Meritor Wabco ECU/Valve Assembly S4005001030 / S400-500-103-0
2S/2M 4S/2M 4S/3M
This is a dual modulator (2-valve), 4-wheel sensor ECU unit. It consists of a Meritor S4008506020 dual modulator service valve, with a S4008506010 4- wheel sensor ECU unit mounted on top. The easiest way to identify is by locating the unit metal tag, with the part # listed (pictured).
This unit came into semi trailer use after the year 2002 & is very common on late model trailers, with a 4-wheel sensor ABS Brake System.
Parts Manager's Note: Looking to replace an obsolete S472-500-013-0 ECU/Valve with a Meritor R955346 upgrade kit? All that is needed is to order the above unit and a S8946073120 adapter cable. These two components create a Meritor R955346 kit. Call for more information.