Abstract: An automatic slack adjuster (10) having a lever housing (30) containing interior components to be lubricated and defining a first bore (36) in which a worm gear (38) is received, a second bore (42) intersecting the first bore in which a worm (44) and worm shaft (52) are received and a third bore (54) in which a drive mechanism (72 & 66) for rotating the worm shaft is received is provided. A lubricant fitting (150) is provided into the first bore and a passage (152) is provided between the first and third bore. Seals are provided to seal the exterior openings of the bores. The passage (152) defines in part a lubricant path between the fitting and the exterior opening (73) to the third bore which is configured so that the resistance to the flow of lubricant from the fitting (152) to the exterior opening (73) of the third bore is greater than the resistance to the flow of lubricant between the fitting and any other interior component to be lubricated.