A device for checking gap tolerance between an adjustable portion of a brake switch and a brake pedal includes a handle and one or more probes extending from the handle. Each of the one or more probes include jaw portions defining multiple stepped regions of increasing thickness with decreasing distance from the handle and a slot extending through the multiple stepped regions. The slot is configured to be inserted between the adjustable portion of the brake switch and the brake pedal. A dimensional tolerance of the slot in at least one of the stepped regions equals a preset gap tolerance between the adjustable portion of the brake switch and the brake pedal.