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Master brake cylinder

Discussion in 'XJ Technical Chat' started by Plumper, Jul 7, 2019.

  1. Plumper

    Plumper Member

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    IMG_8230.JPG IMG_8231.JPG So I managed to get those screws out and when I looked inside I found this ugly mess, is that rubber piece suppose to look like that? And what's the best way to clean all that gunk out of there? I am planning on replacing the lines and doing a good brake clean over the winter but now that I found this I should clean it up a bit for the summer
     
  2. XJ550H

    XJ550H Well-Known Member Premium Member

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    clean it rebuild it
    that rubber thing mounts on cap should not be like that

    there is a recent post on doing this someone will provide a link
     
    Last edited: Jul 7, 2019
  3. StahlMaster

    StahlMaster Member

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    I had the same issue this past winter. Redid the MC and caliper. Cleaned everything up with my ultrasonic and rebuild kits.
     
  4. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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  5. Plumper

    Plumper Member

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    I did read that brake line thread and I am planning on switching to ss lines, the bike was braking fine but the sight glass is all messed up so you can't see the level I was just checking it out of curiosity to see how full it was and found that mess
     
  6. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    @chacal has replacement sightglasses (and everything else). Start a conversation with him.
     
  7. Plumper

    Plumper Member

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    Sweet I didn't know you could replace just the glass, I'll send a message to him found a pretty sweet little video on bleeding and replacing brake fluid so that pretty much answered my future questions seems pretty easy to do
     
  8. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    It is pretty straightforward. You have one of the easier systems to work on.
     
  9. tabaka45

    tabaka45 Well-Known Member

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    Unless you really like a hard feel I would not use stainless brake lines. I put them on my XJ700N when I completely rebuilt the front brakes and I don’t like the hard feel. They work well but I just don’t like the feel. My other bikes have standard lines, work just as well, but have a softer feel. I am not an aggressive rider so standard, softer feeling brakes work for me.
     
  10. Door dude

    Door dude Active Member Premium Member

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    Site glass replacement was easy for me and the sweet part was Len sent instructions
     
  11. Plumper

    Plumper Member

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    What do you mean by hard brake like it's hard to pull or to touchy? I don't mind how my brakes feel now with the old ones
     
  12. Plumper

    Plumper Member

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    IMG_8235.JPG Check these out, took it out of my 83 magna parts bike, looks like brand new on the inside and it fits perfectly on top my cylinder
     
  13. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Braided stainless lines won't expand when you apply the brakes. Rubber lines do, which give a softer feel (and reduces the maximum braking potential of the system). IMO if you ride anywhere near modern traffic you should upgrade to braided lines.

    They aren't hard to pull, or touchy. They just feel different because the lines aren't expanding as you pull the lever.
     
  14. Plumper

    Plumper Member

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    O ok, I'll give em a try see if I like em,
     
  15. Plumper

    Plumper Member

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    Dos the rear drum brake take brake fluid or just calipers
     
  16. XJ550H

    XJ550H Well-Known Member Premium Member

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    it is mechanical a rod runs to the pedal no fluid and it takes shoes if it is a drum

    I am guessing from handle bars and seat it is an 82 maxim
     
  17. Plumper

    Plumper Member

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    Yup it is 750
     
  18. Plumper

    Plumper Member

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    I was pretty sure there was no fluid but thought I'd check, thanx
     
  19. Plumper

    Plumper Member

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    I really didn't wanna ask this but Google didn't tell me, how full do I fill the cylinder? To the lower line or right full,
     
  20. XJ550H

    XJ550H Well-Known Member Premium Member

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    above the line enough so it does not spill out when cover and diaphragm is installed. but low enough so it should leave a little air bubble in the window so if you look at it when riding you see an air bubble and know you have fluid in there.

    no problem asking about the rear brake drum better to ask and learn

    this ain't FB we wont rag on you for not knowing
     

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