Dear Adam.

Your question about how the tracs works is pretty simple.

When the driving wheels start to slip the ABS computer recives a signal

that one wheel is spinning faster than the opposite wheel,so the abs computer will act in a opposit way,it will feel the slip and apply some brake pressure to the slipping wheel trying to slow it down.

But be awere tracs only works good in speeds up to 25mph after that it is your own responsibility to keep track of what you are doing