Here's an excerpt from the 1951 Vehicle Information Kit about brakes.

You can see that the 3800 had 12x2 inch front brakes and 14x2-1/2 inch rear brakes.
Attachments
1951 Chevy Brakes.pdf (388.65 KB, 20 downloads)


Kevin
1951 Chevy 3100 work truck
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Photos
1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.