This rear brake modulator is the core control unit of the truck EBS braking system. It adjusts rear axle brake pressure in real time according to wheel speed signals, prevents wheel lockup during emergency braking and maintains vehicle directional stability. The integrated electronic and pneumatic structure adopts precision casting housing with good pressure resistance and sealing performance. It can operate stably under heavy load and complex road conditions. Every brake modulator undergoes air tightness and signal testing before delivery. It resolves faults such as EBS warning light activation and poor brake response, serving as a vital replacement spare part for heavy truck brake system overhaul.