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57 Suburban dual pot master cylinder conversion
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jaded13640
Posted 2020-06-18 3:05 PM (#599827)
Subject: 57 Suburban dual pot master cylinder conversion


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I bought a dual pot master cylinder for a 67 or so road runner. I want to convert the single pot to a dual pot but I don't know how to come up with a brake light switch. On the 57 the switch is on master cylinder itself.

I'm curious how you guys have gone about the master cylinder upgrade, what lines you used, if a proportioning valve is needed and how you made the brake lights work.

Thanks in advance,

Wayne
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56D500boy
Posted 2020-06-18 3:57 PM (#599830 - in reply to #599827)
Subject: RE: 57 Suburban dual pot master cylinder conversion



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Location: Lower Mainland BC
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There are at least two alternatives for the brake like switch:

1. Create a bracket and mount a newer plunger style switch on your brake pedal (and run new wires from the engine bay to the switch).

2. Put a T in the plumbing with a fitting to accept a screw in pressure switch like 71Chargerfan did (you can see his proportioning valve down there too (I think he went discs on the front)):



REFERENCE:

http://www.forwardlook.net/forums/forums/thread-view.asp?tid=71993&...

Edited by 56D500boy 2020-06-18 3:58 PM
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local2Ed
Posted 2020-06-18 8:20 PM (#599834 - in reply to #599827)
Subject: Re: 57 Suburban dual pot master cylinder conversion


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On my 1957 Dodge Sierra I took a piece of exhaust pipe the same diameter as the steering column, cut a section out so it looked like a "C", welded a short tang at 90* to the "C" with a hole drilled for the plunger style brake light switch. I used a hose clamp to hold it to the steering column and ran the wires to the existing ones under the hood.
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jaded13640
Posted 2020-06-18 9:36 PM (#599836 - in reply to #599834)
Subject: Re: 57 Suburban dual pot master cylinder conversion


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Wow dude, that's brilliant! I'm going to do that! I think I'm going to go with the inline connector that accepts the switch for the short term but I'm definitely doing something like that to make an under dash brake light switch.

Thanks everyone and keep em coming!

Wayne
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jaded13640
Posted 2020-06-26 8:03 PM (#600152 - in reply to #599827)
Subject: Re: 57 Suburban dual pot master cylinder conversion


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So I ended up doing it similar to how 71 charger fan did but I put my switch in the rear (closest to firewall) because that's the side that activates first. But I didn't use a proportioning valve. They work awesome! I think it's a combination of using 1/4" line to the "T" which feeds the two front brakes with 3/16" line and having dual wheel cylinders on each front brake that makes it work good without the rears grabbing. I thought I'd have to install one of the adjustable proportioning valves to keep the rears from grabbing first but, since they didn't I don't plan to use one. I've got the asbestos shoes for the front from Craig on it and adjusted up pretty close. They'll wear into the shape of my drums I suspect. The master cylinder I bought three years ago was for about a 67 -67 B body but it had sat dry for all that time and when I went to bleed it it apparently flipped a seal and wouldn't retract all the way. I popped everything out and everything was fine, I just put it back in. BUT, it was under warranted and I can get a brand new one on Monday. I'm tempted to pass on the new one now that I have this one working so well. The one I bought was a re-manned. I like the idea of having a brand new one...I guess I'll decide Monday when the part comes in.
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jaded13640
Posted 2020-06-27 4:28 PM (#600191 - in reply to #599827)
Subject: Re: 57 Suburban dual pot master cylinder conversion


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Just a quick update, I drove the car about 40 miles away to a show today. The brakes work SO much better than they had. I can't say enough about the asbestos shoes from Craig. They only now starting to really "wear in" to the actual diameter of the drums. The only problem I have now is that my mechanical steering gear is so loose the corner that is adjusted up the most pulls bad! I started another thread in the steering and suspension section to inquire about what I might be able to do about it.

But I'm completely sold on Craig and the asbestos shoes, I'll be buying the rears on payday!

Thanks to everyone who helped me along the way. Converting the master cylinder ended up being pretty darn straight forward actually. I got everything I needed in one trip to the parts store.

Wayne
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