Question about 1992 Ford F250

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Brake goes to floor with new mater cylinder question about power booster

Thanks to all who have helped me with this. Please tell me how the power booster could be related to the loss of pressure. There is vacuum at the booster and no obvious leaks. The pedal is hard when the truck is not running. As soon as it starts you can push the pedal to the floor. I don't understand how a problem with the booster has a relation to the plunger moving too far in the cylinder. Please explain as I could see if there is a problem with the booster that I would have a hard pedal but not soft. Thanks again. Reg.

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  • Anonymous Mar 14, 2014

    replaced vacuum power brake booster now brake pedal won't cume up

  • Anonymous Mar 19, 2014

    i got a f150 everytime i put the break paddle to the floor, and put the truck in gear. the truck is missing. what do i need to do, please help me to get rid out of this situation. thank you.

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If your pressure is good in till you start your truck it is the power booster. i just fixed this problem. If it is not your master then that is the problem. I had to replace the whole brake system to find this out.
Tim

Posted on Dec 18, 2008

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All a brake booster does is boost your peddal effort .
so it can not be related to your fluid pressure loss.
my question is are you loosing brake fluid?
its possible you have a bad master cyl or you need to bleed your brakes.
let me know if ya need more help
later
paul

Posted on Nov 01, 2008

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  • paul erickson
    paul erickson Nov 01, 2008

    also wanted to make a note that if your back brakes are not adjusted up .

    most of your brake fluid is going to the rear brakes just to make up for the brakes not being adjusted.

    that is where i would start after reading your previous post and the stupid answers you recieved.

    later paul

  • paul erickson
    paul erickson Nov 01, 2008

    just to give you an idea of what is inside you drums

    are your rear axels full floating?

  • paul erickson
    paul erickson Nov 01, 2008

    not sur if your familar with adjusting rear brakes but here is a good web site that covers it

    http://www.karlsgarage.com/xjpage/plug.j..." target="_blank" rel="nofollow" >how to adjust drum brakes

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