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Thread: Could this noise be from bad rotors?

  1. #1
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    Could this noise be from bad rotors?

    There is a pulsing in the brake pedal when pressing. Pads were just replaced, but now I am thinking the rotors might be warped.

    I have posted a short video of it. Sorry the bandwidth of my NAS isn't great.

    https://unicorncomputer.us.quickconn...3833352e6d7034

    Thank you,

    Steve

  2. #2
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    Sounds like rotors are bad

  3. #3
    Work in Progress sm1ke's Avatar
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    You can't warp your rotors. http://www.brakeandfrontend.com/warped-rotors-myth/

    They likely need to be resurfaced or "turned". I would take the car to a reputable shop to have the rotors inspected with a micrometer. If the rotor is above it's minimum thickness, have them turn your rotors to get more life out of them. I'd suggest getting this done right away since you just got new pads.

    The warping rotor myth is just a way for the shop to earn more money by replacing a part that just needs maintenance with a brand new part.

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    Agreed. However this type of work needs to be doen correctly. I had a bad experience with that is the past. Still had to get new rotors....(sigh) I blame the shop...
    Quote Originally Posted by sm1ke View Post
    You can't warp your rotors. http://www.brakeandfrontend.com/warped-rotors-myth/

    They likely need to be resurfaced or "turned". I would take the car to a reputable shop to have the rotors inspected with a micrometer. If the rotor is above it's minimum thickness, have them turn your rotors to get more life out of them. I'd suggest getting this done right away since you just got new pads.

    The warping rotor myth is just a way for the shop to earn more money by replacing a part that just needs maintenance with a brand new part.

  5. #5
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    Has anybody used this brand of rotor before and what do you think of them?

    A pair of rotors for $61 shipped with 10 year warranty

    https://www.am-autoparts.com/product...?m=1179&y=2012

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    does anybody have an suggestions for inexpensive rotors that are decent?

    Links?

    Thank you,

    Steve

  7. #7
    Work in Progress sm1ke's Avatar
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    If you want the cheap solution, resurface your rotors. If you want new rotors for some reason, buy OEM, or something comparable to OEM (i.e. talk to an independent shop to get their recommendations).

    Brakes are not a component I would cheap out on, the risks are too great should something fail.

    Beyond that, do not buy drilled or slotted rotors, buy blank ones. They provide the best stopping power and pad life due to the increased surface area in contact with the pads.
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  8. #8
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    I just replaced the front rotors sounds still exists. hopefully going to do rear rotors next month.

    Any other possibilities to check?

    Thank you,

    Steve

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    Maybe the caliper needs to be greased

  10. #10
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    All 4 rotors and pads replaced. Noise still exists. I have noticed one caliper boot is torn, ordering replacement.

    https://youtu.be/Rd1cL9OlRKA

    No movement up and down or side to side, so I not thinking wheel bearing.

    ?

    Thank you,

    Steve

  11. #11
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    Quote Originally Posted by unicorncomputer View Post
    All 4 rotors and pads replaced. Noise still exists. I have noticed one caliper boot is torn, ordering replacement.

    https://youtu.be/Rd1cL9OlRKA

    No movement up and down or side to side, so I not thinking wheel bearing.

    ?

    Thank you,

    Steve
    Hard to say with 100% certainty from video since road noise and tires are involved, but that sounds like a wheel bearing howl for sure. Bad bearings don't always show play in wheel so that test is not definitive. Spin each wheel when in the air and see if one or another is rougher.

    OTOH it could just be a bad tire.

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    Quote Originally Posted by unicorncomputer View Post
    All 4 rotors and pads replaced. Noise still exists. I have noticed one caliper boot is torn, ordering replacement.

    https://youtu.be/Rd1cL9OlRKA

    No movement up and down or side to side, so I not thinking wheel bearing.

    ?

    Thank you,

    Steve
    Make sure whoever replaced your pads put the backing plate and clips back on properly. This prevents pads from moving around and making noise. Had this happen to me when I got brakes done( not at dealer). They forgot to put clips back on.

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    With AWD, do I need all four tires off ground to spin or just the fronts?

    I have already tried spare on front left, I will try it on front right next.

    Thank you,

    Steve

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    Quote Originally Posted by Thaumaturge View Post
    Hard to say with 100% certainty from video since road noise and tires are involved, but that sounds like a wheel bearing howl for sure. Bad bearings don't always show play in wheel so that test is not definitive. Spin each wheel when in the air and see if one or another is rougher.

    OTOH it could just be a bad tire.
    I had this same noise on my infiniti g35x and it was a bad front wheel bearing, so of course, I changed both front wheel bearings. Car drove like a BRAND new car after that.

  15. #15
    Biggie T Skinny helbigtw's Avatar
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    Steve, i'm assuming you are aware of the fatal all wheel drive flaw on the cx-9? (they took the ford edge transfer case and bolted it onto the cx-9 ) it eats itself and the transmission and early signs are bad noises particularly during turns.
    I hope for your case that you are not on your way to a 4,000 dollar bank withdrawl for a new transfer case & transmission.
    Hopefully its something simple! If you haven't read up on the all wheel drive issues, there are plenty of threads to read through on here.

    Good luck, sir.

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