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Old March 16th, 2017, 04:02 PM   #1
JiI
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Default brake MC size and stuff

Hey gang,
If you've seen in various threads here, I'm making a very different volksrod and I'm calculating the brakes right now. I could use your help on this. Here is the brake kit I just bought.
http://www.speedwaymotors.com/Speedw...pace,1999.html

And it is running these calipers
http://www.speedwaymotors.com/Emerge...pers,1968.html

It's running 2.02 dia. pistons. Now here is where it gets weird. (Eh, you guys know me.) What I plan on doing is running TWO single circuit master cylinders and placing them just in front of and to the right of the steering wheel, to give it more of that steampunk look. On each MC, I'll plug 2 of the outlets and run a line from each; one to the front and one to the rear. I was wondering what size MCs should I run: The 19 or the 22mm? And do you think I should run any residual pressure valves (2lb) on both of them? (The front disks are standard EMPI for Superbeetle spindles.)
Yes, I know I'm nuts. I'm here, aren't I?
Any thoughts would be appreciated!
Jeff
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Old March 16th, 2017, 04:38 PM   #2
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Default Re: brake MC size and stuff

Use an adjustable brake bias.
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Old March 16th, 2017, 04:41 PM   #3
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Default Re: brake MC size and stuff

http://www.speedwaymotors.com/Wilwoo...5-1,56213.html
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Old March 16th, 2017, 04:41 PM   #4
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Default Re: brake MC size and stuff

you shouldn't need residual pressure valves if your MC is located higher than the calipers.
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Old March 16th, 2017, 04:49 PM   #5
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Default Re: brake MC size and stuff

Quote:
Originally Posted by Unkl Ian View Post
Not really needing the pedals. I have something crazier lined up for those!
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Old March 16th, 2017, 04:51 PM   #6
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Default Re: brake MC size and stuff

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Originally Posted by Unkl Ian View Post
Use an adjustable brake bias.
What would I need that for? Just to lessen the strength to the rear vs. the front?
Jeff
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Old March 16th, 2017, 05:53 PM   #7
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Default Re: brake MC size and stuff

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Originally Posted by JiI View Post
What would I need that for? Just to lessen the strength to the rear vs. the front?
Jeff
you're running vw fronts with Gm rears. nothing wrong with it but because they aren't designed to work together you aren't really going to know how they're going to perform. you're going to need a way to adjust them to make sure they work correctly and stop you safely. locking the rear brakes up before the fronts is bad, as is having all front and no rear.

http://www.speedwaymotors.com/Speedw...lve,24060.html
something like this plumbed in line will allow you to dial brake out of the front or rear as needed to make sure you're balanced when you step on the pedal.
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Old March 16th, 2017, 06:19 PM   #8
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Default Re: brake MC size and stuff

In '81 I installed a '71 disc brake Type II front end under the front of the Single Cab. The power disc setup has a factory proportioning valve. When I set up the drum brake 9" Ford in the rear, I found a set of Ford wheel cylinders with the same bore as the original Type II rears. The system has worked without a problem.
Of course, I'm using a pedal and the master cylinder is located where the VW Gods intended...sort of.
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Old March 16th, 2017, 07:18 PM   #9
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Default Re: brake MC size and stuff

Thanks guys. I'll need to figure out how to connect all the lines together too. The front ones are easy, it's all 10mm x 1.00 threads. But the back is going to be a bit crazier. I'll probably end up linking 5 different adapters to get it to work.
So should I run the 19 or 22mm master cylinders or one of each?
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Old March 17th, 2017, 09:40 AM   #10
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Default Re: brake MC size and stuff

"So should I run the 19 or 22mm master cylinders or one of each?"

Based on my massive experience with your type of system, sure, why not?
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Old March 17th, 2017, 09:42 AM   #11
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Default Re: brake MC size and stuff

So a 19 on the front 22 on the rear or vice versa? Or both 22 or both 19? Or just forget it, cut a hole in the floor and Fred Flintstone the whole thing?
Jeff
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Old March 17th, 2017, 02:38 PM   #12
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Default Re: brake MC size and stuff

I'd run the 22 up front & a 19 in the back then put an adjustable proportioning valve on both systems

Then again what do I know


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Old March 17th, 2017, 04:39 PM   #13
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Default Re: brake MC size and stuff

Just got an email from speedway motors. They said to run the 22mm and I can run it with or without valves.
I think I'll run dual 22s. As for the proportioning valve, I can adjust the amount of throw of the pushrod into the MC.
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