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Author Topic: 70 disc brake backing plate numbers  (Read 857 times)

Offline RocketScientist

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70 disc brake backing plate numbers
« on: January 24, 2021, 09:06:23 PM »
I have seen an number of restored cars having white paint-stamped part numbers on the front disc brake backing plates. They typically have  C9OA-2K00-B for the left side and C9OA-2K004-B for the right side. Did this happen on assembly-line cars or is it something associated with service parts?
Brad
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Offline J_Speegle

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Re: 70 disc brake backing plate numbers
« Reply #1 on: January 24, 2021, 11:00:35 PM »
Guess your referring to the large black dust shields?

Date coding in stamp form on the back side of drum brake backing plates I've seen and have made but I don't have a picture, recall seeing and no one has mentioned to me about a stamping as you describe related to the disc brake assembly.

Would need to see a picture to comment further or offer an opinion of what they are or where they might have migrated from


Is this the part that your referring to?

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Jeff Speegle

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Offline RocketScientist

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Re: 70 disc brake backing plate numbers
« Reply #2 on: January 25, 2021, 06:28:04 AM »
Yes that is the correct part and the part stamping on the plate is in the area just below the lower control arm.  It is in a difficult spot and I have been unable to ever take pics of it.

Personally, I have doubts to their authenticity but I am curious to know if it is something that has been made up or if part numbers were applied in this area.
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Offline RoyceP

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Re: 70 disc brake backing plate numbers
« Reply #3 on: January 25, 2021, 10:53:57 AM »
Never have seen that on a car - maybe like you say it is something that appeared on service parts? Fortunately DNO is reproducing them with the Fomoco stamp:
https://www.deadnutson.com/1969-73-disc-brake-driver-side-dust-shield/

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Offline Bob Gaines

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Re: 70 disc brake backing plate numbers
« Reply #4 on: January 25, 2021, 01:29:16 PM »
Quote from: RoyceP on January 25, 2021, 10:53:57 AM
Never have seen that on a car - maybe like you say it is something that appeared on service parts? Fortunately DNO is reproducing them with the Fomoco stamp:
https://www.deadnutson.com/1969-73-disc-brake-driver-side-dust-shield/


A Scott Fuller reproduction product I believe that DNO stocks.
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Offline specialed

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Re: 70 disc brake backing plate numbers
« Reply #5 on: January 25, 2021, 06:29:33 PM »
There are 2 types or vendors on these square and round fomoco  and a triangle. I have some nos ones and they have a paper c9oz part number but i have never seen an ink stamp c90a # on them  where did u see that ink stamp ?
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Offline RocketScientist

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Re: 70 disc brake backing plate numbers
« Reply #6 on: January 25, 2021, 08:35:11 PM »
A particular 'concours' mustang restorer (who'll remain nameless) was applying them to his cars but I haven't seen them anywhere else. So it has gotten me wondering.....
If the NOS ones were C9OZ, then this is a further hint that things may not be correct.
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