See Figures 1 and 2
The hydraulic clutch system should be bled any time the hoses have been loosened or any component replaced. The bleeding process is quite simple and eliminates any air which has become trapped within the lines.
Add brake fluid to the reservoir. Attach a length of hose to the bleeder nipple on the slave cylinder (at the transmission) and put the other end in a clear glass jar. Put enough brake fluid in the jar to cover the end of the hose.
Have an assistant press the clutch pedal to the floor and open the bleed screw on the slave cylinder. Close off the bleeder while the pedal is still depressed and repeat the process with another application of the clutch pedal. As the bleeder is released each time, observe the fluid in the jar. When no bubbles are coming out of the hose, the system is bled. Secure the fitting, remove the hose and jar, and top up the brake fluid to its proper level.