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2007 Kia Sorento Question: brake shimmy

 

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Visitor, 3.8L V6, Hillsborough, NJ, June 01, 2011, 15:34

replaced the front pads twice & the rotors once i get a harder shimmy at about 1/2 brake pedal and worse the higher the speed. hard brake or light brake they feel almost perfect I do have a high spot blueing on the rotor not sure if it's the calipars hanging (4 piston type) or maybe the rubber brake hoses? those are the only other things i can think of causing the problem. I have no problems stopping no pulling just the annoying shimmimg at normal braking the pads look evenly worn just the rotors have a 2" blue/high spot on both the originals and the new replacement rotors. I am stumped but don't want to buy new calipars on a hunch just yet without a 2nd opinion, thanks

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    June 01, 2011, 22:28
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     Master

    I would question the quality of the brake rotors. They are definitely the cause of your shimmy.

    Blue spots can indicate overheating - I would not suspect calipers or hoses unless the pistons could be verified as difficult to compress. Perhaps have a look to make sure the rear brakes are performing up to par. Granted - they are rear disc brakes, and should be pretty much trouble free also.

    Make sure all your caliper slides are lubed and not binding.

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    fishjersey2001, June 02, 2011, 06:04
     Rookie

    that's what I was thinking I had 4 piston on one of my other cars and never had a problem nor ever heard issues with 4 piston cals. the originals started about 35,000 and was sure it was the rotors even though they are vented I always thought they were too weak for the truck. I may just upgrade to a good H.P. rotor cause I drive a mtn.to work and high miles so.
    the rears are good the first thing I checked both the 1st time and when it started with the new pads & rotors. Thanks Dave

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    DaveJHM, June 03, 2011, 22:04
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     Master

    If you drive a mountain to work - indeed it may just be ...normal operating conditions that cause your overheating. Try downshifting to a lower gear instead of using the brakes as much. You've got the right idea, for sure.

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