TC/Abs System Safety Features: Overview
WARNING: This page is about a different car, the 1995 Saab 9000. However, it is still accessible from the selected car via links, so may be relevant.
If pressure in accumulator is exhausted, power assistance for front wheel circuits and brake pressure for rear wheel circuit will also be lost. In this condition, braking can only be achieved by means of direct pedal pressure on front wheel circuits.
If fluid level in reservoir is low, there will still be power assistance for front wheel circuits and operating pressure for rear wheel circuit. Both ABS and TCS systems will be disabled.