Rocky mountain brake drums

V4F

V4F

Well-known member
i have 2 sets of the rocky mountain drums . 1 set is on my '31 , the other is in the garage . question : the ones on my '31 have a push in dust cap (wheel brgs) , but the ones in the garage have threaded dust caps . are they for '28-'29 fords ?? ......... thank you .. steve
 
As I understand it they are just late 31 drums that aquired the name Rocky Mountain drums.I have three sets I collected over the years,mostly one at a time.I only have one set on a vehicle though.
 
steve norcal said:
i have 2 sets of the rocky mountain drums . 1 set is on my '31 , the other is in the garage . question : the ones on my '31 have a push in dust cap (wheel brgs) , but the ones in the garage have threaded dust caps . are they for '28-'29 fords ?? ......... thank you .. steve
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Steve,

Measure the diameter of the drums in the garage. If they are 12 inches the drums are 1932 to 1934 or maybe 1935 which look similar. This may explain the dust caps. But again, it may not.

Charlie Stephens
 
When I bought my '30 Sport Coupe it came with four "Rocky Mountain" cast brake drums. They of course are not solid, but have four or five openings in the face of the drums. The purpose of the openings I have been told was to allow air to circulate in and around the brakes to help cool them.

I now learn in this thread that there never was "Rocky Mountain" drums for the Model A. If that is the case what kind of drums do I have with the openings? By the way the hubs on my drums do screw in.
 
I think it is just the way they were manufactured.Less cast metal stores less heat.No more air can get in there anyway as the wheel seals it up tight.The rears were still solid as the old pressed drums.
 
Hi Steve, both my '31 Model A's have the open cast iron brake durms (refered to as Rocky Mt brake drums) on the front.
The pickup has a non indented fire wall, was built in May 1931.
The Slant Town Sedan was built in Richmond CA in August 1931.
I love them!
I have not seen any cast iron rear brake drums.
Regards,
herb
 
QUESTION: I am familiar with the "spoked" late 31 cast iron drums on the front and always wondered if the rear drums of the same era were cast iron and if they had the "spokes".

I don't see how much air could circulate with the wheel mounted on the drum.

Richard
 
I had always thought that rocky mt. drums were the bands that were heated and pressed on the outside of stock steel drums to keep them from expanding while decending steep grades.
warren va
 
Frank Nemo said:
When I bought my '30 Sport Coupe it came with four "Rocky Mountain" cast brake drums. They of course are not solid, but have four or five openings in the face of the drums. The purpose of the openings I have been told was to allow air to circulate in and around the brakes to help cool them.

I now learn in this thread that there never was "Rocky Mountain" drums for the Model A. If that is the case what kind of drums do I have with the openings? By the way the hubs on my drums do screw in.
Click to expand...

Frank,

You have the late 1931 cast iron drums manufactured by Ford.

Charlie Stephens
 
Richard, the rear drums made by Ford in 1931 and later are cast iron but do not have holes and spokes. They are much like modern cast iron drums. I have a pair.
 
thank you gentlemen for your info . ive been running my spoked drums (rocky mtn) for 3 yrs now & like em . have cast on the rear . the only part i didnt know was that some had treaded dust caps . i believe they measure 10 1/2" , same as mine .
thank you all again ................... steve
 
The Berg said:
what is a good pair of the 12" spoked drums worth?Thanks
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Unfortunately (if you are selling) probably not much when compared to original Model A cast drums. The supply of drums/hubs in the '32 to '35 period exceeds the demand. Of course you can always run into the guy that is desperate to get his car back on the road and get more. My guess would be about $30 for a good drum and hub (.030 oversize) maybe $150 for NOS. This might be a better question for the V8 forum.

Charlie Stephens
 
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