Brakes on 1994 Cadillac Seville SLS

Where is the safety valve in the the braking system which activates in emergency situations. I am told it is either in the master cylinder or abs module. It is sticking and needs to be repaired. Could anyone confirm one way or the other?

1 answer
The ABS Module protects you in a Emergency however if the master cylinder is faulty it can cause problems with the ABS Module is the ABS light on? if so get a diagnostic so you can pinpoint where the problem is.