GMC 1995 Suburban Owner's Manual page 321

Power Steering Fluid
How To Check Power Steering Fluid
When the engine compartment is cool, unscrew the cap and wipe the
dipstick with
a
clean rag. Replace the cap and completely tighten it. Then
remove the cap again and look at the fluid level on the dipstick.
The level should be at the FULL COLD mark. Add enough fluid to bring
the level up to the mark.
A fluid loss in this system could indicate a problem. Have the system
inspected and repaired.
What to Add
Refer to the Maintenance Schedule to determine what kind o f fluid
t o
use.
See "Recommended Fluids and Lubricants" in the Index.
NOTICE:
When adding power steering fluid or making a complete fluid
change, always use the proper fluid. Failure to use the proper
fluid can cause leaks and damage hoses and seals.
Hydro-Boost Brake System (Hydraulic Pump)
The power steering pump is also used
a s
the Hydro-boost pump. Refer to
"Power Steering System" in this section when checking tluid level or
adding fluid.
6-39