99 STS - where is my brake fluid reservoir ?
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 99 STS - where is my brake fluid reservoir ? in Past Cadillac Vehicle Discussion; 99 sts where does brake fluid go can't find reservoir...
  1. #1
    jaybee86 is offline Cadillac Owners Member
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    99 STS - where is my brake fluid reservoir ?

    99 sts where does brake fluid go can't find reservoir

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 99 sts where is my brake fluid tank

    On the firewall - the translucent polypropylene tank with the black cap - brake fluid logo on it - attached to the master cylinder which is attached to the power booster diaphragm can.

    In the engine compartment in front of the brake pedal .....................................

    Don't overfill it !!!! - read the legend on the side.

  4. #3
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    And if it's low enough that you got a brake fluid warning, you have a leak.

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    Re: 99 sts where is my brake fluid tank

    Quote Originally Posted by MoistCabbage View Post
    And if it's low enough that you got a brake fluid warning, you have a leak.
    ------------------------------------------
    or your brakes are worn down to nothing -

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    jaybee86 is offline Cadillac Owners Member
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    Re: 99 sts where is my brake fluid tank

    Pedal goes to floor sumtimes but it always stops

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    basscatt's Avatar
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    Re: 99 sts where is my brake fluid tank

    Quote Originally Posted by jaybee86 View Post
    Pedal goes to floor sumtimes but it always stops
    ---------------------------------------
    Pedal goes to floor sumtimes but it always stops

    YOU NEED TO GET THIS CAR INSPECTED BY A PROFESSIONAL MECHANIC -

    CONSIDER THIS A POTENTIAL DEADLY WARNING -

    YOU HAVE A DANGEROUS BRAKE CONDITION -

    TOTAL AND COMPLETE BRAKE FAILURE IS IMMANENT -

    THE VERY NEXT TIME YOU PRESS THE BRAKE PEDAL -
    THE PEDAL COULD GO ALL THE WAY TO THE FLOOR -
    THERE COULD BE NOTHING THERE - NO BRAKES AT ALL -

  8. #7
    9302Eldug is offline Cadillac Owners Fanatic
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    Re: 99 sts where is my brake fluid tank

    Get it checked immediately. Probably a bad master cylinder.

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    Re: 99 sts where is my brake fluid tank


  10. #9
    Submariner409's Avatar
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    Re: 99 sts where is my brake fluid tank

    jaybee86, Whatever you do, PLEASE do NOT drive that car until you have either a very, very good shadetree friend or a local shop inspect the braking system. You have BIG problems and in the condition the car is in right now you could kill someone - even yourself - the next time you leave the driveway.

    I'm dead serious - get it looked at BEFORE you drive it. You should NEVER have let it get to this point.

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    jaybee86 is offline Cadillac Owners Member
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    Re: 99 sts where is my brake fluid tank

    Ok parked it n had it looked at and the rubber on the cap was all twisted n the guy said it was sucking in air in does that sound rite?

  12. #11
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    Quote Originally Posted by jaybee86 View Post
    Ok parked it n had it looked at and the rubber on the cap was all twisted n the guy said it was sucking in air in does that sound rite?
    Sounds like the brakeline has been compromised. Post pictures if you can

  13. #12
    jaybee86 is offline Cadillac Owners Member
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    Re: 99 sts where is my brake fluid tank

    At work he said they need to be bleed and filled back up

  14. #13
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 99 sts where is my brake fluid tank

    The master cylinder reservoir cap has a pleated rubber insert - a bellows - that separates the brake fluid from air (brake fluid simply LOVES moisture). As the pads wear, fluid level drops and the rubber bellows expands and compensates for the fluid level drop while still sealing the reservoir from air intrusion.

    If you do your normal underhood fluids checks every month you'll see the brake fluid level drop over a year or so (barring system failure). If you have never done reguar checks, either the brake fluid warning will show (idiot light message) or you'll get to your problem now - air in the brake system - and now need professional help to refill and bleed the system.

    If you DO perform regular underhood checks and keep the brake fluid reservoir at the fill marks on the side of the reservoir, then when you replace brake pads and squeeze (front) and screw (rear) the caliper pistons back into the calipers you must remove some fluid or it will overflow the reservoir.

    Because brake fluid is very hygroscopic (likes moisture) it is a good idea to have a brake fluid exchange done every 5 years.

    .......... and there's a pcture and paragraph on the brake fluid level and master cylinder reservoir in your owner's manual.

  15. #14
    jaybee86 is offline Cadillac Owners Member
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    Re: 99 STS - where is my brake fluid reservoir ?

    Ok just talked to my dumb cousin and he said that when he used it he put power steering fluid in the brake tank I have no sticker on cap so he didn't know bout a month ago so how bad could that be and thanks for all the help

  16. #15
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 99 STS - where is my brake fluid reservoir ?

    I hate to be the bearer of bad news, but your "cousin" now probably owes you several thousand dollars in a brake system overhaul. Power steering fluid is absolutely NOTHING LIKE brake fluid - the system is now contaminated, the special formula rubber in the calipers and master cylinder is rotten/eaten up/dying, and you need to replace almost the entire brake system.

    You NEED to explain this to a GOOD ASE mechanic at a local Mom & Pop shop. Tell him I sent you. Quote me if you wish.

    Proper brake fluids and level checks are covered in the owner's manual.

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