1. Some members were not receiving emails sent from XJbikes.com. For example: "Forgot your password?" function to reset your password would not send email to some members. I believe this has been resolved now. Please use "Contact Us" form (see page footer link) if you still have email issues. SnoSheriff

    Hello Guest. You have limited privileges and you can't "SEARCH" the forums. Please "Log In" or "Sign Up" for additional functionality. Click HERE to proceed.

Looking for '84 XJ1100 rear brake opinions

Discussion in 'XJ Technical Chat' started by Brad Nimbus, Jun 14, 2022.

  1. Brad Nimbus

    Brad Nimbus New Member

    Messages:
    12
    Likes Received:
    1
    Trophy Points:
    3
    Location:
    Edmonton
    Hello everyone. I got a little overzealous in my efforts of de-linking my front and rear brakes and snapped the line that runs from the proportioning valve to the master cylinder. I didn't think it was a big deal because I wanted to delete the proportioning valve and its housing anyway but my plan of of using the original bolt quickly fell apart when I realized it was a different size/thread!

    Before I do something dumber, I'd appreciate opinions on my options. Sometimes I get carried away making things work without considering safety and longevity.

    Could I just chase the threads in the housing and use my existing banjo bolt shortened or with an overgrown "washer"?

    Does such an adapter exist that would allow me to reuse that banjo bolt with that housing?

    Should I just find a different master cylinder housing?


    I'd really prefer NOT having linked brakes on this bike but I'd still like to ensure that my brakes function properly.

    Thank you for your time and wisdom

    ~Brad
     

    Attached Files:

  2. Brad Nimbus

    Brad Nimbus New Member

    Messages:
    12
    Likes Received:
    1
    Trophy Points:
    3
    Location:
    Edmonton
    Or maybe something like this?
     

    Attached Files:

  3. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

    Messages:
    9,175
    Likes Received:
    1,978
    Trophy Points:
    113
    Location:
    The room where it happened
    We have that prop valve metal line available if you wish to consider that as a solution. The linked brake system works pretty well when everything is actually working properly. I think the prop valve can be disassmbled and the plunger removed, and the input port (from the front line) plugged, thus disabling it (i.e. rear master cylinder does all the work on the rear caliper).

    You'll then have to make a brake line to go from the front m/c to the LH front caliper, and run it up to the front m/c and use a double-depth union bolt at the master cylinder (that will accept both front brake lines).

    BUT.........that front m/c is sized to control just a single front caliper, and now you'd be trying to power both front calipers....won't work very well....which means you need a bigger -bore front m/c, and with those special handlebars, you need a "tilted reservoir" front m/c, and the only "tilted" front m/c that has a larger bore AND a provision for the brake fluid level sensor is the one used on the 1982 XJ750 Maxim models.

    BTW, nice duck!
     
    Brad Nimbus and ksigurdsen like this.
  4. Brad Nimbus

    Brad Nimbus New Member

    Messages:
    12
    Likes Received:
    1
    Trophy Points:
    3
    Location:
    Edmonton

    Thank you so much for your response! I really appreciate it and wanted to make sure I took the time to thank you. I have a replacement line that I'll use in the interim. The prop valve looked like crap so that's in the junk pile. You really lined up what I need to do and that's awesome. Barring any blunders, I should have rear brakes today!

    When you say that the front master cylinder won't be enough to power both calipers, what exactly do you mean? Will it be as I suspect and require twice as much physical pressure to haul the lever or will it just not have enough "juice" at all?


    That's Gon Goose, lol. He was an assisted hatch because he was weak and had bad legs. His siblings went on to their new home and he spent the next week with me lifting him an inch or two off the ground to help strengthen his legs. I dropped him off with his siblings the following week and he had no interest in leaving me, lol. He hopped back in my car with me and has been by my side ever since, lol.
     
