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Correct Brake booster bore size.

Old Jul 27, 2018 | 06:47 PM
  #1  
ragtopblue's Avatar
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Question Correct Brake booster bore size.

Evening all !
While at the OCA Nationals I might be looking for a Brake booster and Master cylinder set up to install during my front end rebuild and front disk brake conversion this Summer. So here is my question regarding the brake booster. I will be using an 11 inch Delco Moraine brake booster, since that was what was original on the car. I needed to know the booster's bore diameter size that would be correct for my 1972 Cutlass Supreme with power brakes, front and rear drums at this time. I don't want to pull mine at this time since all is good and I don't want to jinx the car 4 days before the OCA meet.
Old Jul 28, 2018 | 05:49 AM
  #2  
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Originally Posted by ragtopblue
Evening all !
While at the OCA Nationals I might be looking for a Brake booster and Master cylinder set up to install during my front end rebuild and front disk brake conversion this Summer. So here is my question regarding the brake booster. I will be using an 11 inch Delco Moraine brake booster, since that was what was original on the car. I needed to know the booster's bore diameter size that would be correct for my 1972 Cutlass Supreme with power brakes, front and rear drums at this time. I don't want to pull mine at this time since all is good and I don't want to jinx the car 4 days before the OCA meet.
The brake booster doesn't have a "bore". I assume you are talking about the master cylinder? Stock disc brake M/C would have been 1.125" bore. Drum brake M/C was 1.0".
Old Jul 28, 2018 | 08:05 AM
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Bore size

Originally Posted by joe_padavano
The brake booster doesn't have a "bore". I assume you are talking about the master cylinder? Stock disc brake M/C would have been 1.125" bore. Drum brake M/C was 1.0".
Greg thank you for the clarification and the information ! Look forward to meeting you at the Nats ! What car are you bringing from the collection ?



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