HEXA

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.