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warped rotor?

This is a discussion on warped rotor? within the General Help forums, part of the LSx Technical Help Section category; I got some Baer Decella rotors and Morse ceramic pads last summer at Autozone. The other day I was driving ...

  1. #1
    Junior Member chuckstop00's Avatar
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    warped rotor?

    I got some Baer Decella rotors and Morse ceramic pads last summer at
    Autozone. The other day I was driving to work and started getting a bad
    vibration at about 70 mph on the right front. If I slow down it goes away. When I drove home, it did the same thing, but only after 5-7 miles. When I got home, I touched the rotors, and the rf was hot, but the lf front was only warm. Thinking this might be a hung up pad, as the inboard side of the rotor was hotter than the outboard. Going to break it down this weekend and look. The question I have, is there an easy way to tell if the rotor is warpped? I am hoping that because it doesn't vibrate right away, even at 70-75, that
    the rotor might still be ok. Also, they should still be under warranty, 3yrs, so
    I need a way to see if it is warpped.

  2. #2
    Senior Member bigrondownhiller's Avatar
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    do you have a dial indicator? it only takes a little bit of runout to cause a vibration.

  3. #3
    Junior Member chuckstop00's Avatar
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    no. eyeball only, may not be good enough. Another idea I had is a straight
    edge, at least that would work for the inboard side.

  4. #4
    lets line-um up!!! lightingrod's Avatar
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    pewter
    2000 t/a

    more info needed.

    does it pulsate when braking at 70? or is it shaking the car without braking like a out of balance tire at 70? stock rims/tires? is the car lowered? wheel bearings howling? alignment caster shake? u-joint? shocks?loose lugs? driving over the same uneven road surface streach of highway? ect. more imput needed.



    also the the rotors are going to be hot and burn your fingers after you have driven it and applied the brakes a few times. the piston side of the rotor will allways be hotter. thats where the primary force is applied the the inner and transfured to the outer pads. is the either of the rotor surfaces turning blue?

    a straightedge isn't going to tell you anything you need a dial indicator to measure runout properly.

  5. #5
    Junior Member chuckstop00's Avatar
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    Pulsate at 70? No - however, a few weeks back I did notice that if I used
    the brakes firmly, they would pulsate a little, then it would stop. It cleared
    up by itself, so I thought it was just dust/dirt or something.

    I drive about 20 miles on the highway to/from work. Had been fine until a
    couple daze ago. I was about halfway to work and it started shaking on the
    rf, actually thought I had a tire going down. On the way home, same thing,
    was ok for half way then started shaking again. This was at 70. Slowing down
    to 60 made it go away, but speeding up would make it come back. Didn't do
    that for long. Now I go the back roads, 45 to 50 tops, no vibration, even
    under firm braking.

    I typically don't use the brakes a lot anyway, 6-spd and downshift with SLP
    loudmouths more fun anyway!

    As far as the tires/rims, tires have maybe 15K, but the rims are bone yard
    stuff, had to take the peeling chrome stock rims off. Had these rims on for
    about the same time as the new brakes ~ year.

    As for the heat, one side is definetly warmer, rf vs lf.

    Will be looking at it over the weekend and update. Will also check suspension
    and stuff.

    Appreciate all the feedback!

  6. #6
    lets line-um up!!! lightingrod's Avatar
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    pewter
    2000 t/a

    viberations are a funny thing and can be hard to diagnoss. they can transmit from one end of the car to the other, making it seem that the vib is coming from one area when its actually coming from another.

    well from how you are explaining it, the brake rotors are not your problem. there only going to shake the car when you apply the pedel. lessin their pulsating so baddly that their shaking your teeth out.
    for the amout of time they have been run, you would have felt an out of balance rotor from the get go. older rotor design had weighted plugs insreted into the cooling fins for balancing and, have been known to loosen and fall out. newer designs are now counter balanced by grinding away material. which is what design your's are. very hard to knock these designs out of balance. less you sledgehammered them to remove them from the flange.


