Actually, there's a little more to it than that.
The magnets on the # K23-478-479 are a little different, but the primary difference is the mounting bolt pattern. On a typical 3500 lb brake assembly, the mounting studs will all be 2-7/8 inches apart on center. On the # K23-478-479 4400 lb brake assembly, the top studs are 2-7/8 inches apart, but the bottom ones are spaced a bit further apart to prevent a 3500K brake assembly from being used on a 4400K axle. view full answer...
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