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Dodge ram brake pedal going to floor?

Discussion in 'Mechanic and Repair' started by MikeKle, May 19, 2009.

  1. MikeKle

    MikeKle LawnSite Platinum Member
    Messages: 4,253

    I was out working and the brakes were fine when we stopped at this house, then 30 minutes later when we are leaving the brake pedal felt real spongy, and it goes to the floor pretty easily, but it still stops the truck, pumping the brakes dont seem to work that well. The fluid level is fine in the truck? How could everything be fine one minute then it goes bad, what happened in those 30 minutes? I cant find any leaks anywhere either.Ayone have any ideas what this is? thanks
  2. htr4

    htr4 LawnSite Member
    Messages: 26

    Is the fluid fine in one side of the reservoir or both? There's two sections in the reservoir (front and back I believe). If you blew a brake line or wheel cylinder, that section of the reservoir will go dry and the other side will still have fluid to stop you. Look at every wheel and see if there's any fluid dripping anywhere. Also look at the inside of the brake drums and see if they look wet. What year is the truck?
  3. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    Sounds like the master cylinder is by-passing fluid with-in it's self if it's still full and there's no apparent leaks. With the engine off push the pedal as normal holding a slight pressure on it, If the pedal slowly goes to the floor replace the master cylinder.
  4. 4.3mudder

    4.3mudder LawnSite Silver Member
    Messages: 2,227

    Sounds like the master cylinder is going out. MIne is going out in my yota I have to double pump to get a firm pedal before I brake.
  5. MikeKle

    MikeKle LawnSite Platinum Member
    Messages: 4,253

    This is really weird, When I went to leave this morning, the brakes worked fine and for most of the day they worked just like they should, then towards the end of the day , it started going to the floor again! Yes both resovoirs are at the correct level and no leaks anywhere. I have been needing to put pads on it for awhile but have been putting it off, could this have something to do with it?
  6. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    In all likely hood no, I've seen pads worn to metal contact and the master not bleed down....
  7. topsites

    topsites LawnSite Fanatic
    Messages: 21,653

    The only other possibility is the ABS system is failing, but seeing how those things cost like $900 it might be
    cheaper to replace the Master Cylinder, but then we still don't know if that is the problem.


    I would bleed the brakes first, thoroughly.
    So thorough that all the dirty fluid is out of the system, and DIY so you can check for any type of BS down below.
    Probably take 2-3 quarts, maybe 4.

    Once that is done, check it again.
  8. bavaria-n

    bavaria-n LawnSite Member
    Messages: 131

    You need to replace the master cylinder.

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