    bent rim? no wads of rust between the rim and flange? ....have your tires balanced on a properly caliberated machine. an out of balance tire will pound the road surface ,and the vibs will be absorbed by the shock till, the fliud becomes hot and thin then you'll begin to feel it through the car.
    than again your shock could be ready to shit the bed and cause this vib. rightside suspension allways takes the most abuse from potholes and such.

    tierod joint and upper ball joint tight? if there loose they can cause a vib.

    u-joints on the way out can cause some funny viberations. they may not be loose to the touch, but the needle bearings can be dried up and just starting the send out the shake of death. take a peek at those. while your there look for the balance weights on the driveshaft itself. they can loosen over time and fall off, or be knocked off from road debris kicking up. steel shafts will have a small circular spot weld and aluminum shafts will have an epoxy patch where the weights are/were. they'll both usually have one on both ends.

    have your alignment checked.

    motor/trans mounts trashed?

    one otherthing, brake pads are cheaper to replace than a flywheel, pressure plate and clutch disc.

  7. #7
    Junior Member chuckstop00's Avatar
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    not if u shift right
    Thanks for the tips, will be looking at stuff over the weekend. Need to do a
    water pump (rattling and leaking) and power steering pump (leaks when real
    cold) anyway, so I will have all the tools out.

  8. #8
    JEB
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    Sounds as if you may have an out of balance wheel/tire.

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    Junior Member chuckstop00's Avatar
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    Well, things didn't go exactly as planned. The good news is that changing the
    water pump got rid of the rattle from the old one. Bad news is the rebuilt
    power steering pump I put on leaks worse than the old one. Looks like it's
    coming out of the back of the unit. Bottom line is I didn't get much time to
    diagnose the vibration. I did jack up the rf with the wheel on and pulled and
    pushed on it in various directions. Doesn't seem to have any loose suspension
    parts, tie rod end, ball joints. So I took the wheel off and spun the rotor by
    hand, didn't seem to feel any uneven pressure. Pads looked pretty good. So
    put the wheel back on, and now it shakes under braking at about 50 mph.
    Gonna check where I bought the rotors and see if they have a way to check
    them out. Aggh! While I was under the car, I noticed some surface rust under
    the back seats!!!!!!!!!! The more you look the more you find . . . .

  10. #10
    Junior Member chuckstop00's Avatar
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    Well, after getting the ps all set, missed an o-ring as stated in another thread
    I tore apart the front brakes. I found that a slide pin on the passengers side
    was sticking slightly, and one on the drivers side was frozen completely. Had
    to get a new bracket. Now the vibration at speed is gone. But once in a while
    I still get some shudder when I get on the brakes. But if I let off, then brake
    again, even if I speed up, there is no shudder. The calipers/pistons didn't look
    all that great, so I am thinking maybe one is sticky. If the rotor was warpped
    the vibration would be constant under braking right? Would speed matter?

  11. #11
    Retired NOT tired SteveC's Avatar
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    Thumbs up

    Quote Originally Posted by JEB View Post
    Sounds as if you may have an out of balance wheel/tire.
    I agree 100%.

    SteveC

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    Member 99'CajunFirehawk157's Avatar
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    Talking On the same subject...

    I went to have a nail removed from my rf tire last week, seems the prev owner was a lil sloooooow and used at least one can of fix a flat or maybe two and LEFT IT IN THE TIRE, not ever getting it repaired, well just imagine adding a 16oz glass of water to the inside of your tire and driving that around for a while, @ 55-60mph the front danced like oprah on crack, tire fixxed the correct way, no vibration.


    PS-My brakes do pulsate a lil upon braking but I think that a stock gm thing...new rotors coming soon.

  13. #13
    Senior Member 02z28ls1's Avatar
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    Fix a flat is really a bad idea-not just because of the balance thing. It deteriorates the rubber. I would replace this tire if you drive or corner hard-wouldn't trust it.
    Generally speaking, as a rule, tire balance issues will surface around 30-35 mph. Other vibrations will be under different circumstances.

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    true

    Agree, I moved that tire to burn out ville... (the rear)

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    Senior Member 02z28ls1's Avatar
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    Give it hell !!

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