Abstract: A disc brake assembly having a brake chamber provided with pressurized cooling oil and an annular face seal sealing the hub of the brake assembly to the housing thereof against loss of cooling oil from the brake chamber. A second seal is provided for sealing the hub to the brake housing inwardly of the face seal and structure is provided for conducting lubricating oil from a differential chamber of the assembly to the face seal for maintaining a preselected lubrication and cooling of the face seal while preventing delivery of the pressurized cooling oil from the brake chamber thereto. In one form, the seal for sealing the hub to the brake housing inwardly of the face seal is received in a recess of the housing, and in another form, the seal is carried on a retainer projecting inwardly from the housing to adjacent the hub. The face seals are lubricated by oil delivered from a differential chamber through a passage in the hub.