  5. k-moe

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

    Messages:
    19,647
    Likes Received:
    6,756
    Trophy Points:
    113
    Location:
    The City of Seven Hills
    You will have to pull the lever harder, and won't get as much braking power as with the linked system. Basically you're shortening the lever that controls the brakes by half. A decent analogue is trying to break free a lug nut on a truck by using a 12" long breaker bar instead of a 24" breaker bar. It might work, but you'll be expending a lot more effort than is necessary.
     
    Brad Nimbus likes this.
  6. Brad Nimbus

    Brad Nimbus New Member

    Messages:
    12
    Likes Received:
    1
    Trophy Points:
    3
    Location:
    Edmonton
    Thanks, man! I don't know why I expected a 40 year old master cylinder to work properly. It went together nicely but is leaking through the plunger and hauling air. Finding the proper replacement kit is incredibly frustrating! I'm tempted to start dipping into the aftermarket, lol
     

    Attached Files:

  7. k-moe

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

    Messages:
    19,647
    Likes Received:
    6,756
    Trophy Points:
    113
    Location:
    The City of Seven Hills
    Unless his stock is depleted, @chacal has the correct rebuild kit.
     
  8. Brad Nimbus

    Brad Nimbus New Member

    Messages:
    12
    Likes Received:
    1
    Trophy Points:
    3
    Location:
    Edmonton
    I'll send him a message. I waited a week to hear back from FORTNINE who gave me incorrect information :mad:
     
  9. k-moe

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

    Messages:
    19,647
    Likes Received:
    6,756
    Trophy Points:
    113
    Location:
    The City of Seven Hills
    Fortnine as in the YouTube guy?
     
  10. Brad Nimbus

    Brad Nimbus New Member

    Messages:
    12
    Likes Received:
    1
    Trophy Points:
    3
    Location:
    Edmonton
    Hahaha, no. fortnine.ca! Seriously though, is it this difficult to find the correct replacement parts? Is there a compatible rear master cylinder earlier/later in the Yamaha model range where I can just swap and not have to take it in the rear end every two years to find replacements? XS1100 M/C rebuild kits are cheaper and can be found everywhere, would an XS1100 master cylinder bolt up to my frame? A Virago M/C?

    Here's a pic of my grumpy bike:
     

    Attached Files:

  11. Brad Nimbus

    Brad Nimbus New Member

    Messages:
    12
    Likes Received:
    1
    Trophy Points:
    3
    Location:
    Edmonton
    Here's what I'm thinking of adapting to fit.
     

    Attached Files:

  12. k-moe

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

    Messages:
    19,647
    Likes Received:
    6,756
    Trophy Points:
    113
    Location:
    The City of Seven Hills
    Well @chacal generally responds the same week, often the same day, and sometimes even the same hour. Parts also show up sooner than estimated.
    He will also know about what other models have rear masers that will work.
     
  13. Brad Nimbus

    Brad Nimbus New Member

    Messages:
    12
    Likes Received:
    1
    Trophy Points:
    3
    Location:
    Edmonton
    He has a great reputation and has been recommended several times. Unfortunately, he appears to be literally the only person in the universe who stocks the rubber parts needed to repair my master cylinder and that concerns my long term plans for my bike. Please understand, that's not because of Chacal or anything related to this site but because of my own anxiety and previous experiences. I'll be sure to recommend him to new members who need oem style replacements. :)

    Just an example of how things work for me because my beloved i7 2600k comes to mind. It can still compete with processors 12 years later but was forced into obsolescence due to an obscure chipset which caused the price of even mediocre motherboards to absolutely sky rocket in price!

    If my aftermarket hillbilly fix works, I'll make sure the oem M/C housing goes to a good home
     
  14. Brad Nimbus

    Brad Nimbus New Member

    Messages:
    12
    Likes Received:
    1
    Trophy Points:
    3
    Location:
    Edmonton
    I finally swapped the brake lines in the front. I used a "T" and braided steel brake lines I found on Amazon and connected both calipers to the factory front master cylinder. It works great and lever feel is where I like it. Just for giggles I had another go at the factory rear master cylinder. It actually works now, even with the crappy rubber line!
     

    Attached Files:

Share This Page