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Author Topic: Single disc MC with two discs?  (Read 1314 times)

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Greg

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Single disc MC with two discs?
« on: September 06, 2005, 02:26:57 PM »
someone ran over the front end of my 76 750f.  now i am going to replace it with the front end (clamps, forks, wheels, calipers, and rotors) from my 77 parts bike (which has dual front disk brakes.  is it a problem to use a MC from a single disc brake bike with two calipers/rotors?
Thanks guys!
greg
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Offline MikeDeB

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Re: Single disc MC with two discs?
« Reply #1 on: September 06, 2005, 02:31:53 PM »
Yep.  Look for an early Goldwing master cylinder.  The master cylinder for a single disc just doesn't have enough umph for two discs.  There is a formula for calculating the piston size required for the MC based on the size of the pistons in the calipers.  I don't know the formula off the top of my head but I do know that the single disc MC falls short.
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Mike (Old SOHC/4 #2641)
Holt, MI
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Greg

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Re: Single disc MC with two discs?
« Reply #2 on: September 06, 2005, 02:40:05 PM »
ok, cool.  thanks for the info
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Offline kghost

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Re: Single disc MC with two discs?
« Reply #3 on: September 06, 2005, 03:06:29 PM »
I gotta disagree.

The master cylinder piston on my Goldwing is exactly the same bore and stroke as my 72 750 with only one disc.

Which oddly enough is the same bore and stoke as the master cylinder on my F2 750.

Now the resevoir on the Gold wing holds more fluid........

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eldar

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Re: Single disc MC with two discs?
« Reply #4 on: September 06, 2005, 03:45:23 PM »
I have heard it being done with a 1 disk master. BUT it supposedly requires more maintenance. If you use a 1 disker, get braided brake lines, these are good anyways. Make sure the piston in both the calipers AND master are clean and seal well. Make sure the housing for the pistons is spotless.
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