Need help to identify this brake drum

Hi,
I'd appreciate if someone could recognize this one. I'm going through the parts I got with my 29' sedan project and a**** other parts I've got a set of four drums.
Thanks for your help!

Pasi

 

It's a 1932-34 Ford drum, I've never seen the rear drums with the open face like that front one.

 

It was called a "Rockey Mountain" setup I believe. They were made to help not overheat coming down the big p***es. 4 of those and backing plates would be worth having. Someone could juice 'em and gave a pretty slick old timmer setup.

Here is a recent link but we have discussed these a ton a quick search with mountain brakes netted me something like 17 pages of info not all on these brakes but of you have the time it is a place to start.

http://www.jalopyjournal.com/forum/showthread.php?t=634692&highlight=mountain+drums

 

Thanks guys for showing me the path to follow. I also have the backing plates. I will go through the threads suggested.

 

good engineering for the day.

 

"Rocky Mt." brake were a accessory for Model T's. Stock T's brakes all were in the trans. Rocky Mt. brakes were added to the rear hubs. Don't know how much cooling would be done with the OP's style drums as the wheel bub pretty much covered that area.

 

Front drum for 1935 Ford with the concentric ridges. Not 32-4

 

What did these brakes come off of?

Here is another thread.

 

I just noticed that you are in Finland. If you decide to juice those and need pieces let me know. I'll help you get them to your part of the world.

 

As far as I know this is correct. 1935 only with concentric ridges. I run them my 32 with mechanical brakes and they work fine. And they did make "rockie mountains" for the rear wheel although I am still looking for a nice set of "wide five" rockies for the rear. Found some for the front but I can't find any for the rear!

 

That is a truck drum it's around 1935 and the backing plates that fit the drum are hydrolic !

 

Yep Rocky Mountain drum..I had one on my 28's front axle so they will fit that far back

think I may still have it

 

NO, 32-36 was 12", Late 31 was the only time for cast iron on A's and it was 11". Those won't work on your A unless you swap backing plates and figure out somthing different for the brake acuators, or Juice... Nice pieces though.

 

I have one that came on a 36 rear end I bought. I was told it was an early 35 replacement drum. The one side was a solid drum and the other was the one like you pictured