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Losing brake fluid

Discussion in 'Technical Chat' started by Ray07tacoma, Mar 18, 2011.

  1. Mar 18, 2011 at 10:45 AM
    #1
    Ray07tacoma

    Ray07tacoma [OP] Well-Known Member

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    turbo KN Filter 3" Lift Kit Rock Sliders TRD Skid plate ProComp 285/75R16 FJ Wheels w/ 265/70R17 Delay wiper switch
    4cyl, 5spd, 4x4, 86k miles.
    Have top off bake fluid in December then, a month/2000miles ago.
    Brake lites came on yesterday, ck fluid and it was at minimum again, so top it off again.
    Check for leak last month and again this morning, no wet spot or leak anywhere, master cylinder, wheels cylinders Frt/rear, no leak under clutch pedal. cannot find any sign of leaks
    Brakes works great but fluid useage does not seemed normal...
    any comments/suggestions??
     
  2. Mar 18, 2011 at 10:54 AM
    #2
    mjp2

    mjp2 Living vicariously though myself Staff Member

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    Brake fluid levels in the reservoir will drop as the pads wear, but what you're seeing sounds excessively fast.

    Did you follow the hard lines through your entire truck looking for leaks?
     
  3. Mar 18, 2011 at 11:00 AM
    #3
    BlueT

    BlueT Well-Known Member

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    Each brake cylinder has seal if one of them fails it will leak fluid, slowly but enough to make a level drop.
    You need to remove each wheel and apply brakes while truck is running to see leaks.
     
  4. Mar 18, 2011 at 11:36 AM
    #4
    Ray07tacoma

    Ray07tacoma [OP] Well-Known Member

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    Did follow the lines under truck and crawl under to visually inspect the back sideof rotor where the lines go in, and did not see and wet spot anywhere.
    I will have to take the wheels off to check each wheel cylinder, but I am skeptical as there is no sign of leak a all
     
  5. Apr 13, 2011 at 8:13 AM
    #5
    Ray07tacoma

    Ray07tacoma [OP] Well-Known Member

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    Well, finally found a wet spot in the cab under the clutch pedal.
    Brake Master cylinder Fluid reservoir also supply fluid to Clutch master cylinder, and that is the part that was loosing fluid.
    In this case the fluid was dripping behind the carpet, making it un-noticeable.
    Weekend project in the work.
     
  6. Apr 13, 2011 at 8:22 AM
    #6
    mjp2

    mjp2 Living vicariously though myself Staff Member

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    Nice find, and good luck on the repair! :thumbsup:
     
  7. Apr 23, 2013 at 1:26 PM
    #7
    Chuckracer

    Chuckracer Member

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    Thread Resurrection...looks like I may have the same problem with my '09 Standard Cab 4 banger 4x4...53,000 miles.

    How common is this?

    *edit* Apparently I have to replace my clutch master cylinder. Is this part rebuildable? Anybody done it? it can only be a leaking seal, right? :confused:
    Any of you wizards replaced that seal instead of the whole unit?
     
    Last edited: Apr 23, 2013
  8. Apr 24, 2013 at 6:42 AM
    #8
    Ray07tacoma

    Ray07tacoma [OP] Well-Known Member

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    It was a pain to get it back together.
    end up taking the pedal assembly in the cab apart to do it properly.
    Am sure that rebuild kit is available but not in local store, so replaced the unit.
     
  9. Apr 25, 2013 at 5:40 AM
    #9
    Chuckracer

    Chuckracer Member

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    Thanks Ray. After reading your description of the job, I think I'll let my local trusted garage handle it.

    Thanks!
     
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