Question about 1989 Ford Bronco

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Replaced master cylinder as per ginko's advice when installed the pedal went to the floor and stuck. what is the next step

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  • wakanasi Oct 07, 2009

    do you have a picture to show me where the slave cylinder needs to be bled There are two lines into the master front is larger also is the bleeding done with the engine running

  • wakanasi Oct 07, 2009

    It is an 88 bronco II brake system I m talking about

  • wakanasi Oct 07, 2009

    I dont understand the solution you sent me I have brake problems on a 1988 Bronco II. I replaced the master cylinder (brake) and the pedal stuck down with engine started. What next?

  • wakanasi Oct 07, 2009

    I replaced the brake master cylinder on my 1988 Bronco II as per Ginko's advice/ When the engine was started the pedal went to the floor and stuck

  • wakanasi Oct 07, 2009

    I prefilled the master cylinder until fluid without bubbles came out of ports. I tried bleeding the master cylinder again after it wouldnt work but no fluid is coming out the ports at all.
    the pedal goes down with almost no resistance and can be pulled up with some force. Did your statement about taking the cylinder back mean it might be defective or did you mean that it was not the problem


  • wakanasi Oct 07, 2009

    there is fluid in the cylinder . I have tried to bleed it with and without the engine running. The pedal goes down with very little resistance and requires some pressure to pull up. When the engine is running the pedal goes with no resistance and has to be pulled up. what next?

  • wakanasi Oct 07, 2009

    I have pulled the new master cylinder back off the car and checked the distance into the cylinder the required shaft length appears to be exactly the same. when I tried to bench prime the m cylinder, the front had flow and the back did not. on the old cylinder both had flow. any thoughts

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  • Ford Master
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I want to say return that master cylinder. But you should have had brake fluid in the master cylinder and even an airlock would provide resistence.
Now you can try opening a bleeder if the master cylinder has one and let it vent. The pedal should return. If there is no bleeder on the master, then open the brake lines at the master and let it vent that way.

You need someone to press the brake pedal while you open the lines or bleeders.

If you have no help, take off the master and try to work the fluid into its lower chamber and reinstall. Fill it with fluid and then bleed the lower lines.

Posted on Oct 07, 2009

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  • fordexpert Oct 07, 2009

    It sounds like the master cylinder you have is defective. Reading from your response it sounds like you primed the master cylinder properly.



    There is a rod in the brake booster area and this is adjustable. I don't think it is that far off. It is just meant to adjust for some play before the booster catches. But the rod could have slipped and is binding.



    When you cracked open the lines you should be able to get the master to move both ways with a fluid resistence. The bleeder on the housing can be opened to work an airlock out.



    I see a second message from Fixya but don't know if it is yours yet. Moving on to see.

  • fordexpert Oct 07, 2009

    Second reading- The pedal will go down if there is air in the lines. You need to bleed the brakelines once you are sure you are moving brake fluid out of the master cylinder. Your pedal should return up on its own.



    You may want the booster to work while you do this. However, as I wrote be sure the brake rod that comes from the booster is still in position. The booster may need the engine to run to reset the pedal.



    Do not know what your available tools are. Lately I have been using a vacuum pump with a brake bleeder kit on it to do all my brakes. You can do a good job by yourself and the excess fluid goes in a container and not on the floor. It would also fit any bleeder on the master cylinder case.



    Let me know if you are making progress.

  • fordexpert Oct 07, 2009

    The new cylinder sounds like it is defective. I am not familiar with Ginko but you can call Autozone and Oreillys and ask what parts they show for your Bronco. You should have return flow so the pedal will come back.

    I have not heard of brakes even without power assist working like your new one. When you had the brake problem in the first place, what was it doing?

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  • Master
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Hi
You must bleed the system . fill the clutch master cylinder with dot 3 brake fluid and keep an eye on it when bleeding so it wont run out ,have someone pump clutch pedal 3 times and hold to floor and oper bleeder valve on clutch slave cylinder till no air comes out then go to clutch damper and do the same ,follow clutch line from clutch master cylinder to damper.
Thanks for contacting Fixya.com

Posted on Oct 07, 2009

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