Reads like you have some air in the system, also check under truck for leaking fluid.
Because of the Master cylinders angle air can get stuck at the top.
Remove cap on reservoir and remove the rubber insert
Add brake fluid so it is fairly full, do not put cap back on and do not touch the clutch pedal
get under the truck and open the bleeder on the Slave, 5/16 socket or wrench
This is called gravity bleeding
Let fluid run out and watch for bubbles
DO NOT let reservoir run dry, so close bleeder if you think it is getting low and you still see air bubbles coming out, then add more fluid to reservoir.
reseal the reservoir and drive truck.
If same pedal issue happens then you have air in the Master.
There are several videos and picture posts on how to remove and bleed the Master
Google: ranger clutch master cylinder bleeding
If there is fluid found on the outside of the master when removing it then it is leaking and should be replaced
Last edited by RonD; 10-21-2015 at 02:17 PM.