so far) have occurred under "gentle" pressures.

I've had the entire hybrid drive train replaced under warranty and wonder if something to do with all that mechanical work has something to do with this weirdness. Thoughts?
 

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I have what I believe is the same sound on my front passenger side. Exactly the same symptoms - mine has done this since I drove it off the dealer lot. I always assumed it was just a mechanical noise associated with the transition between regen and friction brakes. If you end up having a dealer look at it, let me know if there is a resolution!
 

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So is the noise consistent during same braking speed , what happens if you take foot off gas and don’t brake and just slow ?
 

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Discussion Starter #4
The noise is pretty short lived. Lasts a second or two. I've not thought to lift off the brake to see if it cuts out in the middle or not. As for not braking and just rolling to a stop. Nope, not tried that. Probably can't since this only happens once every 60 braking events. If it was consistent I'd try.
 

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Mine is a distinct 'creaking' sound that occurs during the last bit of deceleration from, say, 5mph to 0mph. It seems more pronounced in cold weather. If I traveling at 25mph and apply light brakes, normal regen whine occurs down to about 5mph, then a mechanical creeeeaak (only while brakes are applied) down to 0.
 

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Discussion Starter #6
Dealer says they repaired both front "hub mating surfaces" with loc-tight. So, there you go.
 

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2020 Pacifica Hybrid Limited 35th Anniversary, White w/Black and Cranberry
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Similar noise, but sounds like a coffee maker perculating... definitely from passenger side - everytime we approach a stop, and in the 5mph to 0mph speed, but quiet at fully stopped... Agreed - only lasts a second or two. Agreed with thecyborg, its happened everytime we stop since purchase. Doesn't matter in full electric or hybrid mode, as in, makes the noise with ICE on too. Good point on checking if 'un-braking' stops the noise... i'm going to ask dealer about it, when it goes in for the W46 final fix. i can't think this is something to address with Loc-tight... this is a servo, or something mechanical - doing something, just want to know what it is.
 

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2020 Pacifica Hybrid Limited 35th Anniversary, White w/Black and Cranberry
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Similar noise, but sounds like a coffee maker perculating... definitely from passenger side - everytime we approach a stop, and in the 5mph to 0mph speed, but quiet at fully stopped... Agreed - only lasts a second or two. Agreed with thecyborg, its happened everytime we stop since purchase. Doesn't matter in full electric or hybrid mode, as in, makes the noise with ICE on too. Good point on checking if 'un-braking' stops the noise... i'm going to ask dealer about it, when it goes in for the W46 final fix. i can't think this is something to address with Loc-tight... this is a servo, or something mechanical - doing something, just want to know what it is.
Note - as the van went to the dealer to have W46 final fix addressed, we'd asked them to take a listen to our noise... they confirmed the noise, and explained that it is a set of servos involved with the regenerative braking system, and its unfortunate that we can hear it, but 'they all' do that, and its within Chrysler spec... note to tsarsov, when i take my foot off the brake while this is happening, the noise does stop, and then the next time i brake, it will happen again. I guess we just chalk it up as yet another interesting and weird noise that our unique vehicle makes.
 

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I think I had the same noise for the first time today. About 4 or 5 times, but I could not get the car to do it when I wanted, but a few times when I was not trying to listen, I heard it. Not very loud, so nobody else in the car said anything, but as a retired engineer, it was not a sound I like to hear.
 
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