If the brake warning light comes on when you apply the brakes,
or is on continuously, it means that hydraulic pressure has been
lost in one side of the brake system or that the fluid level in
the master cylinder is dangerously low (due to a leak somewhere
in the brake system). In either case, the fluid level in the master
cylinder should be checked. Adding brake fluid to the master cylinder
reservoir may temporarily solve the problem. But if there's a
leak, the new fluid will soon be lost and the warning light will
come back on.
Brake fluid leaks are serious because they may cause the brakes
to fail! So avoid driving the vehicle until the system can be
inspected to determine what's wrong. Leaks can occur in brake
hoses, brake lines, disc brake calipers, drum brake wheel cylinders
or the master cylinder itself. Wet spots at hose or line connections
would indicate a leak that needs to be fixed.
Leaking brake fluid can also contaminate the brake linings, causing
them to slip or grab. The uneven braking action that results may
cause the vehicle to veer to one side when the brakes are applied.
Brake shoes or pads that have been contaminated with brake fluid
cannot be dried out and must be replaced.
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