Dual Brake Master Cylinder

Jon March

Member
I dont know about others with fullsize spares, but i went to the used tire dealer and got the smallest tire that would fit on the spare rim- gives plenty of room!
 

jfriese

Active Member
I use a matching full size radial as a spare. Both work fine on my two cars, but since they are a different brand, one is a bit too thick for the hold down nut to grab the shaft. I made up a custom nut that reaches down a bit and that has worked fine for years.

John Friese
67 White
67 Red
 

SNKR770

Member
Master cylinder is from 68-69 VW Bus with manual brakes - Available new from Bughaus for $140 or rebuilt A-1 Cardonne #11-1558 from local parts store for about $30. 7mm Brake hose, 10mm bleeder(to close off extra rear outlet) and nylon master cylinder connector pipes (small) all came from Bughaus. Lines from reservoirs to master cylinder formed from 40 inch pieces of 1/4" steel brake line. Plunger from brake pedal needs to be turned down slightly or master cylinder piston drilled out slightly for proper mating. Pretty simple and straight forward.
Ted

Thanks for this post. I want to do the conversion and building a shopping list but am not sure what "nylon master cylinder connector pipes" are? Are these what I am pointing two with red arrows or are you talking about the black cap. (Blue Arrow)? If so, is there a part number for these or a thread size to search and find? Can I assume from the other picture that you can get these in brass
 

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John Howland

New Member
I have had my dual master cylinder in use for over a month now and its working perfectly and I have DOT 5 brake fluid! Maybe its me but the pedal seems more solid than the single circuit system and I seem to dry the brakes out quicker after being in the water! Its close to the spare but doesn't hit! On a side note, I just met a guy who flagged me down on my lake and he just bought an Amphicar! Its a complete car with not much rust at all but is needing restoration. He paid $4500. It was listed on craigslist in Western Mass. So they are still out there!!
 

SNKR770

Member
Still no answer to my question, and hoping someone can add a little more clarity on what is needed for the non expert mechanic. Do the metal threaded connectors typically come with the masters cylinder? If they don't what are they called so that one can order them. Also what are the "nylon master cylinder connector pipes" that is described in Teds original post?
 

Ken Chambers

Platinum Subscriber
You'll need a dual master cylinder for a 68-69 bus: https://www.bughaus.com/master12.htm

Connecting pipes (elbows): https://www.bughaus.com/master_cylinder_connecting_pipe_-_113611153.htm

That fit into grommets: https://www.bughaus.com/brake19.htm

These are the parts I used in my dual master cylinder conversion.

You'll also need a dual reservoir (or another single). This is the one I used: https://www.bughaus.com/brake_fluid_reservoir_-_113611301L.htm

along with a custom bracket to mount it where the existing reservoir is located.
 

SNKR770

Member
You'll need a dual master cylinder for a 68-69 bus: https://www.bughaus.com/master12.htm

Connecting pipes (elbows): https://www.bughaus.com/master_cylinder_connecting_pipe_-_113611153.htm

That fit into grommets: https://www.bughaus.com/brake19.htm

These are the parts I used in my dual master cylinder conversion.

You'll also need a dual reservoir (or another single). This is the one I used: https://www.bughaus.com/brake_fluid_reservoir_-_113611301L.htm

along with a custom bracket to mount it where the existing reservoir is located.
Thanks Ken for the detailed list!
 

Dave_French

Gold Subscriber
The residual pressure valves on the 1969 Bus master cylinder were working a bit too well on our Amphicar; I was having problems with the brakes being locked up after sitting in the garage. I switched out the master cylinder at the start of this season with a 1967 dual circuit one that came without the residual pressure valves, and have had no problems since. I bought it nes, no core, from JC Whitney.
 

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