66 is tapered as at 70 and engages a corresponding socket 72 provided in the steering knuckle 26 a bolt 74 extends through the sleeve 66 and is fastened to the steering knuckle 26 to thereby retain the sleeve 66 to the knuckle 26 it is noted that the clearance between the bolt and the sleeve is not critical since the sleeve is held to the steering knuckle 26 by the axial force between the head of the bolt and the end of the sleeve appropriate boots 76 are provided to keep dirt and other contaminants from interfering with the sliding action of the caliper 52 upon the sleeve 66 to prevent rotation about the pin like element 64 during braking the caliper 52 is restrained by a tongue in groove connection generally indicated by the numeral 78 between the caliper 52 and the arm 32 of the knuckle 26 as can be seen most clearly in fig3 the groove 46 in the arm 32 is axially longer than is the groove 44 in the arm 34 and thus the groove 46 defines the groove portion of the tongue in groove connection 78 a projection 80 extends from the caliper 52 and is received in the groove 46 to thereby define the tongue portion of the tongue in groove connection 78 it will be noted that the clearances between the projection 80 and the groove 46 are not critical nor is the distance between the tongue in groove.