Patent ID: 8726716

Claim:
A piston insertion force gauge tool for measuring the insertion force of a piston into a bore of a brake caliper, the gauge tool comprising: a housing assembly having an inner housing member at least partially disposed in an outer housing member, the inner housing member and the outer housing member being generally coaxial along an axis, and the inner housing member and the outer housing member being selectively displaceable along the axis with respect to each other; a first end member of the inner housing member and a second end member of the outer housing member are generally perpendicular to the axis and form the ends of the gauge tool; a first open end of the inner housing member and a second open end of the outer housing member are generally perpendicular to the axis, the inner housing member being received into the outer housing member at the second open end; a measuring device disposed within the outer housing member and within the inner housing member, wherein the measuring means extends from the second end member of the outer housing member through the first open end of the inner housing member and to the first end member of the inner housing member; wherein the measuring device imparts a force to insert the piston into the bore, and the measuring device displaces the inner housing member with respect to the outer housing member to indicate the insertion force imparted on the piston; and a lock disposed on the outer housing member and configured to prevent the displacement of the inner housing member relative to the outer housing member, wherein the lock is a thumb screw.