Brake System: 1- ABS (Anti-lock Brake Skid)

Posted by Wael A. Saad On Tuesday, 8 May 2012 15 comments

There is an old story about a man who was run in front of the old cars to warn people (Danger coming after me).  That is why we need brakes, to not run over this Guy :)
But you will be in a big problem when the brake Stuck with the wheels due to friction overheat, or when your car tires become friction-less with the road, in other words goes over Oil or Ice.

Once the wheel has stopped (stuck) its becomes as fixed-point or hinge and this car will rotate around this point or your car skids so you can not steer your car to the correct direction, thus (Bang) because of unexpected behavior!!!!!!!! 

Some years later. The German firms (Bosch and Mercedes-Benz) had been co-developing anti-lock braking technology, and introduced the first completely electronic 4-wheel multi-channel ABS system in trucks and the Mercedes-Benz S-Class in 1978.



What is ABS?
An anti-lock braking system (ABS) is a system on motor vehicles which prevents the wheels from locking while braking. An anti-locking braking system allows the driver to maintain steering control under heavy braking by preventing a skid and allowing the wheel to continue to forward roll and create lateral control, as directed by driver steering inputs in case of extreme braking circumstances.
 
This is achieved by controlling the rotational speed of every wheel and metering the brake line pressure at the time of skid braking.

Research has shown that  anti-lock brake system can decrease the chance of a vehicle accident by 18%.

ABS System

ABS System parts:
1-    Disc Brake (or Drum brake)
2-    Rotating wheel Sensor
3-    Control Unite
4-    Typical brake components like connections, master, brake pads, etc…

How does it work?

A typical ABS is composed of a central electronic unit, four speed sensors (one for each wheel), and two or more hydraulic valves on the brake circuit. The electronic unit constantly monitors the rotation speed of each wheel.
 When it senses that any numbers of wheels are rotating considerably slower than the others (a condition that will bring it to lock) it moves the valves to decrease the pressure on the braking circuit, effectively reducing the braking force on that wheel.
The wheel(s) then turn faster and when they turn too fast, the force is reapplied.
ABS  

This process is repeated continuously, and this causes the characteristic Pulsing feel through the brake pedal. A typical anti-lock system can apply and release braking pressure up to 20 times a second. The sensors can become contaminated with metallic dust and fail to detect wheel slip; this is not always picked up by the internal ABS controller diagnostic.

Most commonly, braking distances are shortened (again, by allowing the driver to press the brake fully without skidding or loss of control). Disadvantages of the system include increased braking distances under rather rare circumstances and the creation of a "false sense of security" among drivers who do not understand the operation and limitations of ABS  



Press to Watch Brake System Video 1

Press to Watch Brake System Video 2
Press to Watch Brake System Video 3

Read About ABS : Press Here
Read About ESP : Press Here
Read About ESC : Press Here
Read About EBD: Press Here
Read About LSD: Press Here
Read About BAS: Press Here

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