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should be a 4 channel nippondenso unit most front drive cars come this way . a 1 channel unit is used in the rear of pick up trucks to keep the rear wheels from locking up . never heard of 3 channel . 4 channel has to be used in front drive as there isnt a spinning solid axel for a rear speed sensor to read . now how the abs unit controlls this and pulses the brakes is where you get the diffrences in the 4 channel units . from what i can see on the g it pulses the rears at the same time and controlls the fronts indepently of eachother as i can find only 3 dump/isolate solenoids . so in our cars case maybe it is a 4 channel non integral unit as the solenoid block is seperate from the master cylander . coarse this depends on your school of thought some comapnys say a 4 channel is one that has 4 wheel speed sensors but pulses the rears at the same time on each side and others say its 4 wheel speed sensors and a unit that controlls each wheel independently . my advice: talk to a service rep at your dealer
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