Common signs of suspension problems:

Tire Wear
Your tires seem to have excessive or uneven tread wear.
Leaking
Your shocks or struts are leaking fluid.
Damage
Your shock or strut casings are dented or damaged.
Mounts
The shock or strut mounts are broken or worn.
Drifting
Your vehicle seems to float, sway or drift during turns.
Rough Ride
Your vehicle bounces excessively when you hit a bump.
Dip
Your vehicle tends to "nose dive" when you apply the brakes.