Description & Operation: Notes

NOTE: Information for 2000 9-5 with TC/ABS 5.3 system is not available.

CAUTION: See ANTI-LOCK BRAKE SAFETY PRECAUTIONS article in GENERAL INFORMATION.

Saab ABS 5.3 system is used on V6 equipped 9-5 vehicles and includes a traction control feature. Saab ABS 5.4 system, without traction control, is used on all other vehicles. Traction control equipped vehicles are equipped with one pressure increasing and one pressure relief valve on each front wheel. Both systems are equipped with wheel sensors and ABS hydraulic unit, which includes valve block, control module, and return pump. A wheel sensor at each wheel sends signals to ABS Electronic Control Module (ECM). Wheel sensors calculate wheel acceleration, wheel retardation, car speed, and slip. If any wheel comes near to its locking limit, ABS ECM sends signals to solenoid valves in valve block for wheel concerned. Pressure in wheel brake circuit is modulated so maximum braking force is continually transferred to road surface.

Electronic Brake-force Distribution (EBD) is a function built into the ABS ECM. It controls rear electromagnetic intake valves so optimum braking force is achieved by rear wheels.