Hi folks
Well I've done some checking on my old parts and have decided to post the
following in a effort of helping someone else at a later date with the
mystery of early F-1 and F-100 brake drums; I.E. what fits what
Hopefully some one can learn something or at least have something to think
about :-) Thanks to all of you who responded to my inquiries about this
dilemma! You're da' best!
***************************************
EARLY F-100 BRAKE COMPARISON
-between a "so called" 1955 set and a '56...
DRUMS: Both drums have 2 <" of "shoe surface". Look Identical but have
different "offset" see below.
SHOES: Both sets of shoes are actually 2" in width.
HUB BACKSPACE:
(measured straight back from the brake drum face
on the hub to the backing plate with a steel rule)
-on the so called 1955; 2.625
- on the alleged 1956; 3.250
the difference; .625
DRUM OFFSET:
( as measured with the drum to wheel face lying on a flat surface. (open
side up)
Measurement is from that flat surface to the outside edge of the drum)
-on the so called 1955; .220
-on the alleged 1956; .620
the difference; .400
Because the hubs were spaced out further, so too did the drums need MORE
backspace" in order to cover the shoes entirely. Thereby answering the
nagging question, "why ain't my shoes covered"?
Clearly somebody at Ford long ago decided that track width must be changed
from what it was to something else. I'm betting the one we are calling the
"1955" is perhaps in reality a bit earlier say of 1948 to 1952 F-1
vintage. I'm guessing here but I bet'cha that after 1952 some engineer
wanted a wider track of an inch and a quarter ( .625"X 2 = 1.25" change in
track ) so they changed both the hub flange centerline and the drum
"backspace" to make that happen. What I stumbled upon was a mis-match of
different year parts. The moral to the story being "you must keep hubs AND
drums of the same years together when messing with early Ford truck brakes"!
Further, I'm betting that suppliers in the past twenty or thirty years
either; 1. Forgot they were different, -or 2. Did not feel there was any
profit in making two different drums for these early applications figuring
(and perhaps rightly) that they'd never get their money back from tooling up
to make the "shorter" of the two so they just blew it off -leaving those of
us inclined to mess with rusty old Ford stuff to be forever lost in the haze
of time and wirebrush dust. Wandering about forever like the guy with the
lantern looking for an honest man
so now you know "the rest of the story"
-now I just gotta find some drums like mine...
Dirt Track Doug,in exile, in S0-NeuYaWK
(who had a ball hangin out with ol' pal Dave Richards at the really fast,
1/4 mile Speedway Motorsickle races Saturday nite in Harpursville NY -even
if Dave did fall in the third turn LEADING all the kids around the track.
He still got a third. He was bookin' kiddies!
BTW they use 185lb. motorsickles with 500cc singles on alky...
Daves is a twin cam four valve JAWA. WhoooooM-Bah! ) Boy to be twenny
again...
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