Help me find a master cylinder - really old stuff warning!| Grassroots Motorsports forum |

fanfoy Dork
10/25/16 2:46 p.m.

I'm still moving very slowly forward on my speedster build and I want to use the pedals that came with the donor see below:

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But I want to use a double circuit master (as opposed to the single circuit pictured). Does anyone know where I could find a double master cylinder with a bottom mount like the one pictured? I could build a bracket to adapt to usual front mount MC, but I would prefer an un-modified solution.

patgizz GRM+ Memberand UltimaDork
10/25/16 2:49 p.m.

what donor?

fanfoy Dork
10/25/16 2:57 p.m.

Sorry...1935 Plymouth with four wheel drum brakes. The current MC is 3/4" bore.

RossD UltimaDork
10/25/16 3:19 p.m.

Our old 1953 Jeep CJ-3A had the master cylinder below the pedals like that too, but that looks like a single circuit too. I did find a dual circuit kit:

https://www.kaiserwillys.com/dual-reservoir-master-cylinder-conversion-kit-fits-41-71-jeep

Something to consider, I suppose.

hhaase Reader
10/25/16 4:58 p.m.

Mis-read your post, didn't catch you wanted to keep your existing pedals.

Will have to get looking again.

Edit: I'd give these guys a shout, they sound like they know the chassis enough to give you an answer.

http://www.butchscoolstuff.com/brake-boosters-master-cyl-disc-brake-conv-kits/

-Hans

Tyler H GRM+ Memberand UltraDork
10/25/16 5:06 p.m.

I'm a believer that non-correct parts are okay on old cars, as it pertains to brakes. Put a modern, dual-circuit MC on that puppy. Can you just adapt the pedal to a Wilwood MC?

egnorant SuperDork
10/25/16 6:27 p.m.

By "unmodified" I assume you mean no drilling or welding on the pedals, frame or master cylinder??

Would a bracket/adapter from bottom to end mount qualify?

Bruce

markwemple SuperDork
10/25/16 6:29 p.m.

I think there is a restoration place in VA that specializes in brakes. I'll try to remember the name.

BrokenYugo UltimaDork
10/25/16 7:00 p.m.

You'll probably be building a bracket, I think the MC under the floor predates the 1968+ dual circuit stuff by quite a while.

maj75 Reader
10/25/16 8:21 p.m.

Ton of these available, some with power brake boosters. Here is one:

http://www.speedwaymotors.com/1933-1934-Ford-Frame-Master-Cylinder-Frame-Rail-Mount,7821.html

A bunch on EBay.

novaderrik UltimaDork
10/26/16 12:09 a.m.

Tyler H wrote: I'm a believer that non-correct parts are okay on old cars, as it pertains to brakes. Put a modern, dual-circuit MC on that puppy. Can you just adapt the pedal to a Wilwood MC?

This is what i would do.. Wilwood masters are cheap, and you could get tricky and run 2 of them with a balance bar with a little effort..