Abstract: A pump cartridge for use in a hydraulic braking system includes a sleeve having an outer surface and an inner bore. A piston has a first portion that is coaxially received within the sleeve inner bore. A second portion of the piston extends from the sleeve and is configured to reciprocate the piston first portion relative to the sleeve in response to rotation of an eccentric. A retainer engages the sleeve and is configured to maintain the first portion of the piston within the sleeve inner bore. A filter assembly is formed as a separate component and has a bore configured to permit the piston second portion to extend through the filter bore.

Abstract: A pump cartridge for use in a hydraulic braking system includes a sleeve having an outer surface and an inner bore. A piston has a first portion that is coaxially received within the sleeve inner bore. A second portion of the piston extends from the sleeve and is configured to reciprocate the piston first portion relative to the sleeve in response to rotation of an eccentric. A retainer engages the sleeve and is configured to maintain the first portion of the piston within the sleeve inner bore. A filter assembly is formed as a separate component and has a bore configured to permit the piston second portion to extend through the filter bore.

Abstract: A pump apparatus includes a housing having a bore formed therethrough. A piston is disposed within the bore for reciprocal movement therein. The piston includes a piston body, and an inlet flange extending radially outwardly from the piston body. An outer peripheral surface of the inlet flange and a wall of the bore define a first passageway. A retaining flange extends radially outwardly from the piston body and have a substantially square transverse section. An outer peripheral surface of the retaining flange and the wall of the bore define a second passageway. An intermediate portion is disposed between the inlet flange and the retaining flange. An annular seal is disposed around the intermediate portion of the piston body. The seal slidingly engages the wall of the bore, and the seal and the piston cooperate to form a check valve assembly.

Abstract: A pump assembly with a combination reciprocating high-pressure seal and fluid inlet check valve for use within brake systems. The pump assembly comprises a housing having a bore formed therethrough and a piston disposed within the bore for reciprocal movement therein. An annular seal is disposed around the piston for reciprocal movement thereon. The piston has at least one passageway formed therein. An inlet flange portion of the piston has at least one passageway formed therein. The passageway, the piston, and the annular seal cooperating to form a check valve assembly. The check valve assembly divides the bore into an inlet chamber and a pumping chamber. The annular seal is moveable to a first position relative to the piston in which the check valve assembly is in a flow-through position to fill the pump chamber with fluid from the inlet chamber during a fluid inlet stroke.