Patent ID: 8910758

Claim:
A retarding brake assembly comprising: a brake hub mounted inside a housing of an axle of a machine for movement in an axial direction; an impeller brake mounted inside said housing; and a friction brake mounted inside said housing, wherein said impeller brake and said friction brake are disengaged from said brake hub in a neutral position, said brake hub engages said impeller brake in a first axial movement for retarding rotation of said axle in a first braking position under an action of a first applied hydraulic pressure, said brake hub frictionally engages said friction brake in a second axial movement for frictionally braking rotation of said axle in a second braking position under an action of a second applied hydraulic pressure said first and said second hydraulic pressure are applied to said brake hub, said brake assembly defines a first gap between said impeller brake and said brake hub, and a second gap between said friction brake and said brake hub, said first axial movement of said brake hub under the action of said first applied hydraulic pressure in said first braking position closes said first gap to engage said impeller brake for retarding rotation of said axle, and said second axial movement of said brake hub under the action of said second applied hydraulic pressure in said second braking position closes said second gap to engage said friction brake for frictionally braking rotation of said axle.