The battery one the 95 cutlass supreme is on the from driver side of the car,underneath the washer fluid container.
REGULAR GM ATF FLUID
Most likely brake fluid. Check the master cylinder level.
It could be the brake fluid reservoir is low and is telling you that the brakes need attention.
Equalizer valve not allowing fluid flow to rear?
A 1985 Cutlass Ciera uses type DOT3 brake fluid. It is the standard type of brake fluid for cars with power brakes.
steering fluid reservoirunder hood, passenger side, above serpentine belt.
The 1987 Oldsmobile Cutlass cooling system has a fluid capacity of 5.5 gallons. The cooling system fluid should consist of 50 percent antifreeze.
You add fluid at the same place you check it.
Use only DOT3 brake fluid.
Check the brake fluid.