3_01_2009/86804PistonSeal_00000041859.jpg” border=”0″ ” align=”right” alt=”one area of wear is the seal between the piston and bore. the seal must prevent fluid from flowing between the two surfaces without creating excessive amounts of friction. if the seal allows to much fluid to pass, it will influence how the valves in the piston and base perform. if the fluid becomes contaminated, it can cause wear to the bore and piston. according to some shock and strut suppliers, wear on these surfaces does not happen until the unit has become significantly degraded. “/>