T4 ABS – Problems

meal, does anyone know about the abs system? I would have liked to know exactly where the valve relay is for the abs. is it a separate relay in the engine room, or is it located in the module of the pump motor. if the latter should be the case, is the question whether it is interchangeable? would like to save me the aaaaaaaaaaaaassssig expensive purchase of a complete module of 1000eus. am grateful about every tip and experience around the abs. the scare