1994 GMC Sonoma Owner's Manual - Page 238

Hydraulic Clutch The hydraulicclutch in your vehicle is self-adjusting. A slight amount of play (1/4 inch to 1/2 inch) in the pedal is normal. When to Check and Whatto Use Refer to the Maintenance Schedule to determine how often you should check the fluid level in your clutch master cylinder reservoir and what to add. See "Owner Checks and Services" and "Recommended Fluids and Lubricants" in the Index. How to check The proper fluid should be added if the level does not reach the bottom of the diaphragm when it's in place in the reservoir. See the instructions on the reservoir cap. Rear Axle When to Check and Change Lubricant Refer to the Maintenance Schedule to determine how often to check the lubricant and when to change it. See "Scheduled Maintenance Services" in the Index. 6-20