For vehicles with a manual transmission, it is not necessary to regularly check brake/clutch fluid unless there is a leak suspected.
Adding fluid will not correct a leak.
A fluid loss in this system could indicate a problem. Have the system inspected and repaired.
When to Check and What to Use

The brake/hydraulic clutch fluid reservoir cap has either a symbol or text specifying the type of brake fluid. The common brake/clutch fluid reservoir is filled with GM approved DOT 3 brake fluid as indicated on the reservoir cap.
How to Check and Add Fluid
Visually check the brake/clutch fluid reservoir to make sure the fluid level is at the MIN (minimum) line on the side of the reservoir. The brake/ hydraulic clutch fluid system should be closed and sealed.
Do not remove the cap to check the fluid level or to top off the fluid level.
Remove the cap only when necessary to add the proper fluid until the level reaches the MIN line.
Manual Transmission Fluid
Engine Air Cleaner/FilterFront Side Door Window Regulator Motor Replacement
Preliminary Procedure
Remove the front side door window regulator. Refer to Front Side Door Window
Regulator Replacement.
Front Side Door Window Regulator Motor Screw (Qty: 3)
Caution: Refer to Fastener Caution in the Preface section.
Tighten
9 N·m (80 lb in)
Front Side Door Wind ...
Radio Reception
Frequency interference and static can occur during normal radio reception if
items such as cell phone chargers, vehicle convenience accessories, and external
electronic devices are plugged into the accessory power outlet. If there is interference
or static, unplug the item from the accessory p ...
Stationary Window Waterleak Repair
Note: If any water enters the vehicle interior up to the level of
the carpet or higher and soaks the carpet, the sensing and diagnostic
module (SDM) and the SDM harness connector may need to be replaced. The SDM
could be activated when powered, which could
cause deployment of the air bag(s) an ...