The Johnston 179543140 ALB Valve is a genuine OEM component designed for Johnston sweeper brake systems. This Automatic Load Sensing Brake Valve ensures precise and efficient braking performance by adjusting brake pressure based on the vehicle's load. Essential for maintaining safety and operational integrity in various Johnston sweeper models, including VT650, VT800, VS650, VS800, CN201, and CN401. This critical brake system part helps optimize braking force, preventing wheel lock-up and enhancing vehicle stability.