Bad clunk when depressing brake pedal
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Bad clunk when depressing brake pedal in Past Cadillac Vehicle Discussion; Hi I recently purchased a 99 sts with 188k on the body... the entire car is nearly mint but I ...
  1. #1
    jamesjohnsonair is offline Cadillac Owners Member
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    Bad clunk when depressing brake pedal

    Hi I recently purchased a 99 sts with 188k on the body... the entire car is nearly mint but I have come upon some suspension issues lately.... the problem is that every once in a while when I hit the brakes there is a loud clunk or bang as if the brakes are clamping to tightly too soon... I was told that there is a common problem with the caliper bracket bolts... does anyone else have any Ideas? also I am getting a click/popping noise when turning the wheel at a stand still and a good rattle up front at low speeds I believe they are three seperate issues but i thought I would mention them just in case.... I have also heard bad motor mounts may cause a "clunking" any thoughts?

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, slap in a big stereo
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    Re: Bad clunk when depressing brake

    Welcome Aboard !!!

    The braking "clunk" ......... front or rear ? If it's in/near the front end you may have a damaged front center motor mount - the entire drivetrain cradle mount system flexes when the brakes are applied .......... Open the hood, engine idling in P. Left foot on the brakes, right on the gas. Shift to D, holding the brakes, and bring the engine up to 1200 - 1500 rpm. Does it rock back toward the firewall more than 3/4" ? If so, suspect that center mount. Not that it would/might be the entire problem, but it would be contributory.

  4. #3
    wlewis is offline Cadillac Owners Member
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    Rattle at low speeds could be worn stabilizer bar links. I just replaced them on my 99 eldorado for the same reason. Replacements for my car were about $21 a piece at autozone.

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Bad clunk when depressing brake pedal



    Step one would be an inspection.

  6. #5
    98cadillac is offline Cadillac Owners Fanatic
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    Re: Bad clunk when depressing brake pedal

    Do Sevilles even have stabilizer bar links?

  7. #6
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Yes. No other way to connect the bar to the knuckles.

  8. #7
    drewsdeville's Avatar
    drewsdeville is offline Cadillac Owners Master
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    Re: Bad clunk when depressing brake pedal

    Motor mounts are good to check, as well as the forward control arm bushings.

  9. #8
    98cadillac is offline Cadillac Owners Fanatic
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    Re: Bad clunk when depressing brake pedal

    Quote Originally Posted by MoistCabbage View Post
    Yes. No other way to connect the bar to the knuckles.
    Ok, I must have been getting it confused with the torque struts.

  10. #9
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Ah. No, '98-'04 Sevilles don't have torque struts.

  11. #10
    jamesjohnsonair is offline Cadillac Owners Member
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    Re: Bad clunk when depressing brake

    I definitely have a bad front mount which i will be replacing next week and I will update either way

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    control arms are bad too!

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    Can anyone post an explode diagram of front and rear suspension for me?

  12. #11
    Submariner409's Avatar
    Submariner409 is offline If it won't run, slap in a big stereo
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    Re: Bad clunk when depressing brake pedal

    You NEED a real GM service manual - either from eBay or www.helminc.com. For instant gratification (service manual) plus a LOT more (so much that you have to learn the site inside and out) subscribe the car to www.alldatadiy.com

    Leave the Haynes and Chilton on the store shelves. Far, far, far too generic for your needs.

    There are special procedures and torque values for almost every suspension/brake part. Use the manual.
    thu and thu like this.

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