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The Bendix ADB22X air disc brake is now optional on steer and drive axles for Kenworth and Peterbilt Class 8 tractors. Testing indicates that the ADB22X meets NHTSA's 20%-30% stopping-distance reduction proposal, eliminates brake fade with no degradation of stopping power, and allows straight, stable stops due to high brake efficiency and low hysteresis, according to Bendixwww.foundationbrakes.com