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Home >> Volvo >> 1998 >> S70 Base, Automatic >> Repair and Diagnosis >> Brakes >> Anti-Lock Brake System - With Traction Control >> Description & Operation >> TRACS Control System (TRACS)

TRACS Control System (TRACS)

TRACS is a traction control system integrated with ABS. TRAC is engaged at all times, and can only be disengaged by switch on instrument panel.

If ABS/TRACS module detects that one drive wheel is turning faster than another, via front wheel sensors, TRACS closes the inlet valve and activates pump, applying brake fluid to slipping wheel's brake caliper. This builds pressure in brake circuit, applying brakes just enough to ensure maximum engine power is applied to drive wheel with most grip.

ABS/TRACS module monitors how much brakes are being used and calculates temperature in front brakes. If TRACS is engaged and temperature becomes too high, TRACS is disabled and TRACS warning light comes on. After temperature decreases, TRACS re-engages. ABS is unaffected.