member 64 which is in turn releasably connected to the casing 20 this separating wall advantageously divides the casing into an inner wet compartment 65 and an outer dry compartment 67 as best shown in fig2 and 3 the brake apparatus 35 includes a parking and emergency brake actuating assembly 66 releasably connected to the casing 20 axially outwardly or to the right when viewing fig1 and 3 of the separating wall 64 such assembly operatively extends axially through and beyond the separating wall when in the active or disc engaging mode of operation more particularly the brake actuating assemby 66 includes a generally diamond shaped brake engaging plate 68 having a pair of axially inwardly extending engagement projections or end fixtures 70 at the opposite ends thereof and a plurality of axially extending cylindrical bores 72 therethrough advantageously the end fixtures 70 extend in sealed relation through a pair of openings 74 in the separating wall to abut and bias the second braking member 58 away from a reaction surface 76 formed on the inside of the separating wall secondly the brake actuating assembly 66 includes a cylindrical housing member 78 having a plurality of cylindrical posts 80 which extend through the bores 72 in the brake engaging plate 68 to make contact with the separating wall 64 thus the housing member is non rotatably coupled to the engaging plate and the engaging plate is non rotatably coupled to the separating wall but both the housing member and engaging plate are axially movable with respect thereto the housing member also.