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How do you remove the rear master cylinder on a 06 Mastiff?

Discussion in 'Help Wanted' started by scteach, Dec 2, 2017.

  1. scteach

    scteach Member

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    My rear master cylinder is leaking bad and I need to remove and most likely rebuild. Can anyone tell me what all is involved in removing the rear master cylinder. It appears that I may need to remove the exhaust to get to one of the bolts but want to hear from you before I may do more work than needed. Thank you in advance.
     
  2. dentdude36

    dentdude36 Guru

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    I rebuilt the one on my pitbull it does not need to be removed from the bike it's pretty simple to do takes longer to bleed the brake get yourself a speed bleeder it makes it much easier
     
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  3. dentdude36

    dentdude36 Guru

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    Donna and Derek sell rebuild kits , remove the snap ring pull the parts out clean really well and put new spring seals plunger etc in and make sure you use dot 5 fluid
     
  4. scteach

    scteach Member

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    Thank you, I will do all that. However my question is what is are the steps to remove the master cylinder from the bike. Does the exhaust pipes need to come off?
     
  5. dentdude36

    dentdude36 Guru

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    Not sure never took mine off as stated I rebuilt it on the bike no reason to remove it in my case
     
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  6. scteach

    scteach Member

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    Thanks, my cylinder leaks behind where it mates with the mount. No leaks at plunger rod or line. Need to remove from bike by after removing one bolt it still will not come off. I see the other bolt but it does not appear to hold to the mount and I will need to remove the lower pipe to get that bolt out.
     
  7. scteach

    scteach Member

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    Thank you. I will take another look. I guess you rebuilt on bike by removing plunger. The odd thing is my leak is coming from between the cylinder and the mount. All dry around the line and plunger. That is why I figured I would need to remove it for repair. A picture of one removed showing the back side would be helpful.
     
  8. Th3InfamousI

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    Behind the mount? Sure it's not leaking at the crush washer underneath where the brake line connects? There isn't anything to leak on the back side near the mount.

    Sent from my 2PS64 using Tapatalk
     
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  9. dentdude36

    dentdude36 Guru

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    The fluid may be traveling if the rebuild doesn't work then the other possibility is your reservoir or control is cracked highly unlikely but is a possibility
     
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  10. scteach

    scteach Member

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    100% sure not coming from the line or where it connects. And yes, right where the cylinder sandwiches with the mount is where the fluid is coming from. Front by plunger and line is dry. I found it odd as well and thought there may be a weep hole back there.
     
  11. Th3InfamousI

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    No weep hole....would have to be leaking out of the gasket at the top where the cover is...

    But it's just the two bolts that hold on the control take those out and you can swing it around.

    [​IMG]

    Sent from my 2PS64 using Tapatalk
     
  12. scteach

    scteach Member

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    I will say that the bike sat all summer with no riding and when I did my pre ride check the rear brakes were not working. I removed the cylinder cover and bone dry. As I poured new "DOT 5" fluid in, it began to leak where I stated.
     
  13. Th3InfamousI

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    Take pics when you take it off..like Kevin said it could be cracked but it's damn beefy I don't know how that would happen

    Sent from my 2PS64 using Tapatalk
     
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  14. scteach

    scteach Member

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  15. scteach

    scteach Member

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    If I get it off I will get some pics.
     
  16. Mr. Wright

    Mr. Wright Guru
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    I have a cracked one in my junk drawer. The one I have isn't repairable, but after you get it off, take a picture of where it is leaking, I might be able to fix it.
     
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  17. MBOYTE

    MBOYTE Member

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    I just noticed the exact same thing on my 04 chopper. Reservoir was empty, added fluid and bled the line, then noticed a drip from what sounds like the same location. Haven't had a chance to try and remove yet.
     
  18. scteach

    scteach Member

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    I hope to get some time this weekend to remove mine. If I do I will update on findings and try to add some pics. Please do the same if you beat me to the removal, and share how you got it off the bike, lol.
     
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  19. MBOYTE

    MBOYTE Member

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    I got my rebuild kit in and installed. Still a drip! I removed the cover and mine is cracked. This is gonna be pricey. Where can a guy pick up a new assembly?
     
  20. MBOYTE

    MBOYTE Member

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    2017-12-16_21.39.34.jpg 2017-12-16_21.41.36.jpg
    1st pic, you can see the crack.
    2nd pic, on my chopper there were 2 Allen head 5/16 holding the assembly to a mounting plate
     

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