Hydraulic Modulator/Pump Test

Turn ignition off. Depress brake pedal 25 times. Turn ignition on. BRAKE and ANTI-LOCK lights should come on for 2-60 seconds. Pump should operate for 2-60 seconds, then turn off. If lights do not come on, check wiring and warning light bulbs, and retest. Also check bulb(s). If lights come on, then turn off, and pump operates for 60 seconds maximum, then turns off, go to next test. If pump does not operate and all other preceding tests have been performed, replace hydraulic modulator/pump.