For 1990-2009 cars

1. Inspect for a cracked master cylinder casting or brake fluid around the master cylinder. Leaks are indicated only if there is at least a drop of fluid. A damp condition is not abnormal.
2. Inspect for a binding pedal linkage.
3. Disassemble the master cylinder.

3.1. | Inspect for swollen or stretched piston seal(s).

3.2. | If swollen seals are found, substandard or contaminated brake fluid should be suspected.

3.3. | Disassemble and clean all contaminated components.

4. Replace all of the rubber components. Flush all of the brake hoses and the pipes.