Brake Inspector® from Spectra Products, Inc. is an electronic In-Cab Air Brake Diagnostic system that provides real time indication of air brake activity such as brake stroke travel, brake fade, hung up brakes and non-activating brake chambers. When the brakes are applied air brake activity is displayed on the in-cab diagnostic module by a series of LED's that use the international colors of GREEN for go, YELLOW for CAUTION, and RED for STOP.