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Single Circuit Master Cylinder
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rockerarm
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PostPosted: Fri Jul 25, 2014 12:01 pm    Post subject: Single Circuit Master Cylinder Reply with quote

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
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PostPosted: Fri Jul 25, 2014 12:50 pm    Post subject: Re: Single Circuit Master Cylinder Reply with quote

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.
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Stuart Maingot
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Location: Trinidad West Indies
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PostPosted: Fri Jul 25, 2014 12:58 pm    Post subject: Reply with quote

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
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Joined: October 14, 2007
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PostPosted: Sat Jul 26, 2014 6:19 am    Post subject: Reply with quote

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)

.
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