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Master cylinder pushrod.

Discussion in 'Steering, brakes & Suspension' started by Winged, Dec 5, 2018.

  1. Winged

    Winged Member

    Messages:
    185
    Location:
    Huon Valley
    Could my master cylinder be failing without leaking? After a year off the road both rear wheel cylinders needed replacing and have been bled. Bled fine but still no pedal!! Is it probable that the pushrod (if master cylinder has a pushrod??) has failed but the lines remain intact? Thus i have enough thrust to move fluid in a open system (ie bleeding) but not against the resistance of a closed system. Am i barking up the right tree?
    Cheers for any advice
     
  2. cbus

    cbus Well-Known Member

    Messages:
    10,921
    Location:
    sunshine coast
    Quite possible that the internal seal is stuffed.
    Or it has some crap preventing a good seal.
    Another area that can give a soft pedal is the flexible lines can stretch under pressure when old.
     
    Mordred likes this.
  3. Mordred

    Mordred Super Moderator Staff Member

    Messages:
    2,705
    Location:
    Penna, Hobart
    Also have you followed the correct procedure for bleeding the lines including tightening the bleed valve before letting the pedal up? I had trouble when I did them in the opposite order to the manual and couldn't get pedal then did it the way it was in the bentley and all good. Start at right front the left front then right rear then left rear. Don't know why it matters so much but I had problems until I did it this way.

    Adrian
     
    David H likes this.
  4. Winged

    Winged Member

    Messages:
    185
    Location:
    Huon Valley
    Hi, tried to bleed lines again. Just solid fluid from the word go, no air. Pedal will pump up to apply some (very little) brake but then fades to the floor.
    Will give a new master a go. My flexible lines are 4 years old but dont look bad at all. Any advice to bear in mind when changing the master cylinder?
    Thanks
     
    Mordred likes this.

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