The Bendix+ E-10 dual brake valve is similar to the E-6+ dual brake valve except that a metal coil spring housed in an upper body assembly replaces the rubber spring used in the E-6+ valve The use of a metal coil spring -and the upper body assembly- provides greater treadle travel and, therefore, provides the driver with a less sensitive -feel- when making a brake application The E-10 dual brake valve is generally used on buses, where smooth brake applications contribute to passenger comfort