Let us know how your stopping ability has changed.
Did you install a dual resevoir master cylinder?

 

I will be adding a dual reservoir, yes. I don't se how braking isn't going to be dramatically changed. I've added 50% more braking.

 

I added the two '69 drums and took it for a ride. . . definitely more braking Now I'm adding the dual MC. Expecting even more then

 

Here is the dual reservoir master cylinder mounted. It's an AMC MC ( '71 Matador drum/drum )

, with a port for the brake switch. That way, not tee needed in the brake lines. I didn't have to alter the wires at all, it reached fine. I flipped the harness strap is all. To fit the MC, I had to open up the holes 1/8" on each side, towards the middle of the MC. Bolt spacing is 3 1/4" on the stock MC and the AMC was 3 1/2". It took about 5 minutes with a die grinder, easy peasy. The input rod from the stock single reservoir MC would not work. It had no "ball" on the end, so it just slipped into the MC . . too far. I could have welded a ball on the end and used the stock rod, I had some rods and just shortened one to fit.

 

Hello PetesPonies,
From your photo in Post 45, I notice you've installed the brakes shoes with the larger "Primary" shoe at the rear, as it should be correctly.
I've read where some people have installed two Primary shoes one each side, (which means you have to purchase two sets of brake shoes to do this) for the reason of having more brake shoe surface area riding the drum when braking. Some say they experience more braking power when stopping, and, more holding power when at a stop on a hill and such(???)...
Have you considered this small detail as well, now that you're operational again?

My second question for you is whether or not you are aware of any other dual resevior master cylinders that have the cast-in port for the brake pressure switch? Or, was this AMC M.C. unit the only one you found for your swap application?

Thank you - great job by the way

 

As a retired Auto Instructor, you are a bit confused. The primary shoe is the one that is most forward and is the smaller lining. This is true on all servo drum systems. The smaller front show activates and pushes the larger secondary show against the drum. more braking results this way and it is how servo brakes work. As for the MC, AMC is the one I found that was close enough to work. It isn't difficult to make it work as I outlined.

 

My mistake, I apologize.
Thank you for the correction.

 

No problem. You going to try the dual reservoir MC ?

 

A friend of mine has a '64 F100 that is still mostly original, except for some minor cosmetic changes over the years. He wants to upgrade his master cylinder and will try the AMC dual resevoir unit in his application (while we are under COVID-19 watch) as he has factory drum-drum.
He will drive his truck this summer while mine will likely remain parked - due to home reno project awaiting better weather.
Thank you for your update information -Pete

 

The braking is great now. Tons of pedal, can lock them up with too much pressure applied. But not a problem during normal braking, so happy with the modification. I have a '69 and a '71, so braking feels just like those now.