To provide a steering axle assembly comprising a wet disc brake capable of elongating life by rotatably mounting a steering knuckle portion of a bruckle to a tubular yoke, and integrally forming the steering knuckle portion and a brake housing portion.

An outer end of a tubular yoke 12 is mounted on an axle tube 14 of an automobile in a steering axle assembly 10. An axle 16 projecting from a differential is mounted in the axle tube 14 and rotated about a central axis 18. A bruckle 48 of a single structure has a steering knuckle portion 52 and a brake housing portion 54, and the steering knuckle portion 52 is rotatably mounted on a tubular yoke 12 by means of upper and lower ball joints 68, 70. On the other hand, in a disc brake assembly 50, a sleeve member 88 and a driving disc 84 are rotated about the central axis 18 together with an axle hub 34, and a tubular intermediate disc 92 is fitted to the brake housing portion 54.