Pump the unit a few times and see if the resistance increases. That is what normally occurs in a damper unit. It is merely that, a damper and not an auxiliary suspension unit, hence no springs or other means of increasing resistance. In operation it is to slow down the oscillations and prevent the front end from bouncing. The springs on the forks control compression and rebound. Also be aware that the operating range of the damper unit is quite short. The normal operating range is only about an inch with 2 inches being about the max on an extreme bump, so the damper unit only needs to move slightly. If the fluid has not leaked out of it the chances are likely that it still functions. They were no big deal to start with!