Brake Pedal Sinks to Floor When Brake is Apply

Brake pedal sinks to floor when the brake pedal is slightly depressed.

Troubleshooting car problems of brake pedal that sinks to floor
When brake pedal sinks even when the pedal is slightly depressed indicates problem with the master cylinder, specifically an internal leak is occur. Master cylinder contains a primary and secondary piston that operates on either front or rear brakes. Both pistons is sealed with a cup, when the cup is damage the brake fluid will leak causing the brake pedal to sinks up to flooring even when the brake is slightly applied.
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