1999 Chevrolet Corvette Owner's Manual - Page 271

yellowblue When to Check and What to Use Refer to the Maintenance Schedule to determine how often you should check the fluid level in your clutch master cylinder reservoir and for the proper fluid. See "Owner Checks and Services" and "Recommended Fluids and Lubricants" in the Index. Fluid should be added if the fluid level is below the step on the inside of the reservoir. There are additional instructions on the reservoir cap. Replace the rubber seal and cap. Rear Axle When to Check Lubricant Refer to the Maintenance Schedule to determine how often to check the lubricant. See "Periodic Maintenance Inspections" in the Index. How to Check and Add Fluid The clutch master cylinder is on the driver's side of the engine compartment, near the fender. To check the fluid, remove the cap and rubber seal. 6-21