Abstract: A vehicle brake slack adjuster of the type having a housing pivotally connected to a vehicle brake operator and enclosing a slack adjusting mechanism operably coupled to a vehicle brake operating system and a linkage for operably coupling the vehicle brake operator to the slack adjusting mechanism, characterized in that the linkage includes an outer part having inner and outer ends with the outer end being pivotally coupled to the vehicle brake operator and the inner end mounting a gear rack, an inner part having an outer end mounting a gear rack and an inner end coupled to the slack adjuster mechanism and a rotatable gear engaged with each of the gear racks.

Abstract: An automatic slack adjuster operating to effect reduction of slack present in a vehicle brake system upon brake release incorporates a member cooperating with a slack adjusting rotor to determine a reference position for the rotor and to return the rotor to such reference position at the completion of each brake operational cycle.