The Carlisle Brake & Friction single circuit and parallel circuit, modulating hydraulic control valves are capable of providing modulating output pressures in a range of 600-3,500 psi (41 to 241 bar). Each pedal can be independently set for output pressure to enable complete control of brake system on the vehicle. Treadle Pedal force ranges from 45 to 68 pounds (200-300 newton) for the dual valve depending upon output pressure. The treadle pedal force for the single valve ranges from 17 to 56 pounds (75-250 newton) depending upon output pressure. The Carlisle 2102 Series In-Line retarder/ brake control valve provides electric retarder control with sensor output plus hydraulic brake modulating control in one component for easy installation and reduced system cost. Retarder control is achieved using a contactless rotary sensor. The sensor provides a dual redundant output signal, either 5 or 10 VDC, for the retarder control.