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DAMN IT !!!! NO BRAKES

Discussion in 'Wrangler TJ (1996-2006)' started by Adam39601, Sep 2, 2018.

  1. Sep 2, 2018 at 4:20 PM
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    Adam39601

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    Adam39601 [OP] Well-Known Member

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    Ok here we go i changed my front rotors calipers and pads an flex lines. I blead the lines pumped the lines till no air In lines on both sides. When I push on brakes I get pressure, but when I turn on the motor I loose pressure help please.and the break light stays on with a full reservoir
     
    Last edited: Sep 2, 2018
    Adam39601, Sep 2, 2018
    #1
  2. Sep 2, 2018 at 5:56 PM
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    chris4x4

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    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Oh man...I hate brakes, but subbed to find an answer.
     
    chris4x4, Sep 2, 2018
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  3. Sep 2, 2018 at 9:04 PM
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    aggrex

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    aggrex Well-Known Member

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    Might want to check the brake fluid level in the master cylinder then look for external leaks from brake lines(rusty?/weeping?), calipers and wheel cylinders. Brake fluid contaminated? Hopefully its not the master cylinder as it can be worn and leaking.
     
    aggrex, Sep 2, 2018
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  4. Sep 3, 2018 at 5:56 AM
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    dougbbbb

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    dougbbbb Well-Known Member

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    Are the calipers on the correct side? Bleeders should be at the highest point. Also try gravity bleeding the front calipers sometimes air gets back in the rear cylinder by leaving the valve open too long.

    Doug
     
    dougbbbb, Sep 3, 2018
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  5. Sep 3, 2018 at 8:17 AM
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    Adam39601

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    Adam39601 [OP] Well-Known Member

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    Have checked an done all of that still no psi when motor is on
     
    Adam39601, Sep 3, 2018
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  6. Sep 4, 2018 at 10:13 AM
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    Awrench

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    Awrench Well-Known Member

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    brake light stays ON - yellow or red light?
    Do you have ABS?
     
    Awrench, Sep 4, 2018
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  7. Sep 4, 2018 at 2:52 PM
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    Adam39601

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    Adam39601 [OP] Well-Known Member

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    Adam39601, Sep 4, 2018
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  8. Sep 4, 2018 at 6:03 PM
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    Drd88

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    Drd88 Active Member

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    Check proportioning valve
     
    Drd88, Sep 4, 2018
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  9. Sep 4, 2018 at 7:08 PM
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    JKBob 25

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    JKBob 25 Well-Known Member

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    Subbed too. Numerous fixes posted up top. Drastic and sudden loss of pressure. Usually a sign of a leak some where. My experience....Usually at a wheel cylinder. Check for fluid on the inside of tire and rim. Just a thought.
     
    JKBob 25, Sep 4, 2018
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  10. Sep 7, 2018 at 6:01 AM
    #10
    OFFGRID

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    OFFGRID Well-Known Member

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    Did you by any chance change install a new master cylinder too, if so did you bench bleed it before installing it? Are you vacuum boost or Hydraulic (Im not sure which year is which) Look for a vacuum leak if vacuum boosted.
     
    OFFGRID, Sep 7, 2018
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  11. Sep 7, 2018 at 12:32 PM
    #11
    Prerunner1982

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    Prerunner1982 Well-Known Member

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    Did you bleed the back brakes too?
    Still sounds like you have air in the lines to me.

    The Brake warning light is likely the proportioning valve, either it has failed or is sensing a bias in pressure. This is why I asked if you bleed the rear brakes as well.
    If not try bleeding the rears also and see if it helps your pedal pressure and turns the brake warning light off.

    How are you bleeding your brakes?

    I have great success doing it by myself by loosening the bleeder valve, putting a hose over it and then putting the other end of the hose in a small container of brake fluid. Slowly pump the pedal 3-5 times. Hand tighten the bleeder before removing the hose, remove hose and tighten bleeder valve with wrench.
    Start are Right Rear, then Left Rear, Right Front and then Left Front.
    Keep brake fluid topped off during the process.
     
    Last edited: Sep 7, 2018
    Prerunner1982, Sep 7, 2018
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