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A seal for use with an annular piston which may be used in a hydraulic system for actuating disc brakes or clutches of drivetrain subassemblies. The seal may be used with a piston having a relatively large average diameter and a relatively small radial thickness, with the piston being disposed, and

A seal for use with an annular piston which may be used in a hydraulic system for actuating disc brakes or clutches of drivetrain subassemblies. The seal may be used with a piston having a relatively large average diameter and a relatively small radial thickness, with the piston being disposed, and axially moveable, within an annular passage having a pair of generally cylindrical, opposing side walls. The seal is made of an elastomeric material and comprises first and second annular flange portions having a first end attached to the base portion and a second, free end. Each of the flange portions diverge away from the base portion so as to dispose the corresponding free end in sealing engagement with one of the passage sidewalls. The base portion of the seal is bonded to an end surface of the piston and the seal further includes a plurality of circumferentially spaced ribs interconnecting the first and second flange portions.

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A seal for use with an annular piston disposed within a housing, the piston having a high pressure end portion disposed within an annular passage formed within the housing, the piston being axially moveable within the housing, the passage having a pair of generally cylindrical opposing sidewalls, sa

A seal for use with an annular piston disposed within a housing, the piston having a high pressure end portion disposed within an annular passage formed within the housing, the piston being axially moveable within the housing, the passage having a pair of generally cylindrical opposing sidewalls, said seal comprising: an annular base portion; a first annular flange portion having a first end attached to said base portion and a second, free end, said first flange portion extending radially and axially away from said base portion so as to dispose said free end in sealing engagement with one of the sidewalls of the passage; a second annular flange portion radially spaced from said first flange portion, said second flange portion having a first end attached to said base portion and a second, free end, said second flange portion extending radially and axially away from said base portion so as to dispose said free end in sealing engagement with the other of the sidewalls of the passage; a plurality of circumferentially spaced and transversely extending ribs interconnecting said first and second flange portions; wherein said base portion is in contacting engagement with an end surface of the piston and wherein said base portion, said first and second flange portions and said ribs are made of an elastomeric material.