Front caliper/master cylinder upgrade

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DaCs
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Front caliper/master cylinder upgrade

#1

Post by DaCs » Thu Jan 09, 2020 9:37 pm

Hi

Im upgrading front brakes with a 10" v-twin rotor and a performance machine single 2 piston brake caliper, what front master cylinder do you you recommend? I am looking for something simple, good and cheap that fits with the style of the panhead. Should the lines be of any specific measure?

Regards

Image
Image



RooDog
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Re: Front caliper/master cylinder upgrade

#2

Post by RooDog » Thu Jan 09, 2020 10:21 pm

Pictured is the Harley late Shovelhead, early Evo master cylinder I used on my Project Panhead. I rounded off the clamp portion for a smoother look. The important thing is to get a MC with a bore small enough to provide adequet pressure for your caliper. I used a 5/8" bore MC, after not being satisfied with the OEM 3/4" bore Shovelhead MC. Also a 10" rotor does not provide as much leverage as the 11.5" rotor, so you will need all the help you can get from the MC. You might also look into a 1/2" Sportster MC. I have never looked into anything other than HD parts, but I'm sure there are other MCs that would work, but do they fit 1" handlebars?
If you would like more pictures let me know and I will post some more....
....RooDog....
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DSC02580.JPG
DSC02580.JPG (104.65 KiB) Viewed 225 times

RooDog
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Re: Front caliper/master cylinder upgrade

#3

Post by RooDog » Thu Jan 09, 2020 10:26 pm

I use US A/N -3 aircraft sized fittings and flex line. These are standard aftermarket custom Harley catalog items....
....RD....

DaCs
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Re: Front caliper/master cylinder upgrade

#4

Post by DaCs » Thu Jan 09, 2020 11:27 pm

Thanks for the images, my main question is about a line that can be compatible with the master cylinder and the caliper. Some experiences you have had? Where I am living (Mexico) many lines are not so standardized, that is why I sometimes prefer to buy some compatible already armed to just connect.

Regards

RooDog
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Re: Front caliper/master cylinder upgrade

#5

Post by RooDog » Fri Jan 10, 2020 12:22 am

Lo siento.
The lines are standard US brake fittings, they are not metric. And as I said, are common in the catalogs for custom Harley parts. I can not help you where you are.....
....RooDog....

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Re: Front caliper/master cylinder upgrade

#6

Post by Scrap » Fri Jan 10, 2020 6:16 am

Make sure you match the master cylinder bore to the caliper. The bigger the bore, more fluid lower pressure, smaller bore, less fluid will travel to the caliper but will apply more pressure. I have a front PM caliper and use a shovel master cylinder. Measure the banjo bolt on the caliper. For example, my caliper banjo bolt is 12 mm and it calls for a 9/16" master cylinder bore. If you contact performance machine tech support they can tell you for sure what size master cylinder you should use for that particular caliper. I'm putting OEM style bars on with internal controls and I want to change out my MC with the intergral switch assembly and use something cleaner without the electrics. When you decide, please post a pic of what you chose. RooDogs looks pretty clean.
Sam

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Re: Front caliper/master cylinder upgrade

#7

Post by RooDog » Fri Jan 10, 2020 3:14 pm

Thank You, Sam....
Checking with PM is a great idea.

My Project Panhead uses an 11.5" disc, for better leverage, and a J-Brake 4 piston caliper. Sadly,they are now out of business. At first I used the stock Shovelhead 3/4 MC, but the lever pull was hard, and with less stopping power that I would have liked. I switched to the 5/8 bore MC, and now have a brake that will actually stop the bike, and with good lever feel too.
I chose the 1982-95 style of MC because I was able to adapt, modify, a Shovelhead lever to match my SH clutch lever. This all goes on a resto-mod scooter. Later model Evo/Twinkie MCs have a wider range of bore sizes and a more stylish fluid reservoir, but I couldn't adapt the earlier lever....
DSC02570.JPG
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The top lever is the stock Evo , came with the MC. The bottom one is stock Shovelhead, and the center shows the modified version, just a little file work makes it happen....

BTW: I also use the 5/8" bore MC on my Big Red Evo with dual GMA 4 piston calipers & 11.5 discs satisfactorily, but the 3/4 bore MC did work well on that particular set up too. It's all a mater of ratios, your results may vary....

In any case, use only DOT 5 fluid, it doesn't attract moisture, and pretty much lasts forever, in my humble experiences.
....RooDog....

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Re: Front caliper/master cylinder upgrade

#8

Post by Scrap » Fri Jan 10, 2020 5:06 pm

DaCs,
As you can see from RooDogs post, going to a smaller bore provided the extra pressure for that particular caliper. Nothing more important than a good front brake.
When making an emergency stop, 75-90% of the load is transferred to the front wheel, that's when you need a good front brake.
Sam

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Re: Front caliper/master cylinder upgrade

#9

Post by DaCs » Tue Jan 14, 2020 12:49 am

Thanks everybody I will try the 5/8 option.

Regards!!

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