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Brake problem

Discussion in '40- & 55-Series Tech' started by 73lndcrsr, Feb 18, 2003.

  1. 73lndcrsr

    73lndcrsr SILVER Star

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    I have searched, but can't seem to find what i am looking for.

    I am helping a friend with a 70 FJ40. The brakes require 1.5 pumps before the pedal is firm. The master cylinder front reservoir moves down about 3/8". After the pedal is released the fluid level comes back to the top.

    We have re-built the master and new wheel cylinders.

    What else could it be?

    Thanks.
     
  2. wayne_fj40

    wayne_fj40

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    It sounds like there is still air in the line.
     
  3. 73lndcrsr

    73lndcrsr SILVER Star

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    I have bled them several times. I did get air except for the inital time bleeding the system (after working on the MC).

    I do not get air right now at all.

    How do I adjust the push rod properly?
     
  4. Erics75

    Erics75

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    How about your brake adjustment? They need to be adjusted manually and if they are far enough out of adjustment you will have to pump the pedal.
     
  5. 73lndcrsr

    73lndcrsr SILVER Star

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    I have adjusted them until there is some drag when you dpin the wheel.

    Any other suggestions?

    Thanks for all the help.
     
  6. wayne_fj40

    wayne_fj40

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    after you rebuilt the master cylinder did you bench bleed it? I'm running out of possable ideas.
     
  7. FJAfrica

    FJAfrica

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    To me this definately sounds like adjustment. The way I adjusted the brakes was to adjust them till they were tight, then depress the pedal a few times, then back them off till they just start to drag.

    Also make sure the rod from the pedal to the mc has sufficient slack to allow the mc piston to return all the way.