Safety warning means for hydraulic brake system

Claim 1

IN COMBINATION WITH THE MASTER HYDRAULIC CYLINDER OF A VEHICLE HYDRAULIC BRAKE SYSTEM AND A WARNING SIGNAL ON THE VEHICLE''S DASHBOARD, A SAFETY WARNING SYSTEM COMPRISING (A) A HOUSING CONNECTED WITH A MASTER CYLINDER OF A HYDRAULIC BRAKE SYSTEM AND HAVING A FIRST RECESS THEREIN ARRANGED IN FLUID COMMUNICATION WITH THE FLUID SYSTEM OF THE MASTER CYLINDER; (B) A SECOND RECESS IN SAID HOUSING; (C) A FLEXIBLE DIAPHRAGM IN SAID SECOND RECESS, DIVIDING THE SAME INTO AN UPPER AND LOWER CHAMBER, THE UPPER SURFACE OF SAID DIAPHRAGM HAVING AN EXPOSED AREA IN SAID UPPER CHAMBER WHICH IS SUBSTANTIALLY GREATER THAN THE EXPOSED AREA OF THE LOWER SURFACE OF THE DIAPHRAGM IN SAID LOWER CHAMBER IN UNDISTENDED POSITION; (D) BIAS MEANS NORMALLY TENDING TO DISTEND SAID DIAPHRAGM INTO SAID UPPER CHAMBER; (E) AT LEAST ONE FIRST PASSAGE PROVIDING FLUID COMMUNICATION BETWEEN SAID FIRST RECESS AND SAID UPPER CHAMBER AND AT LEAST ONE SECOND PASSAGE PROVIDING FLUID COMMUNICATION BETWEEN SAID FIRST RECESS AND SAID LOWER CHAMBER, THE CROSS-SECTIONAL AREA OF SAID AT LEAST ONE FIRST PASSAGE BEING SUBSTANTIALLY GREATER THAN THE CROSS-SECTIONAL AREA OF SAID AT LEAST ONE SECOND PASSAGE; (F) ACTUATING MEANS MOUNTED ON SAID DIAPHRAGM RESPONSIVE TO MOVEMENT THEREOF; (G) AND SWITCH MEANS ACTIVATED BY SAID ACTIVATING MEANS FOR OPERATING SAID WARNING SIGNAL ON THE DASHBOARD OF A VEHICLE.