Beechcraft C23 and 76 parking brakes
 

Hello,

I hope to get an advice from a person familiar with Beechcraft C23 Sundowner and/or Duchess76 - aircraft we have in fleet.
The problem is that the parking brakes doesn't keep still aircraft when full power applied - it starts moving. New parking brake kits were bought and installed. Problem remain.
May be this is as it shall be with these aircraft, or parking brakes shall not let aircraft moving after full power applied?