Abstract: Air brake slack adjusters having fouled locking collar mechanisms can be packed with grease in the absence of an effective lubrication fitting to free-up their moving parts by encasing the exterior adjusting head and locking collar in a high pressure lubrication chamber, and injecting lubricant therein by means of a conventional grease gun. The device provides an important economic advantage by lowering vehicle maintenance costs by substantially reducing the frequency of slack adjuster replacement.