I have no clue what they came off of. the back plate mounting holes line up with a '28 spindles I have. doesn't look like juice brakes. Can they be converted to juice? Thanks
My guess is late30's. I have a set of them. I don't think they are strong enough for hydraulic brakes. They should be 33,34,35 ? Lee
I think they're called "Rocky Mountain Brakes". http://www.jalopyjournal.com/forum/...9&highlight=rocky+mountain+brakes#post6304209
They came on one year model A, 31 and were only 11" diameter. 32-35 were 12" diameter and 36 was the last year and the only year with the wide 5 pattern. I have always heard them called rocky mountain brakes...lots of montains there...better cooling. They can be used with juice, with some backing plate mods. Left to right, 32-35 and 36 only front and rears.
They are mechanical brakes. I suspect they are 12" brakes and would be stock production 32-35 brakes. Not "Rocky mountain". I have actually seen them converted to hydraulic by removing the parts at the bottom between the shoes and adding a cylinder. The 39-48 type cylinder would be required due to the pivot points of the shoes.
the 36 wide five had a longer snout on them, so in order to use them with hydrolic brakes you have to adapt the spindle to the backing plate i believe.
The 11" rocky mountain drum was 31 only, next year till the last year of production, 36, they were 12". The wide 5 rocky mountain drum was only available in 36, they also made the solid style too that year. In 36 the drum snout was longer and as such the 36 spindle is also 36 only. The 36 drum and backing plate were recessed over the spindle so the brake acctuator rod could pass through the king pin. In 37 and 38 the mech. brakes were cable operated and the backing plate was flatter, as a result, making the 37-38 drums work with the 39 and later juice backing plates.
Here are a couple of pics, the 12" and the 11" 31 only model A drum. The model A drum will fit the earlier A's too but weren't offered then.
The funny hydraulic conversion was likely Ansen...they sold all the varieties of 1929-38 Ford backing plates converted to hydraulic as exchange kits, complete with MC brackets and lines. They must have been common, as thew were advertised everywhere through the '50's and early '60's, but I have seen ony fragments of any of them.
Those are late 32-34 backing plates and 32-34 drums. The 31 open drums and the 32-34 drums are easily distinguished by the fact that the 32-up drums have a much larger 'shoulder' on the outside of the spokes. Model A (11") and early 32 (12") backing plates have a rectangular recess around the spindle mount, while the late 32-34 have a conical recess like those pictured.
Bearings for what? I believe 28-48 front wheel bearings are all the same; Timken Part #'s 09074 Outer Cone & Roller 09196 Outer Cup 15118 Inner Cone & Roller 15250X Inner Cup
The Jalopy Journal
