Hi folks; for those interested, and can remember back a few daze, I was in
a dizzy over early Ford F-100 brakes and what fit what...
Well Ive 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 these 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 who responded to my inquiries about this dilemma.
***************************************
an 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 aint my shoes covered?
Clearly somebody at Ford long ago decided that track width must be changed
from what it was to something else. Im betting the one we are calling the
1955 is perhaps in reality a bit earlier say of 1948 to 1952 F-1
vintage. Im guessing here but I betcha that after 1952 some engineer
wanted a wider track of an inch and a quarter ( .625X 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, Im 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 theyd 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
Doug Anderson ,in NeuYaWK
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