Do pit bulls brains grow to large for there skull?

No. This Myth was started back in the 70's and 80's for the Doberman Pinscher. It is no more true now than it was then.

The myth was that when beaten, a dog's brain swells, causing it to go crazy and attack.

There was also a general version in which some dog's brains just randomly got too big for their skulls. It doesn't happen, and if it did, the most likely result would be death; not a murderous rampage.

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No. This is not a problem found in pit bulls.

Syringomyelia is a condition that can be found in Cavalier King Charles Spaniel dogs. It causes brain swelling and incredible pain in the those dogs.

Brain swelling leading to aggressive behavior in pit bulls is a myth that was originally attributed to Doberman Pinschers. Neither of these breeds have such a condition.