Hydraulic brake system with improved filler cap

Claim 1

IN A HYDRAULIC BRAKE SYSTEM INCLUDING A MASTER CYLINDER AND A RESERVOIR FOR SUPPLYING BRAKE FLUID TO THE MASTER CYLINDER, IN COMBINATION, A CLOSURE DEVICE ON THE UPPER PART OF THE RESERVOIR COMPRISING A CAP HAVING WALLS DEFINING AN OPENING EXTENDING THROUGH THE CLOSURE DEVICE, A MOVABLE MEMBER HAVING A STEM TELESCOPED THROUGH SAID OPENING AND EASILY MOVABLE WITH RESPECT TO SAID OPENING, SAID OPENING BEING LARGER IN CROSS-SECTION THAN SAID STEM TO PROVIDE VENT MEANS THROUGH THE OPENING WHILE THE STEM IS TELESCOPED THERETHROUGH, A COVER MOUNTED ON THE UPPER END OF THE STEM, SAID COVER BEING DISPOSED OUTSIDE THE CAP AND BEING IN THE GENERAL FORM OF A ROOF OVER SAID OPENING TO PROTECT SAID OPENING FROM ENTRY OF DUST AND OTHER FOREIGN MATTER, SAID COVER HAVING MEANS FOR MAINTAINING OPEN SIDES UNDER THE COVER TO PERMIT BREATHING BETWEEN SAID OPENING AND THE OUTSIDE ATMOSPHERE, AND FLOAT MEANS CARRIED ON THE LOWER END OF SAID STEM IN OPERATIVE POSITION TO BE ACTUATED BY CHANGE IN THE LEVEL OF THE BRAKE FLUID CARRIED IN THE RESERVOIR DURING OPERATION OF THE HYDRAULIC BRAKE.