Squealing Noise From Rear Brakes

[llinthicum1]

This is an old topic, but was wondering are owners of newer Bronco Sports are still experiencing "moaning" from rear brakes when backing up vehicle in wet and/or colder weather? I understand that the cause is surface rust on brakes and noise stops after driving. I had thought this issue had been resolved, but I have a '25 Big Bend and having the same issue. I thought there was a TSB which fix problem, but can't find what the solution was. The dealership said it was the materials used for the rotors and pads and wasn't really a fix except to replace brakes.

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[Dude]

There are a half dozen TSBs but you’d want the dealership to use latest (if applicable to 2025s). I had TSB 24-2348 (not the most current TSB) Moan Noise In The Rear Brakes When Vehicle Is Driven In Reverse done on my 2022 with virtually no noise reoccurrence

A reported better rear brake moan fix: Damond Motorsports, brass brake caliper bushings that completely eliminate the caliper flex:
https://damondmotorsports.com/products/ford-escape-16-13-brake-caliper-bushings
https://www.broncosportforum.com/forum/threads/rear-brake-moan-fix.12683/

 

[PHRIOS]

Funny, we have a community here in Brazil where reports like this are quite common. Nobody has a definitive solution for this. I've heard about this noise since the 2022 model year. At dealerships here, they treat it as if it's nothing serious, which it isn't. But imagine this noise in a newly purchased vehicle. When the vehicle goes in for maintenance at the dealership, they end up doing a general check-up, adding oil, and saying that this appears on cold days, or with low humidity, or if the car's brakes are wet.

 

[Sandman]

This is an old topic, but was wondering are owners of newer Bronco Sports are still experiencing "moaning" from rear brakes when backing up vehicle in wet and/or colder weather? I understand that the cause is surface rust on brakes and noise stops after driving. I had thought this issue had been resolved, but I have a '25 Big Bend and having the same issue. I thought there was a TSB which fix problem, but can't find what the solution was. The dealership said it was the materials used for the rotors and pads and wasn't really a fix except to replace brakes.

I have a 21 First Edition model. I have inspected the rear discs and pads on numerous occasions. It’s not a mechanical thing. Simply rust film developing on disc surfaces when parked. When in reverse and breaking you have the noise.

 

[Greeno]

I've been debating the brass fix, but its interesting, on mine its the first reverse, or after a time of sitting, that it comes back.

What I think it the issue is, the brakes simply vibrate against their typical direction and hang up a bit when cold and wet. This rapid against the grain movment vibrates through the bushings. Wetness promotes this rapid catch and release/binding effect. The brass stiffens it all up, fords one hard one soft attempt is 50/50 or just reduces it.

After a drive, I can reverse and no noise.

I typically back in most places, home in summer not usually, but as long as I back in, I never have to deal with it lol. I can reverse into a spot, no noise. I can pull into a spot, reverse whereever just fine... but I'll be damned if I pull in, go shopping or have a beer... I'll come out reverse from the spot and it sounds like a school bus.

I've heard not using OEM rotors and pads help too, but considering my brakes are under a year old, I'm not chucking them just to get rid of this moan... but I will tell you first thing in the AM it is LOUD if I'm in a position to back out of my driveway. They use a very aggressive material on these because of all the off road tech baked into the ABS system for traction purposes.

I'm assuming the dealer preformed the TSB correct too... I have my doubts based on brake appearance lol.

They probably don't want to issue a brass solution as you in into metallurgy concerns and forget getting that brass out of aluminum with stuck pins at high mileage in the Northeast... that said I'm probably going to go for it because between being a phenolic piston, and the weather elements, I think for daily drivers there's been about 1 time I've ever not just done the calipers with the brakes anyway. Mines not going to be due for brakes again until probably 100-120k.... Loaded caliper kits are the way if the lube has given up and nothing slides... the piston has swelled etc and wont retract for a proper reset and bleed.

 

[TrueNorthSport]

I have a 21 First Edition model. I have inspected the rear discs and pads on numerous occasions. It’s not a mechanical thing. Simply rust film developing on disc surfaces when parked. When in reverse and breaking you have the noise.

I have a 2025 BSBB with about 4600 km and I have just started to hear the "moan" when slowly reversing and braking on cold and damp mornings.

I owned a Dodge Caravan for many years, a vehicle known for its poor brakes, and on cold and damp mornings I would hear more of a scraping noise but not a "moan".

This would suggest a "rust film" cause for the Caravan but what about the BS ?

Cheers

 

[justchillin]

Do the brass bushings from Damond Motor sports. I did them on my 22 Big Bend and it completely got rid of the moan regardless of the conditions or how long I have sat somewhere. I did not even have to pull the caliper all the way off to install the bushings either. It is very easy to do and well worth the money !! It has been about a month ago that I did this and so far so good !!

 

[jkernitzki]

Not sure if it’s the same brake noise I have, and have had on many rear disc brake cars, but it’s perfectly normal when they sit and are moist/cold. Even my Kia’s would do it pulling out of the garage. First time pulling out after washing the car and sitting overnight, guaranteed. It’s always gone before I make it to the street.

 

[llinthicum1]

I have a 21 First Edition model. I have inspected the rear discs and pads on numerous occasions. It’s not a mechanical thing. Simply rust film developing on disc surfaces when parked. When in reverse and breaking you have the noise.

That's what I understand. The noise is just annoying, but new brakes shouldn't sound like that.

 

[justchillin]

If it were rust /film that was devloping on the rotors, then why dont the front brakes make the noise when stopping in drive? Like I said, after installing the brass bushings on the rear calipers on mine, no more moan. I did not change the brake pads or rotors.

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