Pressure Modulators

One for each front brake, located under front fenders. One for both rear brakes, located next to radiator at right side of engine compartment. Similar in appearance to a vacuum brake booster, each consists of vacuum chamber, by-pass tube, end plate with hydraulic cylinder, air valve, by-pass valve and pressure modulator switch. Both valves are solenoid operated. Spring loaded switch provides warning signal under certain abnormal conditions. Rear modulator air valve connected to amber light on instrument panel. Light indicates system operating each time valve is actuated.