1996 Chevrolet S10 Pickup Owner's Manual - Page 247

When to Check and What to Use How to Check The proper fluid should be addedif the level does not in reach the^ bottom of the diaphragm when it's in place 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 thelubricant and when to change it. See "Scheduled Maintenance Services" in the Index. 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. 6-21