Why not?

[PhilC]

Once the ideal tire pressure is determined for a particular situation, why not use a pressure relief valve to ensure you keep that pressure? Is it common practice or is there a good reason not to do it?

 

[Anthony - 98 GTS]

Hitting a pothole or a sudden change is direction would exert a temporary force on the tire increasing internal pressure and thus releasing air from the tire.

When you return to a normal driving condition you would be under inflated.