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Discussion Starter #1
2015 Mazda 3 Touring. I've had the dealer inspect this issue three times already to no avail, including the (supposed) front shocks replacement under warranty. I have a video that I recorded driving over a surface that highlights this issue but it happens anywhere there is a small bump or imperfection in the road.
https://youtu.be/q4EqVr1lAng

Any suggestion would be appreciated
 

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You are driving on a bumpy road, the inside of the cabin is rattling which would be normal in these conditions, hence the noise could be anything, it could the phone mount next to your window, the center console, the upper plastics of technology package etc...

Also when driving on the same conditions I can hear more or less the same noises as in your video, so for now everything looks normal to me.

It would be better if you drive on a normal road and capture the noise, at this point it is hard to advise what the noise could be, it seems more like loose plastics inside the cabin than a problem related with your suspension.
 

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I don't suppose your brake pedal has a long travel before it picks up? Ours recently had a rattle, perhaps not as severe as yours, which turned out to be a jammed brake pad wearing at an angle. The long travel was probably taking up the rattly slack before actually working.
 

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Try holding the piano black or silver trim piece that runs across the dash... I currently have a rattle problem with that piece.
 

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2015 Mazda 3 Touring. I've had the dealer inspect this issue three times already to no avail, including the (supposed) front shocks replacement under warranty. I have a video that I recorded driving over a surface that highlights this issue but it happens anywhere there is a small bump or imperfection in the road.
https://youtu.be/q4EqVr1lAng

Any suggestion would be appreciated
Have the dealer check the brake caliper slider pins for wear. It'll start to rattle as it wears. Common here in Malaysia.

You could try this as well. When moving on smooth roads at speed, take your right foot off the gas pedal and lean it against the side of the brake pedal. You'll probably feel a buzzing vibration. I feel obligated to say, check for traffic behind you before doing so.

Apparently Mazda will grease the pin up on the first complaint and replace it when the noise comes back.

My front ones were just greased earlier this week while the rears were replaced as I was told it was pretty badly damaged. All under warranty.
 

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Have you replaced your front brakes with aftermarket brakes? I had a 2014, and I replaced the front pads with aftermarkets and they rattled around because they were too small. Went with the OEM and no more rattling. Also there was a service bulletin that replaced the front calipers as they were designed wrong. Look to see or ask the dealer if a TSB applies to your car for that issue.
 

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Discussion Starter #9
Have the dealer check the brake caliper slider pins for wear. It'll start to rattle as it wears. Common here in Malaysia.

You could try this as well. When moving on smooth roads at speed, take your right foot off the gas pedal and lean it against the side of the brake pedal. You'll probably feel a buzzing vibration. I feel obligated to say, check for traffic behind you before doing so.

Apparently Mazda will grease the pin up on the first complaint and replace it when the noise comes back.

My front ones were just greased earlier this week while the rears were replaced as I was told it was pretty badly damaged. All under warranty.
Thanks tbcheese, I think you are right on the money!

I took it to the dealer and they ordered parts or something. Should have it back tomorrow. Before taking it in, I drove over this same surface and when the noise came up, I leaned my foot on the brake and the noise would immediately stop so it must be something related to the brakes for sure and the slider pins must be IT!

Will post back tomorrow or next week
 

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Thanks tbcheese, I think you are right on the money!

I took it to the dealer and they ordered parts or something. Should have it back tomorrow. Before taking it in, I drove over this same surface and when the noise came up, I leaned my foot on the brake and the noise would immediately stop so it must be something related to the brakes for sure and the slider pins must be IT!

Will post back tomorrow or next week
Great! Hope it's fixed now.
 

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Discussion Starter #11
Quick update. I did get my car back and they inspected it and even though I had specifically mentioned the brake calipers slider pins, they ended up replacing both sway bars. The steering feel is much tighter now, I like it better and the noise has, for the most part, gone away. I can still hear it on certain speeds/bumps combination but it's not anything like it was before so I am happy overall.

Can't complain much because they did this even after the 3 year warranty expired. This had been an ongoing issue they couldn't fix even before the warranty was gone so they honored it.. I still think there is something lose somewhere in the brake assembly. Maybe the pins or the pads, who knows. Eventually I'll take it to an independent brake specialist shop when I need to change the pads and see what they say about the pins also.

Thanks for your comments guys.
 
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