Sounds like the clutch master cylinder is leaking internally if there's no external leak. I would do the clutch slave and master as a set
Here are a few guides to read, they will help you figure it out
1. Remove the clutch master cylinder push rod from the clutch pedal.
2. Remove the master cylinder retaining nuts at the front of the dash.
3. Remove the remote reservoir.
4. Disconnect the clutch actuator cylinder line.
5. Remove the clutch master cylinder assembly from the clutch pedal assembly.
1. Install the clutch master cylinder assembly to the clutch pedal assembly.
2. Connect the clutch actuator cylinder line.
3. Install the remote reservoir.
4. Install the master cylinder retaining nuts at the front of the dash.
Tighten the nuts evenly to 21 Nm (15 ft. lbs.).
5. Install the push rod to the clutch pedal.
6. Bleed the hydraulic system.
Hydraulic Clutch Bleeding
Notice: Do not reuse the fluid that has been bled from a system in order to fill the clutch master cylinder reservoir for the following reasons:
1. The fluid may be aerated
2. The fluid may be contaminated
3. The fluid may contain too much moisture
Important: Maintain the fluid level in the clutch reservoir to the top step with GM P/N 12345347, or equivalent.
1. Clean dirt and grease from the cap in order to ensure that no foreign substances enter the system.
2. Attach a hose to the bleeder screw on the clutch actuator assembly. Submerge the other end of the hose in a container of Hydraulic Clutch Fluid GM P/N 12345347, or equivalent.
3. Depress the clutch pedal slowly and hold.
4. Loosen the bleeder screw to purge air.
Tighten the bleeder screw to 2 Nm (18 inch lbs.).
5. Repeat steps 3 through 5 until air is purged.
6. Fill reservoir to the top step with GM P/N 12345347, or equivalent.
7. Repeat the bleeding procedure if necessary.
Diagrams are attached below
Images (Click to enlarge)
Sunday, February 19th, 2012 AT 8:52 PM