Patent ID: 8991171
Filing Date: 2015-03-31
Classification: B60T,F16J

Abstract:
1. A cup for a master cylinder capable of coming into contact with a primary piston or a secondary piston and capable of being subjected to the pressure of brake fluid of a primary chamber and of a secondary chamber, the cup in the shape of a seal with a section like a U on its side, capable of being housed in a groove of a bore of a body of the master cylinder receiving the primary and secondary pistons, an outer lip of the cup being capable of being pressed against a bottom of the groove and an inner lip of the cup being capable of being pressed by an outer surface against one of the pistons, this outer surface having, between an end of the inner lip and a bottom of the cup, a section forming a heel followed by a corrugated profile comprising at least two large grooves and a succession of small grooves capable of forming with the one of the pistons annular cavities trapping brake fluid, said cup ( 60 ) being characterized in that the at least two large grooves ( 622 , 624 ) are bordered: by a first rib ( by a second rib ( by a third rib (