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  1. #1

    stuck piston in rear master cylinder

    I have got out a rear master cylinder from a pop up that has been sitting around for years,pulled it apart but the piston is stuck in there. Tried blowing out with compressor but doesn't budge.
    Any ideas to get it out would be appreciated.
    Cheers.
    Last edited by davegw; 01-05-19 at 06:32 PM. Reason: misspelled words.

  2. #2
    What an abnormal fixation! Being unable to remove even with compressor.

  3. #3
    Senior Member NSW murf's Avatar
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    Grease nipple in the bleeder hole and use a grease gun Cheers Murf
    Learn the rules so you know how to break them properly

  4. #4
    Senior Member QLD muddy's Avatar
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    That is clever. I was trying to think how to use some form of hydraulic pressure, but could not think of something easy.

  5. #5
    Same principle if you've got a stuck piston in your brake calliper. And then a total bastard to clean up afterwards (about a can and a half of degreaser.......)
    Gone riding!

  6. #6
    Compressed air - 120psi, and blown ear drums/lost fingers when it breaks fee and shoots across the room.
    Grease Gun - up to 6,000psi and a bit of mess to clean up.

  7. #7
    I think it has been in there for a long time, all dried out and it is the rear master cylinder, so not sure where I could use a grease gun not that I have one. Tried using the air through the banjo bolt opening and through the plastic elbow where the reservoir hose goes to.

  8. #8
    Quote Originally Posted by davegw View Post
    I think it has been in there for a long time, all dried out and it is the rear master cylinder, so not sure where I could use a grease gun not that I have one. Tried using the air through the banjo bolt opening and through the plastic elbow where the reservoir hose goes to.
    Without seeing it I can think of an issue.
    You won’t get much pressure in that chamber as you’ve stated, you have a banjo bolt hole and a plastic elbow. You have to block one and get the pressure in the other and the elbow will be a weak link either way.
    Is the banjo bolt hole at the top of the cylinder?
    Could you put a drift in there and knock it, or press it out?
    Boogieman (NBT, NSRL, ATMUPN, ROK)
    I wish I had as many cc's as posts!

  9. #9
    Quote Originally Posted by Boogieman View Post
    Without seeing it I can think of an issue.
    You won’t get much pressure in that chamber as you’ve stated, you have a banjo bolt hole and a plastic elbow. You have to block one and get the pressure in the other and the elbow will be a weak link either way.
    Is the banjo bolt hole at the top of the cylinder?
    Could you put a drift in there and knock it, or press it out?

    I think I found a pic of one and it doesn’t look like my idea would work.
    The next option is to remove the elbow and blank the inlet.
    Then you can hook up a front master cylinder and pump it out.
    Boogieman (NBT, NSRL, ATMUPN, ROK)
    I wish I had as many cc's as posts!

  10. #10
    Senior Member QLD
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    Drop it in a bucket of Diesel for a day and bobs your uncle.

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