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Depends on whether it's front or rear, and whether the vehicle is built for the U.S. market or Canadian market. For U.S. models, the rear wheel cylinder bore is 15/16" For Canadian models, the rear wheel cylinder bore is 1" and the front is 1-3/16" No data on the U.S. models front size ... although from looking at pictures it appears to be about 1" (and certainly would be expected to be at least 15/16", since the rears are 15/16". The fronts are generally larger than the rears, though).

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Q: What size is the wheel cylinder on a 66 Pontiac catalina?
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