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Bad brake grinding

Discussion in 'Engine & Drivetrain' started by optimusprime, Jan 10, 2021.

  1. optimusprime

    optimusprime Member

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    Took the tires off today and looked the brakes and rotors gave them a good look over. Rotors were smooth and didn’t appear to have any ridges. Brakes were all basically near factory thickness. Couldn’t see any brake dust build up but it’s been raining non stop so that might be a moot point. Brake lines looked clean. No excessive or noticeable wobble in the joints or bearings. Those were replaced a few years back anyways. Just a little rust powder? build up on the pads it seemed. I’ve attached a couple pics to show what I’m talking about.

    [​IMG]
    [​IMG]


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  2. Foggy

    Foggy Full Access Member

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    Looking at the 2nd pic.. Your sqeeler tab is only an 1/8 inch from the rotor itself..
    If i'm seeing it correctly
    So, your pads are at the last 20% or less of life...
    That's the outter pad, so the inner pads could be shot.
    You'll have to pull the caliper up to confirm. But that's my opinion.
    Your inner pads could be grinding/etc...
     
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  3. Rocket Man

    Rocket Man Build It Better Supporting Member

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    Agreed. There’s very little pad left on the outside one and considering there’s rivets to consider I’d be willing to say that one is close to grinding on a rivet, and the inside pads usually go faster. Pull the caliper bolts and slide it up- that’s the only way to inspect them right. I bet the rivets on the inside pads are starting to grind. Unless that picture is very deceiving.
     
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  4. Big Mama

    Big Mama Full Access Member

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    You can undo just the top bolt and fold it open. While in there check the guide pins to see if they’re stuck.
     
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  5. optimusprime

    optimusprime Member

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    Results are in. Brake pads are at 10.85mm on the outside and 10.51 inboard. Plenty of thickness from what I can tell. 1/4” is when you want them replaced right? But the rotors in the front are at 29.9mm and the discard thickness for the surakarta gold high carbon rotors is 28mm. The amount of wear from the rotors in a year and a half seems odd to me considering the brakes seem fine.


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  6. optimusprime

    optimusprime Member

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    [​IMG]
    There also seems to be a more pronounced lip ridge on the inside of the rotor.


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  7. Rocket Man

    Rocket Man Build It Better Supporting Member

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    That’s the same wheel as that lower pic in your other post where it looks like there’s no pad left? Weird. But yes the rotor wear is interesting. Do you think the rotors are wearing due to the pads?
     
  8. Foggy

    Foggy Full Access Member

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    Pull the pads.. Clean everything up. Clean and lube the pin slides.
    Scuff the rotors and pads and hit the road...
    IF the grinding is in the brakes, then that should solve it.
    Otherwise, you may have a different issue.
    I've seen where there's plenty of pad and rotor, but some crap got
    stuck between there and is causing noise and erratic wear
     
  9. optimusprime

    optimusprime Member

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    Outer rear pad
    [​IMG]


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  10. Big Mama

    Big Mama Full Access Member

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    Are those 2 spots from debris?


    really sounds like the caliper is sticking. As mentioned you can pull and grease the guide pins to see if that helps.
     

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