Vehicle brake fluid pressure monitor system

Claim 1

IN COMBINATION WITH AN ELECTRICAL POWER SOURCE AND A SPLIT MASTER CYLINDER, AN ELECTRICAL INDICATING SYSTEM COMPRISING: A FIRST PRESSURE RESPONSIVE SWITCH MEANS INCLUDING A SET OF NORMALLY OPEN CONTACTS AND A SET OF NORMALLY CLOSED CONTACTS WITH A SWITCHING ELEMENT FOR CLOSING THE OPEN CONTACTS AND OPENING THE CLOSED CONTACTS IN RESPONSE TO A PRESSURE FROM SAID SPLIT MASTER CYLINDER; A SECOND PRESSURE RESPONSIVE SWITCH MEANS HAVING TWO SETS OF NORMALLY OPEN CONTACTS AND TWO SETS OF NORMALLY CLOSED CONTACTS WITH A SWITCH ELEMENT FOR SIMULTANEOUSLY OPENING THE CLOSED CONTACTS OF EACH SET AS IT CLOSES THE OPEN CONTACTS OF EACH SET IN ACCORDANCE WITH A SECOND PRESSURE DEVELOPED BY SAID MASTER CYLINDER, ONE SET OF THE NORMALLY CLOSED CONTACTS OPERATIVELY CONNECTED TO THE SET OF NORMALLY CLOSED CONTACTS OF SAID FIRST PRESSURE RESPONSIVE MEANS AND THE OTHER SET OF NORMALLY CLOSED CONTACTS BEING OPERATIVELY CONNECTED TO SAID NORMALLY OPEN CONTACTS OF SAID FIRST PRESSURE RESPONSIVE MEANS; A RELAY INCLUDING AN ACTUATING COIL AND A HOLDING COIL FOR A MAGNETICALLY SENSITIVE SWITCH ELEMENT TO CONTROL A NORMALLY OPEN SET OF CONTACTS WHICH HAVE ONE POLE THEREOF CONNECTED TO SAID ONE SET OF NORMALLY CLOSED CONTACTS OF SAID SECOND PRESSURE RESPONSIVE SWITCH MEANS; AND AN INDICATING DEVICE CONNECTED TO THE OTHER POLE OF SAID SET OF CONTACTS IN SAID RELAY TO BE ACTUATED BY SAID MAGNETICALLY SENSITIVE SWITCH ELEMENT.