Brake Caliper Backing Plate Numbers - NCRS Discussion Boards

Brake Caliper Backing Plate Numbers

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  • Gary S.
    Super Moderator
    • February 1, 1984
    • 456
    #1

    Brake Caliper Backing Plate Numbers

    My NCRS judging manual says the front brake shields have the part number followed by the letter "L" or "R". I have some shields with the letter and without. The ones without look pretty old and original...dirty and pitted. Is it possible my bible is wrong? Anyone know for sure as I would like to have some plated and my best ones have no letter. Thanks, Gary
    Avatar--My first ever vette, owned 3X since 1977, restored 1993-2024. Top Flight Award 9/14/24
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    • Joe L.
      Beyond Control Poster
      • February 1, 1988
      • 43193
      #2
      Re: Brake Caliper Backing Plate Numbers

      Gary-----

      There were actually 3 different sets of part numbers for these shields. These are:

      65-67

      GM #3864117, left side; GM #3864118, right side

      68-only

      GM #3898011, left side; GM #3898012, right side

      69-82

      GM #3953423, left side; GM #3953424, right side.

      The original front brake shields on my original owner 1969 are the 3953423-4 shields and the DO HAVE the "-L" and "-R" after the part numbers. Also, I have several NOS 3953423-4 shields and they also all have the left and right indications.

      However, as far as the earlier shields go, I don't know if they had the left and right indications or not.
      In Appreciation of John Hinckley
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        • Gary S.
          Super Moderator
          • February 1, 1984
          • 456
          #3
          Re: Brake Caliper Backing Plate Numbers

          Joe, Thanks. Actually, my original front dust shields have LH and RH after the part number, not just L and R as the judging manual states for 67. Then, I have some old ones that look ugly enough to be original with only the part number (xxxx117 and xxxx118) and no left right stamping of any kind. Anyone else have information to share? Thanks, Gary
          Avatar--My first ever vette, owned 3X since 1977, restored 1993-2024. Top Flight Award 9/14/24
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            • Bryan L.
              Very Frequent User
              • June 30, 1998
              • 397
              #4
              Re: Brake Caliper Backing Plate Numbers

              Gary:

              My 67 backing plates are original. I just got through cleaning them up this past weekend. They have the ----117 and ----118 part #, but no L or R stampings.

              Bryan
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                • Gary S.
                  Super Moderator
                  • February 1, 1984
                  • 456
                  #5
                  Re: Brake Caliper Backing Plate Numbers

                  Bryan..thanks for your response. My gut feeling was that the stamping was not consistent and the judging manual was incorrect. I know mine are original on this car (34K miles) and they are stamped with RH and LH instead of just L and R per the judging manual. Looks like there were three stamping configurations minimum. Gary
                  Avatar--My first ever vette, owned 3X since 1977, restored 1993-2024. Top Flight Award 9/14/24
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