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Christopher DMon Jan-30-06 05:36 PM
Member since Mar 18th 2009
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"Second disk brake"


  

          

Does anybody knows if mounting a second front disk brake is possible on my 1975 Commando 850 MK3 ? If yes, does it really improve the brake efficacity ? If not, is there another solution to get a better brake feeling ? Thanks in advance for your responses.

  

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but I am tprWed Mar-05-03 04:56 PM

  
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Mon Jan-30-06 05:36 PM by webmaster

  

          

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DARREN JEFFERYThu Mar-06-03 05:12 AM

  
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DerekSat Mar-15-03 04:05 PM
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#3. "RE: Second disk brake"
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Probably the most cost efficient way to improve your front brake is to change you master cylinder bore from 5/8" to 1/2". The 1/2" m/c will decrease your lever effort by about 35%, while generating the same hydraulic pressure.
This can be achieved in a couple of ways:
1. Because you have a Mk3, you probably want to keep your right hand switch gear stock. I have heard through the grapevine that there is a kit you can get to sleeve your stock master cylinder, although have never personnaly seen one my self. Anybody know?

2. What I did on my '72 was go down to the local motorcycle wrecking yard and bought a used m/c off of Kawasaki ZX-7. It has a better lever ratio than the stocker, and also has a 4-position lever adjuster. I didn't need my RH swith gear, as I switched to a Yamaha XS650 LH switch that incorporates the turn signals (push-to-cancel), horn, and hi-lo beam switch. We have planned the same treatment for my dad's '74 850 using another Kawa m/c (not sure what model it's from) and retaining the stock RH switchgear by using a cut-down, broken clutch perch as a dummy back cover.

Other m/c's will probably work, just make sure that they have "1/2" embossed somewhere one the body.

HTH,

Derek

  

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dynodaveThu Feb-02-06 07:30 AM
Member since Mar 18th 2009
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#4. "RE: useable disk brake"
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The master cylinder conversion is probably most commonly done to 13mm.
This is a tad bigger than 1/2", and the imperial 1/2" may be tougher to find.
The RGM conversion kit is (IIRC) 13mm. They will also install it for you on your M/C.
This is by far the most cost effective way to get a reasonable front brake and not do a costly and complete appearance change on the bike.

  

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