ANTI LOCK BRAKING SYSTEM (ABS) INTRODUCTION In addition to the conventional hydraulic brake system, an Anti-lock Braking System (ABS) incorporating Electronic Brake Distribution (EBD) is provided In TATA vehicle. During a normal braking event EBD replaces the pressure conscious regulating valve (PCRV) and limits the level of braking force transmitted to the rear wheels. The advantage of EBD over a PCRV is that it can moderate the braking forces at the rear axle depending upon the load condition and available friction at the rear wheels. During an emergency braking event the ABS regulates the braking force for each individual wheel. In doing so the system optimizes the level of braking being achieved while maintaining a stable, controllable vehicle. The EBD only acts on the rear wheels, whereas the ABS is able to control each wheel individually and can facilitate pressure hold, release and increase cycles. Both the EBD and the ABS functions work by continuously monitoring and comparing the four individual wheel speeds and reacts when a wheel is detected as loosing grip with the road surface, which happens when a wheel tends to lock during braking. The ABS is designed to be incorporated into the circuits of the foundation brake system, and will not prevent the normal hydraulic operation of the brakes in the event of an ABS failure. Engine Drag Control (EDC) is another feature of ABS. This avoids wheel locking during engine braking.
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