Pressure cracks are usually formed on the board when the bolts are tighten too tightly. It leaves very less room for the board to suck in the impact while doing tricks. Even humidity plays a role in creating pressure cracks. As wood expands/contracts based on humidity level, if you tighten the nuts too tight it'll create a crack if there is pressure being built up. The pressure cracks are usually formed near the bolts.
To avoid pressure cracks first thing is do not over tighten the nuts and bolts which mounts the truck on the deck. Give some breathing space for the hardware to suck in the impact while doing tricks. Another very effective solution is to use riser pads(Rubber ones). Riser pads acts as suspension for the skateboard and helps in absorbing most of the impact. If you take care of the above things you'll avoid developing pressure cracks to a large extent for sure. Do not keep your board in damp/wet areas or where there is more humidity.
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