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Technical Brake goes to floor when started

Discussion in 'The Hokey Ass Message Board' started by Hyfire, Oct 10, 2018.

  1. Hyfire
    Joined: Jun 18, 2004
    Posts: 1,232


    I’ve got an issue with my 1955 Chrysler 300. The pedal is hard as a rock when the engine isn’t running, but nearly goes to the floor as soon as the engine starts. Bleeding it doesn’t seem to do anything.

    Any ideas????

    Thanks guys!


  2. s55mercury66
    Joined: Jul 6, 2009
    Posts: 3,249

    from SW Wyoming

    I think your power assist is applying enough force to overcome something marginal in your system. If it is not leaving a puddle somewhere, my first check would be the master cylinder.
  3. Sheep Dip
    Joined: Dec 29, 2010
    Posts: 1,569

    Sheep Dip
    from Central Ca

    Pedal Rod/Booster Adjustment Correct/Checked?
    302GMC likes this.
  4. 4 wheel drum? Make sure they are properly adjusted, that almost always brings up a low pedal.
    Black_Sheep likes this.
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  5. 302GMC
    Joined: Dec 15, 2005
    Posts: 5,458

    from Idaho

    Free up all the linkage between the pedal, booster, & master … it might even fix itself once everything can move as intended.
  6. 26Troadster
    Joined: Nov 20, 2010
    Posts: 441

    from Texas

    is the peddle moving on it's own when you start the motor? i may be reading it wrong but had to ask.
  7. Hyfire
    Joined: Jun 18, 2004
    Posts: 1,232


    Thank you guys! I'm going to try all this tonight.

    I have no doubt the shoes need better adjustment. I'm also going to bleed everything again. Lastly, I'll check all and any linkage and/or adjustments. I appreciate the help! Fingers crossed!
    Joined: Dec 14, 2009
    Posts: 1,647


    Don’t adjust your push rods tight ( pedal to booster/ booster to master)
    You need 3/16 to 1/8 play
    Adjust your shoes so they just start to drag
    Check your pedal.

    Does the car stop or not?
    How are the brake with out the booster?
    Can you drive the car?
  9. KenC
    Joined: Sep 14, 2006
    Posts: 222


    Those brakes are difficult to adjust correctly without the special tool. Can be done, just takes a lot of time. That is especially true after shoes are changed or drums turned. More background info may help pinpoint the problem. The manual has a detailed 'no special tool' procedure. Follow it to the letter and they may come up. Normal 'bendix' brake procedure won't work.
  10. Center plane brakes? Read up on them a bit.

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