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  1. #1

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    May 2019
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    Default Left side brake rear disc conversion on a 74 sportster

    Seen a few Right side ones but no left side ones at all. Anyone have a pic or a link to share?

  2. #2
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    Quote Originally Posted by tictoc View Post
    Seen a few Right side ones but no left side ones at all. Anyone have a pic or a link to share?
    Have you thought about why you haven't seen any????????

  3. #3

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    May 2019
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    Maybe I did not Clarify enough. The 74 uses a Left Side brake foot pedal Right side shift. Have not seen one setup for disc brake yet.
    Look for pictures or some other setup ideas.

  4. #4

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    This can be done by welding a lever to the pedal itself to actuate a master cylinder. In that case the cross shaft is just a pivot. Or, shorten the cross shaft lever on the right side and attach a link for the master cylinder. The problem there is that the chain is kinda in the way.

    Jim

  5. #5

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    Ahhh that makes sense. Will probably go with the direct pedal to master cylinder, will need to find a spot to mount it, then a new rear disc wheel and some caliper. Thanks!!

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    One way to convert an Ironhead Sportster from drum to disc brake
    This 1974 left side brake XLH
    needed more stopping power.

    With the GMA master cylinder mounted. The plunger is from a 70-79 FLH. It is accuated by an L bracket under the bolt that cinches the brake pedal to the shaft. Brake light switch is screwed into a banjo bolt adapter.
    Click image for larger version. 

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    http://www.ny1e.com/irondisc.htm

  7. #7

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    Quote Originally Posted by TriNortchopz View Post
    One way to convert an Ironhead Sportster from drum to disc brake
    This 1974 left side brake XLH
    needed more stopping power.

    With the GMA master cylinder mounted. The plunger is from a 70-79 FLH. It is accuated by an L bracket under the bolt that cinches the brake pedal to the shaft. Brake light switch is screwed into a banjo bolt adapter.
    Click image for larger version. 

Name:	iron6.JPG 
Views:	5 
Size:	32.5 KB 
ID:	102388

    http://www.ny1e.com/irondisc.htm
    Mounting brake parts (or anything really) below the lower frame rail is extremely bad practice. Much better to have the lever above the pivot, and a bellcrank at the master cylinder. But yes, that pic shows the general idea.

    Jim

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    You can orient a master cylinder in any position if the reservoir is remote or you just use a section of clear tubing like the sport bike guys (did tubing with my FXR using a bagger round master cylinder, no pics at moment because bike disassembled) for the reservoir. The traditional horizontal mounting is purely for layout convenience and use with integral reservoirs.

    I got the idea from this post:

    http://www.chopcult.com/forum/showthread.php?t=1285

  9. #9

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    May 2019
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    What about a rear wheel? What years will work? I run a 16" laced wheel 3/4 axle and found a few with rotor and pulley drive which I think you can just convert just not sure.

  10. #10
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    Any 3/4" HD axle rear should bolt on with some axle spacer fiddling.

    Line up wheel sprocket with transmission sprocket (belts have pulleys but you can bolt sprockets to their place on the wheel) since that's mandatory, then sort out your choice of caliper mount. The plain flat plate aftermarket style mount are the most versatile.

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