Abstract: A kit of parts to prevent seizing of yoke and link pins of slack adjusters in the braking system of highway tractors includes a replacement yoke pin and a replacement link pin. Both the replacement pins have a hexagonal head for gripping with a suitable wrench or socket tool to rotate the pins. The replacement yoke pin also includes a longitudinal bore which communicates between an outer surface of the shaft of the pin and a nipple at the head to introduce grease to the outer surface of the shaft of the pin. The combination of the longitudinal bore to introduce the grease and the hexagonal head for rotating the pin permits the grease to be thoroughly dispensed about the pin and thereby prevent seizing.