2003 GMC Sierra 1500 Pickup Owner's Manual - Page 407

How to Add Fluid Here's how to add fluid. Refer to the Maintenance Schedule to determine what kind of fluid to use. See Part D: Recommended Fluids and Lubricants on page 6- 18. 1. Remove the filler plug. When to Check and What to Use The clutch master cylinder reservoir is located in the rear of the engine compartment on the driver's side of the vehicle. See Engine Compartment Overview on page5-12 for more information on location. 2. Add fluid at the filler plug hole. Add only enough fluid to bring the fluid level up to the bottom of the filler plug hole. 3. Install the filler plug. Be sure the plug is fully seated. Hydraulic Clutch The hydraulic clutch linkage in your vehicle is self-adjusting. The clutch master cylinder reservoir is filled with hydraulic clutch fluid. It is not necessary to regularly check clutch fluid unless you suspect there is a leak in the system. Adding fluid won't correct a leak. A fluid loss in this system could indicate a problem. Have the system inspected and repaired. 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 Part B: Owner Checks and Services on page 6-1 I and Part D: Recommended Fluids and Lubricants on page 6-18. How to Check and Add Fluid The proper fluid should be addedif the level does not reach the bottom of the diaphragm when it'sin place in the reservoir. See the instructionson the reservoir cap. 5-32