A brake wear measurement apparatus for use on a brake assembly equipped with a wear pin having a diameter and an exposed height, which comprises a plunger sleeve having a first end and a second end, and an inner diameter larger than the wear pin outer diameter; a plunger slidably mounted in the plunger sleeve having a corresponding first end and second end and wherein the plunger first end is exposed, such that when the brake wear measurement apparatus is placed over the wear pin, the wear pin contacts the plunger first end, and moves the plunger within the plunger sleeve a retraction distance delta, which corresponds to the wear pin exposed height; a plunger stop mechanism, which prevents the plunger from sliding out of the plunger sleeve when no external force is applied to the plunger; and, a locking mechanism, wherein the locking mechanism acts to prevent the plunger from sliding within the plunger sleeve when the locking mechanism is engaged. The apparatus may further comprise a brake wear correlation program whereby the input of a brake part number, a plunger retraction distance delta, and a number of performed landings will result in an output of an estimated number of remaining landings.