If they do not follow this sequence, proceed with modulator troubleshooting.ĭuring normal, non antilock braking, both solenoids are de-energized (no electrical power). The modulators will exhaust air in the sequence of right front, left front, right rear, left rear. This test will verify if the modulator is functioning pneumatically correct. When the brake pedal is depressed and the ignition turned on, the modulator "chuff" test can be heard. When vehicle power is supplied to theABS ECU, a modulator "chuff" test is performed. The ABS controller is able to simultaneously and independently control the individual modulators. (incoming air from foot, relay or quick release valve)Ī wiring harness connects the vehicle modulators to the controller. The Supply, Delivery and Exhaust ports on the M-30 ™ modulator are identified with a cast, embossed numeral for positive identification.
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