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Mysterious brake sound no mechanic can solve

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Old Oct 25, 2020 | 08:26 AM
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Default Mysterious brake sound no mechanic can solve

2016 mazda 6 touring 6 speed
Braking noise that 2 mechanics can't figure out. This happened after changing brakes and rotors. Had them recut no change. No wheel vibration or pulling. Brakes were taken apart a few times to inspect, no change. Mechanic changed the pins, no change.
this does not happen braking in reverse.

the sound is very loud and prominent right at the end of braking as you come to a full stop.

https://youtu.be/0u2M2EC0TtU

https://youtu.be/RPsK5tdqlNU

https://youtu.be/EJRVFs-NF-E

https://youtu.be/Hg_gx5rpx3M

https://youtu.be/uxgktYNBTjc

https://youtu.be/WXpFRdOGj4s
 

Last edited by Jamesdhudson92; Oct 25, 2020 at 08:51 PM.
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Old Oct 25, 2020 | 10:08 AM
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The video's not the best but from what I can pick up it does not sound break but axle related. This is a guess only because I have herd similar sound on customers as well one of my vehicles. When the vehicle is on the rack and the front suspension hanging the sound is not there because no weight resistance. I had to finally use a sound meter to determine it was the output shaft seal was causing the sound and increased the sound level when light braking. So because most of the time there was high mileage on the axles I replaced the axle assembly any bearing if applicable and the output shaft seal The sound was cured.

A theory :Because the sound came about after your brakes only means that the suspension was hung at some point in a position not normal and the wear already existing on the axle or seal was accelerated.

This is all speculation (guessing) based on viewing the really short and poor quality videos and hearing what I think was a familiar sound?
 
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Old Oct 25, 2020 | 10:14 AM
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Originally Posted by Callisto
The video's not the best but from what I can pick up it does not sound break but axle related. This is a guess only because I have herd similar sound on customers as well one of my vehicles. When the vehicle is on the rack and the front suspension hanging the sound is not there because no weight resistance. I had to finally use a sound meter to determine it was the output shaft seal was causing the sound and increased the sound level when light braking. So because most of the time there was high mileage on the axles I replaced the axle assembly any bearing if applicable and the output shaft seal The sound was cured.

A theory :Because the sound came about after your brakes only means that the suspension was hung at some point in a position not normal and the wear already existing on the axle or seal was accelerated.

This is all speculation (guessing) based on viewing the really short and poor quality videos and hearing what I think was a familiar sound?
Mazda thought they heard a front shock sound and they warranty replaced the front struts. No change
 
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Old Oct 25, 2020 | 10:16 AM
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Videos are hard to hear, but when the car is driving above about 15 mph , during braking you can hear a squeaking similar to the low brake pad warning. It's not until you get very slow do you hear the other sound, which I'll admit does sound like a suspension sound, but the second you come off the brake it goes away.
 
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Old Oct 25, 2020 | 10:18 AM
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Originally Posted by Jamesdhudson92
Mazda thought they heard a front shock sound and they warranty replaced the front struts. No change
LOL mechanic's that can't find the problem with brakes and suspension and MAZDA replacing something that can never make a rotating sound???? Time to move out of New York!
At this point go to a *Firestone (in your area) and get a free inspection....



* most Firestone will only use a Trained Mechanic with some form of certifications?
 

Last edited by Callisto; Oct 26, 2020 at 08:54 AM.
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Old Oct 25, 2020 | 10:22 AM
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Haha to be fair, I had a local guy do the brakes, thats when the noise started. Went back 3 times, that's when they tried recutting and changed the pins thinking maybe there was a little play in them.
Mazda looked at them because I was bringing it in to warranty replace the tensioner. I asked them about the noise and they determined to replace struts.
They said "well we do see so some hot spots on the rotors."
 
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Old Oct 25, 2020 | 10:33 AM
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Originally Posted by Jamesdhudson92
Videos are hard to hear, but when the car is driving above about 15 mph , during braking you can hear a squeaking similar to the low brake pad warning. It's not until you get very slow do you hear the other sound, which I'll admit does sound like a suspension sound, but the second you come off the brake it goes away.
Ok go re-read my first response...... many sounds can be from resistance applied. In this case the evidence is that the sound was not there before the brakes were done. IMHO it does not sound like brakes but axle related. If you have another "qualified" person inspect it I suggest don't mention the brakes you just had done and let them determine the sound. This way you don't stick a predetermine thought that it may be brake related into their head. This is also why I suggest to take it to Firestone for an inspection. The technician will see the newer brakes parts and will look beyond them for what is making that sound instead of puzzled by the brakes? If I get a customer that seems to know more then me (LOL) and if there is a condition that I now have stuck in my brain from that "smart" customer as to what it was I will have one of my Technicians evaluate and give thought to what they determine the problem is.
 
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Old Oct 25, 2020 | 08:37 PM
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Jamesdhudson92 what vehicle do you have?

I know older CX-5s have a habit of snapping the calliper shims.

***Generic photo***

 
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Old Oct 25, 2020 | 08:51 PM
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2016 mazda 6 touring 6 speed
 
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Old Oct 26, 2020 | 07:05 AM
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It would pay to get the brakes dismantled and inspected very carefully.
 
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