Laser L4-1997cc 20L DOHC (1990) Brake Proportioning Valve Specs
Brake Proportioning/Combination Valve: Description and Operation
Combination valves containing brake warning or pressure differential type valves are self-centering. They will reset after hydraulic system pressure is
equalized, and after the following procedure: Upon completion of bleeding the hydraulic system, depress the brake pedal with moderate force. The brake
warning lamp will turn off when the switch is becomes centered.