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rockerarm Samba Member
Joined: December 16, 2009 Posts: 3552 Location: Los Angeles
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Posted: Fri Jul 25, 2014 12:01 pm Post subject: Single Circuit Master Cylinder |
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Hey all.
I am working on a new friends '65 Bug that he just purchased. I noticed that there is a "bus type" master cyl that has its reservoir on top. I believe the internal bore dia is about 22mm. I inspected the brakes and verified the wheel cyl dia's to be 22mm front and 19mm rear. My parts research shows the type 1 to have these size wheel cylinders for most of the early cars.
But, the master cylinder sizes are 19mm for '54 to '64 and 17mm for '65 and '66.
My main question is why the two different m/c sizes when all the affected cars use the same wheel cylinder size. As we speak, since I had replaced the front beam and adjusted/bled the front brakes the pedal is very high, with little pedal travel. I have not driven this car to see how it stops.
Per the internet research, the 17mm master would yield the highest psi to the wheel cyl's and the 19mm master would give a higher pedal with a reduced pedal travel.
Thanks to all in advance. Bill
So, what are you guys using with a lowered sedan with close to stock wheels and tires? |
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mukluk Samba Member
Joined: October 18, 2012 Posts: 7023 Location: Clyde, TX
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Posted: Fri Jul 25, 2014 12:50 pm Post subject: Re: Single Circuit Master Cylinder |
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rockerarm wrote: |
My main question is why the two different m/c sizes when all the affected cars use the same wheel cylinder size. |
The smaller diameter master requires less pedal effort to stop the car than the larger master, the tradeoff being it requires longer pedal travel to do so. _________________ 1960 Ragtop w/Semaphores "Inga" |
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Stuart Maingot Samba Member
Joined: December 13, 2009 Posts: 240 Location: Trinidad West Indies
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Posted: Fri Jul 25, 2014 12:58 pm Post subject: |
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What u have read about the perf difference between the two sizes is correct. Which one is a matter of personal preference. In my opinion i prefer the smaller bore for my 69 beetle and i also use a small bore daihatsu mc on my split panel. It fits so perfectly. I plan to go to a larger bore mc on the panel but also with a vaccum booster which i think is necessary. |
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VOLKSWAGNUT Fastest VW Belt Changer
Joined: October 14, 2007 Posts: 11055 Location: Flippin' a Belt........ .... Off-n-On ... NC USA
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Posted: Sat Jul 26, 2014 6:19 am Post subject: |
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FYI... the single circuit 22mm Master with the reservoir on top.. is commonly called and sold as a "Buggy" master cylinder..
Personally... I hate the rock hard and high effort pedal those ^ develop on a Beetle..
Now's the time....
For some added safety alone...upgrade the single circuit master to a dual master.
Use a 67 and newer Beetle master and the universal top mounted reservoir sold by just about all VW parts suppliers. (for non German masters)
. _________________ aka Ken {o\!/o}
Its your vehicle- stop askin' for approval-do what YOU like for cryin' out loud
Better to roll em' how you want and wear em' out-than lettin' em' rot out
Its about the going not the showing
Rebuilt to drive not decorate
WANTED: Local Eatin' Joints, Triple D for TheSamba contributions here http://www.thesamba.com/vw/forum/viewtopic.php?t=570510
Search "VOLKSWAGNUT" on YouTube since you cant watch a "certain" BELT change video round here
Usually and often edited |
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