ANTI-LOCK BRAKING SYSTEM AA

INTRODUCTION  The Anti-lock Braking System commonly pronounced as (ABS) is a four-wheel system that prevents wheel lock-up by automatically modulating the brake pressure during an emergency stop.  Anti-lock brakes allow you to maintain steering during emergency braking.

Why do you need ABS ? Suppose if you hit the brakes hard and try to steer, your car doesn't react to the steering wheel anymore and just skids out of control. This happens, because all the wheels are locked up while you are holding down the brake pedal.

TYPES OF ABS Four-channel, four-sensor ABS They can be differentiated by the number of channels: that is, how many valves that are individually controlled and the number of speed sensors. Basing on this there are four types: Three-channel, four-sensor ABS Three-channel, three-sensor ABS One-channel, one-sensor ABS

BASIC COMPONENTS  Speed sensors  Pump  Valves  Controller

These valves are controlled by signals sent by speed sensors depending on wheel speed.

How does it work?  Before ABS, if you slammed on the brakes, your wheels would lock and you would eventually come to a screeching halt.  To prevent you from skidding out of control, people were taught to pump their brakes. This prevented wheel lock up.  Today, we don't need to pump the brakes because ABS does that for us.  A typical ABS system will pump the brakes about 15 times per second, far faster than any driver.

Speed sensors are located at each wheel. When these sensors 'sense‘ that a tire has stopped moving (the wheel is locked under braking) the sensor sends a message to the controller that in turn regulates the brake pressure to reduce lock-up. It 'pumps' the brakes over a dozen times per second by increasing brake pressure and reducing it, over and over again. Since the wheels are not locked up, a driver can swerve to avoid an obstacle while under hard braking. anti-lock brakes benefit you in two ways: You'll stop faster, and you'll be able to steer while you stop.

Examples Apache RTRHonda CBR 250R MAURTI SWIFT VDI AUDI Q7

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