Any brake specialists?

[aro]

I have a strange chirping noise from the brakes and I can't find much information online. It's not the normal squeak you get with used pads (plenty life left in them).

I jacked the front passenger side and removed the wheel. Pushed the ignition twice to get the brakes going, and had my wife press the brake pedal.

She would release, I would start turning the rotor by hand and I would hear the chirping for 3-4 seconds. Then it would stop chirping while I still turned the rotor.

She would brake/release again and I would start turning again the rotor. Same chirping for 3-4 seconds, and it does it when turning in either direction. I wasn't able to localize exactly where it's coming from.

The chirping doesn't happen when braking and releasing alone. Only after the wheels start turning.

I removed the brake pads on that side, greased everything, put them back... and it's still chirping.

I checked the front driver side and same chirping, maybe a little less. I didn't check the rear wheels.

Any ideas? The internet wasn't very helpful with this specific issue.

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[Kreepin1]

I have a strange chirping noise from the brakes and I can't find much information online. It's not the normal squeak you get with used pads (plenty life left in them).

I jacked the front passenger side and removed the wheel. Pushed the ignition twice to get the brakes going, and had my wife press the brake pedal.

She would release, I would start turning the rotor by hand and I would hear the chirping for 3-4 seconds. Then it would stop chirping while I still turned the rotor.

She would brake/release again and I would start turning again the rotor. Same chirping for 3-4 seconds, and it does it when turning in either direction. I wasn't able to localize exactly where it's coming from.

The chirping doesn't happen when braking and releasing alone. Only after the wheels start turning.

I removed the brake pads on that side, greased everything, put them back... and it's still chirping.

I checked the front driver side and same chirping, maybe a little less. I didn't check the rear wheels.

Any ideas? The internet wasn't very helpful with this specific issue.

Unlike drum brakes, disk brakes do not retract after you release the pedal. The slight amount of runout (wobble) in the rotor pushes the pads back but there is always a little bit of drag. If the caliper pins don't slide easy the pads don't get pushed back and wear out quicker.

The chirping you are hearing is during this centering phase. Depending on how irritating the noise is and how valuable your time is you could try some "disk brake quiet" goop on the back of the pads, it's designed to damp out vibrations. If that doesn't work I'd try new rotors and pads next. Note that the tradeoff of higher performance pads is that they are often harder and more likely to squeak in my experience. They also have reduced stopping power when cold.

 

[aro]

Thank you. I am not bothered at all by the noise, it's not that loud. and the braking performance is the same. The main thing is to know that I can rely on the brakes. Other than that, I don't care much.

I might look more into it at some point. I would like to pinpoint exactly the root cause, for my own education.

 

[D60]

Supposedly rotor push-back is a thing of the past and they now rely on seal design to retract pistons.

IIRC I read this from TMT (TooManyToys) on FTE and he definitely knows his brakes.

Not that any of that helps OP....but I too am inclined to think he's getting some noise until the piston retracts "enough"......however that occurs

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