I just completed this upgrade on my 66 F100, I had
already done the disc brakes for the front. My rear brakes now match again the front disc
setup as designed by Ford.
First; Ford increased the size of the rear brakes by 1/2" in 1968. Pre
73 9" rears are the same width from 57 to 72, and were increased in width in 73
to track the front. Note years that parts can be used.
Parts needed:
1- axles from a 68-72 Ford truck 9" The wheel bearing does not set as deep on
the axle, even though it is the same length. It does not extent as deep into the center
chunk.
2- backing plates, shoes, and drums for 68-85 Ford truck 9"
Must do:
1- existing hand brake cable must be removed at backing plate and retained, lengths can be
different.
2- backing plate has to be swapped. Outer rim lip is shallower where it goes into the
drum.
3- Might be a good time to replace wheel cylinders, and brake lines. Lines tent to break
before unscrewing.
General work:
Remove wheel, drum, and all brake parts, release hand or park brake cable, brake line,
pull axle, and backing plate.
Install new backing plate, wheel cylinder, brake lines, reconnect parking brake cable, new
shoes and parts, insert axle, (a good time for new axle seals) new drums and adjust
brakes, fill master cylinder and bleed brake lines.
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