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Stahlwerks.com
Join Date: Dec 2001
Location: Columbia, SC
Posts: 4,301
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vw master cylinder
Which VW master cylinder have you guys used for converting to dual circuit systems? Do I just need a 68 and up bug MC? I'm repairing the brakes on my 63b.
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John Helgesen Stahlwerks.com restoration and cage design "Honest men know that revenge does not taste sweet" |
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03-01-2008, 02:00 PM
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Registered
Join Date: Jun 2005
Location: Carmichael, CA
Posts: 617
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I need to check to be sure, but I believe we're using a 911 dual circuit master cylinder on my dad's '60 S90.
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1960 356 Super 90 - EFI'd 1989 190e 2.6 1991 964 |
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03-08-2008, 08:13 AM
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Stahlwerks.com
Join Date: Dec 2001
Location: Columbia, SC
Posts: 4,301
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I should have a 69 and up bug master cylinder to test next week. 19mm, dual circuit. We'll see how it works.
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John Helgesen Stahlwerks.com restoration and cage design "Honest men know that revenge does not taste sweet" |
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03-14-2008, 12:57 PM
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Fuchs w h o r e
Join Date: May 2003
Location: Vancouver, Canada
Posts: 644
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VW dual cct master cylinder trivia:
First appeared in 67. Original 67 - 72 MCs had residual pressure valves in them. Later ones had restriction drillings to slow the return of juice back into the MC. Karmann Ghias with discs on the front had a MC with different stroke lengths. None of these details really matter today since there is only one version of MC available now. Brazil, India and Germany are sources I know of. German ones are not expensive. |
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03-16-2008, 12:23 AM
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Registered
Join Date: Sep 2004
Location: seattle, wa
Posts: 570
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skirmants recommends the vw #133 611 015 for drum applications - the 911 master cylinder works for discs - the vw unit will need a 911 resivoir and tubing with a remote location - my understanding is that it is unsafe to use a master cylinder for disc brakes on a drum brake car - hope this helps - brad in seattle
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BBK ESQ '73.5 911 T/SC '76 914 "S" (from original owner) '62 356 T-6 Hardtop 62 OutlawR - porsche collection complete! '66 mercedes W111 euro s/r coupe - "silence is the sound of discretion!" |
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03-16-2008, 10:19 PM
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Stahlwerks.com
Join Date: Dec 2001
Location: Columbia, SC
Posts: 4,301
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German master cylinder showed up last night. Now to figure out which line goes where, where to put the switch, and which one to plug.
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John Helgesen Stahlwerks.com restoration and cage design "Honest men know that revenge does not taste sweet" |
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03-19-2008, 06:40 AM
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Registered
Join Date: Sep 2004
Location: seattle, wa
Posts: 570
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hey - you have the same master cylinder, as recommended by skirmants - i have denny akers here in seattle doing the install, and he is having a tough time, without other parts - it turns out that you can get all of the other parts at:
www.klasse356.com check out the drum brake dual conversion kit - i think that akers is getting the remainder of the kit w/o master cylinder - this sounds like the way to go - i'll keep you posted! brad in seattle 62 T-6 Notchback OutlawR |
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03-21-2008, 12:34 PM
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Registered
Join Date: Jun 2005
Location: Carmichael, CA
Posts: 617
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Quote:
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1960 356 Super 90 - EFI'd 1989 190e 2.6 1991 964 |
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03-29-2008, 02:13 PM
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Registered
Join Date: Sep 2004
Location: seattle, wa
Posts: 570
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i'm not a mechanic, so don't hold me to this, but i read that either the drum or disc system needs to be "backed off" a bit upon pedal release, and that this sets up the brakes for the next engagement
- i mentioned this to the guys at the local vw parts shop (bow-wow, lynnwood, wa) and they said that in their opinion, it's better practice to run dedicated systems, but that mixing master cylinders will not cause the brakes to fail, but rather for the brake feel to be compromised - i have also read that well maintained single circuit systems rarely fail for my purposes of building a tour/track day 356, and eventually vintage racer, i wanted to make sure that everything was done to the highest standards of safety and performance - you might want to check with vic skirmants at 356 enterprises and/or the 356 registry for more detail, much more detail, and maybe too much detail!!! i will soon post photos of the amazing set up Akers here in Seattle put together for me, including vented front drums!!! hope this helps - brad in seattle |
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03-29-2008, 05:13 PM
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Registered
Join Date: May 2001
Location: Hurst, TX. USA
Posts: 804
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You can get a dual circuit master cylinder that will work with drum brakes. If you find the right one, you can even use the reservoir for a 944. It will mount on top and clear all the steering linkage. You have to reverse the steering damper and move it to the top tube instead of the bottom, but everything else fits. I have done this on a few customer cars, Including a 59 A cab that I currently have on the lift at my part time job. In deference to our hosts here, I won't name the place, because they are a competitor.
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Clay Perrine 74 914 1.8L (Frodrick) 73 914 /6 4.0L 964 motor (Igor) 70 914 /6 Factory Six. (Elwood) 95 BMW 540i (Inga) |
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05-12-2008, 08:00 PM
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Car Crazy
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vw mc
The VW beetle 68 on MC works great for disc or drum brakes. The mounting holes must be drilled to clear the 356 8mm studs which are not long enough to protrude through the mc. I grind enough metal from the mc to allow nuts to engage. The extra holes I plug with welded brake line ends. I use a Y connector between the single reservoir and dual inlets or use dual reservoir. The 911 part is expensive and requires the push rod be shortened, not the VW MC The currently supplied MC has no residual pressure check valve so it works fine with discs. Both the 911 and Beetle MCs are 19 mm
Last edited by RICK RAES; 05-21-2008 at 05:34 PM.. |
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05-21-2008, 05:30 PM
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