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Brake fluid turns black

Thread in 'Brakes' started by DAVID FOX, Jan 5, 2019.

  1. DAVID FOX

    DAVID FOX Member V6 Engine

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    Hi All,

    I have noticed lately that my brake fluid turned black.
    I recently flushed it and replaced with new fluid.
    What do I need to replace to remedy this issue?
    I am considering the rubber brake hoses and master cylinder...
    My Truck is a 2002 and has 156,000 miles on it
    Rotors and brake pads are all new as well
    please advise

    thanks
    Dave
     
  2. EddieS'04

    EddieS'04 Well-Known Member 1st Gen Owner 2 Wheel Drive V6 Engine

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    Are you saying the fresh fluid has turned black?
     
  3. DAVID FOX

    DAVID FOX Member V6 Engine

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    Hi EddieS'04

    Yes, I flushed it a few months ago and now it is dark again.
     
  4. EddieS'04

    EddieS'04 Well-Known Member 1st Gen Owner 2 Wheel Drive V6 Engine

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    Being that the fluid only flows one way, towards the anti-lock module and brake calipers. I would tend to wonder if the master-cylinder cups are breaking down. Just thought though.
    I have never had fluid turn black. If it is the master-cylinder. You might want to arbitrarly replace it. 156k miles is alot of service life. You might get ahead of an emergency.
    If you do replace it get the alluminum one. It has an anodized finnish in the barrel, were the fluid contacts it. The cast iron ones can internaly rust from moisture assorbed by fluid.
    It was years ago an another ford. All my parts stores only had the cast iron replacements. So I took mine apart. the barrell was in excelent shape. So I bought a rebuilders kit. My original issue was the booster, but since it had 90k on it. I was going to do a complete job.
     
  5. DAVID FOX

    DAVID FOX Member V6 Engine

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  6. DAVID FOX

    DAVID FOX Member V6 Engine

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    Hi EddieS'04

    Thanks for the input! I think I will just replace the master cylinder.
    I was thinking that it must be the rubber seals inside of it that are failing. I tow a camping trailer so I would rather be safe and have a new one in there.

    thanks again,
    Dave
    02 Sport Trac
     
  7. DAVID FOX

    DAVID FOX Member V6 Engine

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    Update on Master Cylinder
    I replace MC and it works great now!
    The car was mainly using front brakes for stopping...
    It must have been this way for a while as I had to replace front disc pads early
    I guess the black fluid was a failed seal on the rear brake side of the MC
    Sometimes front tire would lock up from hard stop, now all 4 wheels help
    This was well worth the time to replace and it was under $80 at Autozone
     
    Todd Z likes this.
  8. EddieS'04

    EddieS'04 Well-Known Member 1st Gen Owner 2 Wheel Drive V6 Engine

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    :):)
     
    Todd Z likes this.

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