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thump/grinding noise

Discussion in 'Ford Trucks' started by riverstone, Jan 24, 2011.

  1. riverstone

    riverstone Junior Member
    from ohio
    Messages: 5

    When i push brake pedal there is a thump ( can feel it at my feet) followed by a grinding noise coming from front end. Grinding noise is exactly same sound as when pads wear out. Pads,are fine.Rotors,calipers,wheel bearings,hub and everything else is only 4 months old.Also, the noise and thump will not happen in reverse. I'am at a loss. any suggestions? 04 F 250 SD 6.0 L
     
  2. tim096

    tim096 Senior Member
    from wny
    Messages: 100

    sounds like false activation of the abs, most likely caused by a front wheel speed sensor.
     
  3. riverstone

    riverstone Junior Member
    from ohio
    Messages: 5

    Could be. seems like abs is activating way too early. where is the location of that sensor?
     
  4. go plow

    go plow Senior Member
    Messages: 322

    loose wheel? i happened to me.
     
  5. 01lariat

    01lariat Member
    Messages: 96

    I don't have the grinding noise, but I have a thump. Still trying to find it.
     
  6. hydro_37

    hydro_37 PlowSite Veteran
    from iowa
    Messages: 3,790

    01 lariat.....check your sway bar bushings
     
  7. snowbankr

    snowbankr Member
    Messages: 49

    Check for a loose caliper...although different then yours, my 94 350 LF caliper rubber filled stamped steel "pins' fell out. The caliper would move around and scrape on the inside of the wheel in forward only. Reverse was fine. Had the growling, grinding, sound like the wheel bearing was exploding in the hub, or the axle u joint was grinding in the housing. Hope this helps.
     
  8. riverstone

    riverstone Junior Member
    from ohio
    Messages: 5

    Un plugged ABS wheel sensor and drove it around. still had same issues. All of the front end parts are solid. Will take calipers off and inspect today. Have had several people ride in truck with me (all mechanically inclined) and no one has a clue.
     
  9. snowbankr

    snowbankr Member
    Messages: 49

    Out today, grinding/scraping noise coming from passenger side. Looked into it, its was the spindle bearing. Going to NAPA in the AM.
     
  10. 01lariat

    01lariat Member
    Messages: 96

    Replaced the end links already. They were bad, but the sway bar bushings didn't look bad to the naked eye . Could be though? I have to service it this weekend. I'll look for it then.
    :mechanic:
     
  11. riverstone

    riverstone Junior Member
    from ohio
    Messages: 5

    Found the problem, The bottom caliper mounting bracket bolt was missing.