HC making a weird scraping sound - any ideas??

Discussion in 'SRT Hellcat General Discussions' started by Hubbs, Apr 26, 2016.

  1. Hubbs

    Hubbs Silver Member

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    Today when I was driving about 5-10 mph in a parking lot I suddenly started hearing a pretty loud scraping sound form under the car. I had the windows down, but still couldn't tell exactly where it was coming from.

    If I were to guess, it's brake related judging by the type of sound and how it changes with vehicle speed. My other thought was something dragging on the driveshaft or on the ground. It sounds a lot like dragging the edge of sheetmetal on the ground.

    I got down on one knee and looked under the car from each side, but couldn't see anything unusual.

    What I do know is:
    It's not engine related (or engine speed related).
    It IS vehicle speed or wheel speed related.
    It doesn't seem to be affected much by hitting the brakes.
    It does not sound like clicking rotors.
    I can't feel anything through the steering wheel or seat tied to the sound.
    The fender is not dragging on the ground. (ha)

    Since I didn't find anything obvious, I drove around a bit at slow speed braking, accelerating, etc. trying to figure it out. After about a minute of this it suddenly went away.

    If it keeps doing it, I'll try to get a video to capture the sound. I want to avoid the dealership as much as possible, so I'm not heading straight there! o_O
     
  2. ciphros

    ciphros Gold Member

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    Probably a stone caught in the caliper. If you have a friend that can listen, should ebsd able to isolate which wheel.
     
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  3. Robocop1127

    Robocop1127 Silver Member

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    It sounds like it's brake related. One of your calipers could be hanging up and sometimes a collapsed brake line is the cause for the caliper to remain as if the brakes were applied thus causing the pads to rub against the rotor. Seen it many times over & over on the SRT8 product line of vehicles.
     
  4. Hubbs

    Hubbs Silver Member

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    But why the noise? Rotors are about the same temp side to side, so don't think it's a caliper...but good idea.
     
  5. Hubbs

    Hubbs Silver Member

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    Hmmm, good idea as well. Since the sound just stopped suddenly, I'm betting you're right!

    Thx guys!
     
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  6. TallCool1

    TallCool1 Gold Member Hellcat Car Club Gold Supporting Member Nat'l Hellcat Tech Advisor HCC Charter Member

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    Capture sound, share.
     
  7. Catscratch Fever

    Catscratch Fever Silver Member

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    I'd say your rear differential. Low speeds like 5-10 mph while turning. Go to a large empty parking lot and do slow figure eights.
     
  8. TallCool1

    TallCool1 Gold Member Hellcat Car Club Gold Supporting Member Nat'l Hellcat Tech Advisor HCC Charter Member

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    If it comes back put in neutral or disconnect procedure like you would during tow. Push the car usually you can hear something outside if its wedged in a caliper at any speed with engine off.
     
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  9. Robocop1127

    Robocop1127 Silver Member

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    If a caliper hangs up in an applied condition the pads will drag causing the scraping sound. Luckily, it's no longer making the sound but if a rock or anything else was caught in the caliper I'd be looking for damage to the rotor now but good luck with things.
     
  10. Hubbs

    Hubbs Silver Member

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    I will if it comes back!

    No, this is a harsh scraping sound, not a growling shutter like sticking clutches. I'm familiar with that sound! It also did it while going straight. Thx for the thought though.
     
  11. pivotal

    pivotal Senior Hellcat Member

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    I'm hearing something similar. It happens at low speed - especially in 2nd gear below 20mph. It goes away when I press in the clutch - is noise from the clutch/flywheel normal in this car?

    I'll try to take video as well, but I'm not sure how much of the sound will be picked up.

    Matt
     
  12. Hubbs

    Hubbs Silver Member

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    Hmm, I'd say NO. Could it be your throwout bearing?
     
  13. pivotal

    pivotal Senior Hellcat Member

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    It's possible, but what's more confusing is the noise is not consistent. It only happens some of the time - usually at the end of a 45-60 min drive (my normal commute). I'll have the whole car looked over in a couple weeks.

    Matt
     
  14. spbmopar

    spbmopar Senior Hellcat Member

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    I vote for a stone stuck in the caliper backing plate. Jack it up and spin the wheels, i'm sure its something simple.
     
  15. pivotal

    pivotal Senior Hellcat Member

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    I'll take a look at that - thanks for the suggestion.

    Matt
     

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