Wabco ECU/Valve Assembly S4005001010 / S400-500-101-0
TCS11 ABS 2S/1M
This is a single modulator (1-valve), 2-wheel sensor ECU unit. It consists of a Wabco S4721950330 single modulator service valve, with a Wabco S4461082010 2-wheel sensor ECU mounted on top. When identifying this unit, there will be both a valve metal ID tag & a ECU metal ID tag.
This unit came into use after 2002 & is common on trailers with a 2-wheel ABS sensor system.