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Old 02-20-2022, 07:44 PM
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67drake 67drake is offline
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Default Wheel cylinder diameter ‘71 GTO manual drum

I can’t find my manual, and would prefer not to pull a wheel this time of year.
Anyone know the FRONT wheel cylinder diameter on a manual brake drum car?
Thanks in advance.
BTW, I did a search and couldn’t find an old thread with the info.

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71' GTO -original 400/4-speed/3.23 posi
13.95 @ 102.1 on street tires @ 4055lbs.

‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears.
  #2  
Old 02-20-2022, 09:32 PM
gto4evr gto4evr is offline
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you're talking about the bore size correct? 1-1/8 on the fronts and 7/8 on the rears

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Old 02-20-2022, 10:10 PM
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67drake 67drake is offline
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Yes, cylinder bore.
Thanks!
Seeing as how master cylinder rebuild kits aren’t available anymore, it wouldn’t hurt to have a few wheel cylinder kits on the shelf either.

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71' GTO -original 400/4-speed/3.23 posi
13.95 @ 102.1 on street tires @ 4055lbs.

‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears.
  #4  
Old 02-21-2022, 03:38 PM
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pggto pggto is offline
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https://www.opgi.com/brake-systems/m...caAl-uEALw_wcB

  #5  
Old 02-21-2022, 03:43 PM
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Scott Thelander Scott Thelander is offline
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I have original delco cores and rebuild kits for the
fronts if needed ,,,
Scott

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Old 02-21-2022, 03:47 PM
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67drake 67drake is offline
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Quote:
Originally Posted by pggto View Post
Thanks,I should have been more specific, but that’s for a disk brake master cylinder. The one for manual drums are unavailable.

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71' GTO -original 400/4-speed/3.23 posi
13.95 @ 102.1 on street tires @ 4055lbs.

‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears.
  #7  
Old 02-21-2022, 03:52 PM
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67drake 67drake is offline
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Quote:
Originally Posted by Scott Thelander View Post
I have original delco cores and rebuild kits for the
fronts if needed ,,,
Scott
Thanks! I ordered a couple spare kits from RockAuto already though last night.

__________________

71' GTO -original 400/4-speed/3.23 posi
13.95 @ 102.1 on street tires @ 4055lbs.

‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears.
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