A brake fill test apparatus that includes a vessel including an interior having a fill chamber, a first sensor chamber, and a second sensor chamber. The vessel also includes at least one port that provides access to the fill chamber. A first valve is configured to provide selective flow communication between the fill chamber and the first sensor chamber, and a second valve is configured to provide selective flow communication between the fill chamber and the second sensor chamber. A first sensor is coupled within the first sensor chamber and a second sensor is coupled within the second sensor chamber. The first sensor is configured to monitor a positive gauge pressure within the interior and the second sensor is configured to monitor a negative gauge pressure within the interior.