ABS control unit

ABS control unit Mazda 626 Hello, today I had the error memory of my Mazda 626 Kombi Bj.98 read out after the ABS/TCS people are always on.The error codes 53 and 54 were displayed.According to Mazda the control unit (467€) or the hydaulic part (1455€) must be renewed.Can someone tell me if that is true.