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Old 08-03-2019, 05:37 PM   #1
FL55
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Default front master cylinder quesion

Hello all,

Can someone explain to me why there would be a problem running an 11/16 M/C for a single disc front brake?

thanks in advance
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Old 08-03-2019, 08:19 PM   #2
tomsoftail
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Default Re: front master cylinder quesion

Why would there be? I mean to say that I don't see a reason not to. Are you scared the bore is too big?
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Old 08-04-2019, 04:07 AM   #3
Ducbsa
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Default Re: front master cylinder quesion

This may give you some info: http://www.vintagebrake.com/mastercylinder.htm
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Old 08-07-2019, 08:27 PM   #4
FL55
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Default Re: front master cylinder quesion

I purchased a front disc springer setup from W&W for my panhead.

It includes spacer/mount to bolt the disc to the star hub and utilize the drum anchor point on the springer leg.

Per W&W it calls for a 12mm MC, I don't have one of those and would rather not spend the $300+ the boys from W&W want for theirs.

So I'm looking to utilize what I have.

To further complicate it, I prefer to mount it on the left hand side, where the drum brake lever was, so I was looking at the clutch MC setup.

Thoughts?
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Old 08-07-2019, 11:23 PM   #5
karl wolf
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Default Re: front master cylinder quesion

Think of the relative bore size bore of the master and slave.
If you run an 11/16" bore master cylinder, you will have to apply more force to brake than if you're running a 12mm bore m/c. (I could do the math , but sounds about double).
I would try it.

Using a m/c meant for a clutch- make sure that there's no residual pressure when the brake is released. The m/c used for brakes has a tiny hole to bleed off any pressure in the system when the handle is released. The clutch m/c may have that- or not. I don't have one to check.

Karl
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