Clean off the brake fluid reservoir before removing. Some reservoirs have a FULL mark.
If fluid is low, have the pads/shoes inspected for wear, and the system inspected for leaks.
Red brake warning light
This is usually an indicator of low brake fluid. Be sure to check brake fluid in the master cylinder
reservoir. If it is low, then the brake system should be checked for leaks or worn brake pads or
If the brakes fluid in the reservoir gets too low, air will enter the system and cause a low brake
pedal, and a poor or no stopping condition.
This light is different from the ABS brake warning.
But a problem in the normal braking system can cause the antilock light to come on
How To Check Brake Fluid