Patent ID: 6929104

Claim:
A dual circuit pilot master cylinder for a brake system, comprising: a cylinder housing having top and bottom sides and fittings for attachment of the cylinder housing to a vehicle dash panel; a pair of cylinders in the cylinder housing which are disposed to be parallel to one another and to extend vertically into the cylinder housing from adjacent one of the sides of the cylinder housing; a pair of pistons, a different one of which is disposed in each cylinder for reciprocating motion; a linkage including a foot actuated lever coupled to the pair of pistons for imparting to the pistons plunging motion into the cylinders; the pair of cylinders extending from adjacent the top side of the cylinder housing into the housing toward the bottom side; the linkage further including a crank fulcrum positioned with respect to the top side of the cylinder housing; a lever fulcrum positioned with respect to the bottom side of the cylinder housing; a crank having opposing ends mounted for pivoting movement in the crank fulcrum; piston rods extending from the pistons out of the cylinders for connection to ends of the crank on one side of the crank fulcrum; a lever mounted in the lever fulcrum having ends on opposed sides of the lever fulcrum; a push rod extending from below the bottom side of the cylinder housing to above the top side of the cylinder housing and connected at opposite ends to free ends of the lever and the crank, respectively; and a pedal disposed on the end of the lever opposite the end connected to the push rod.