Brake fluid
The picture shows the brake master cylinder with reservoir. It is filled with DDT-3 brake fluid. There are only two reasons why the liquid level in the tank may go down. The first is that the level drops as a result of gasket wear. When new gaskets are installed, the fluid level rises. The second reason is that fluid is leaking from the brake system. If this is the case, you should have the brake system repaired, as sooner or later the brakes will not work properly or not work at all.
So it's not a good idea to add fluid. Adding fluid will not stop the leak. Add fluid when, when you repair the brake system.
Checking the brake fluid level
You can check it without removing the cover. Just look at the brake fluid reservoir. The fluid level must be above the MIN·mark. If not, find the cause of the fluid leak. After work on the brake hydraulic system has been completed, add fluid to a level above MIN and below the top of the window.
What to add
Use only DOT-3 brake fluid such as Delco Supremell (GM Part N12377967). Use only sealed container.
Always clean the lid and reservoir before removing the lid.
Brake wear
Your vehicle has front disc brakes and rear drum brakes.
Disc brake pads have built-in wear indicators that emit high-pitched warning sounds when the pads are worn and new ones are needed. The sound appears and is heard all the time while the car is moving (except when you firmly press the pedal).
Some driving conditions or weather can cause brake squealing when the brakes are still new. This is fine.
Properly fitted wheel nuts are essential to prevent brake pulsation. When the wheels are balanced, check the brake pads for wear.
The rear cylinder brakes do not have indicators, but if you hear rear brake rubbing noise, check the gaskets, and the drums should be removed and inspected every time you remove wheels for replacement or balancing.
When you change the front brake pads, check1 the rear brakes too.
Breaking the brake pedal
If the brake pedal e returns to normal height or falls when pressed, contact a workshop.