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Thread: Worn Master Cylinder?

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  1. #1
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    Worn Master Cylinder?

    My braking pedal feel is inconsistant. Sometimes, it's REALLY tight and won't go down at all after what feels like a few millimeters, but the brakes really don't grab all that well (kinda like just having your brakes washed feeling). Other times the pedal almost sinks 3/4 of the way just to really start engaging the brakes. Any ideas?
    "Daisy tumbled short of his dreams, not through her own fault, but because of the colossal vitality of his illusion... No amount of fire or freshness can challenge what a man will store up in his ghostly heart. " - F. Scott Fitzgerald, The Great Gatsby

    "I have not failed 700 times. I have not failed once. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work." - Thomas Edison

  2. #2

    brakes

    :twisted: If it was the master either you will see the leak in the engine compartment or it would go down slowly to the floor all the time but it could be air on the lines just bleed it first and adjust the rears if it has rear drums and also take your wheels off and check for leaks especially at the wheel cylinders under the boots :twisted: your welcome

  3. #3
    Official TGC Pop-Pop Fishboy55's Avatar
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    Peter, gotta gree with Vegas. Sounds like you've introduced air in the system somehow. Normally this shouldn't happen unless there's a problem with the brakes, since the brake system is sealed. First check the obvious, like fluid level and look for leakage. Check the rubber seal in the Master Cylinder cap and make sure it's seated and not damaged. If nothing obvious, bleed the brakes. I'd recommend getting a set of speedbleeders and putting them in. It makes the job a whole lot cleaner and easier.

    Lastly, the brake fluid could be corrupted. I remeber manybrews telling me that it should be flushed and replaced like every 30K (?) miles or so, because it eventually breaks down over time.

    Chip
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  4. #4
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    Hmmm...righties thanks. I think I'll just go in for a complete brake job then. I haven't had my brakes checked out since about 15k miles, might be time. Think I should stick with the dealer or someone that specializes in brakes like Brake Check?
    "Daisy tumbled short of his dreams, not through her own fault, but because of the colossal vitality of his illusion... No amount of fire or freshness can challenge what a man will store up in his ghostly heart. " - F. Scott Fitzgerald, The Great Gatsby

    "I have not failed 700 times. I have not failed once. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work." - Thomas Edison

  5. #5
    Official TGC Pop-Pop Fishboy55's Avatar
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    I don't know Brake Check, but I sure wouldn't go to the dealer. If Brake Check is a reputable place, go there. It's bound to save you money over the dealer.

    Chip
    Chip

    2000 Basalt Black Metallic GTZ
    (Paint Code: Porsche LC9Z)

    Genuine experience carries a lot more credibility than the ability to answer a question.


  6. #6
    As a rule of thumb, I always bleed my brakes every time I change the pads anyways. But also for every 30k or 2 years, which ever comes first, you should flush the system with new brake fluid anyway. It's cheap and it's also part of the only and single most important system in the car that's letting you stop the car, lol. So uh, yeah, it's kind of important to keep that running/performing at it's best.

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