Exhaust Brake Proportional Control Valve 4088579 / 21380002 for Volvo FH12, FM, NH Trucks (2002–2012)Product Overview Part Name: Exhaust Brake Proportional Control Valve Part Numbers: 4088579 21380002 Vehicle Compatibility: Compatible with Volvo FH12, FM Series, and NH Series Trucks (20022012) equipped with engine exhaust braking systems. Configuration: Heat resistant proportional exhaust brake valve designed for precise engine braking control. Function: Regulates exhaust brake pressure to improve downhill control, reduce service brake usage, and
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Exhaust Brake Proportional Control Valve 4088579 / 21380002 for Volvo FH12, FM, NH Trucks (2002–2012)