Make the Most of Your Power Stroke's exhaust backpressure valve! BD's BrakeLoc connects to the EBPV control wire, turning the factory valve into an electronically-controlled exhaust brake. Includes the BD AutoLoc to maintain lock-up when the exhaust brake is activated ensuring that 100% of the retarding force is being transferred in 3rd and 4th gears. Note that, because the EBPV is activated hydraulically, there is typically a 2-3 second delay between the time the valve is actuated and engine retarding occurs. While the BrakeLoc is an economical alternative to an exhaust brake, it is NOT intended as a substitute. For quicker, more effective braking, we recommend a BD exhaust brake system, which utilizes our Variable Orifice Technology, and won't stick like the stock EPB valve can.Cost effective solution of engine retarding for towing with the automatic transmission on the Ford PowerStrokes; Commands the Exhaust Back Pressure (EBP) valve to activate as well as keeping the lock-up clutch of the torque converter to stay engaged to allow up to 100% of the retarding force to be transferred while in 3rd and 4th gear; Transmission oil temperatures will remain low because of little or no slippage occurring in the converter in these gears; For more efficient retarding use or medium to heavy loads use BD Exhaust Brake 2033143, 2023144, 1037143 or 1027144; Our goal is to be an innovative company and a world class manufacturer that distributes products Worldwide for North American Diesel vehicles.; Our goal is to be an innovative company and a world class manufacturer that distributes products Worldwide for North American Diesel vehicles.