- 1). Open the hood and inspect the brake master cylinder on the driver's side of the engine bay on the firewall. If the cylinder is leaking, replace it. If the fluid is not between the upper and lower marks on the reservoir tank, you'll need to fill the reservoir tank.
- 2). Press on the brake pedal. If the pedal pressure seems weak or the brake pedal feels "spongy," have the braking system bled. If the brake pedal is firm at first and slowly sinks to the floor, there is an internal leak in the car's master cylinder. This will cause the pedal to sink to the floor but you won't see any brake fluid loss.
- 3). Check for brake-fluid loss under the vehicle while an assistant presses on the brake pedal. Any fluid leaks indicate a leak in the system. The brake lines will need to be replaced.
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