Anti Lock Braking system (ABS) as the name specifies that applying non-locking wheels mechanism that avoids tires from skidding, moreover tire will continue to move and interact tractively with the road surface and prevent tire from locking and skidding.
How (ABS) it works?
ABS works on a simple theory and concept that a skidding/spinning wheel has less traction than non-skidding wheel. It avoids the motor wheels from getting locked-up and stops the vehicle at a faster rate rather at the same time driver holds more control of the vehicle.
There are main 4 components of the ABS system:
- Speed Sensors
Speed Sensors – ABS systems takes its input from Speed sensors and then the based on the sensed speed the next command takes places to lock up the wheels.
Valves - Acts as an interface between the master cylinder and break. the applied pressure from master cylinder passes through the valve reaches to brake.It is also responsible for releasing pressure from brake and back to main cylinder.
Pump - It plays vital role in order to push back the pressure from brake to cylinder.
Controller - It is the main CPU/computer of the ABS system that commands every components and makes the entire mechanism a complete success.
Anti-Lock Brake Types
Anti-lock braking systems use different schemes depending on the type of brakes in use. We will refer to them by the number of channels — that is, how many valves that are individually controlled — and the number of speed sensors.
Four-channel, four-sensor ABS
This is the best scheme. There is a speed sensor on all four wheels and a separate valve for all four wheels. With this setup, the controller monitors each wheel individually to make sure it is achieving maximum braking force.
Three-channel, three-sensor ABS
This scheme, commonly found on pickup trucks with four-wheel ABS, has a speed sensor and a valve for each of the front wheels, with one valve and one sensor for both rear wheels. The speed sensor for the rear wheels is located in the rear axle.
This system provides individual control of the front wheels, so they can both achieve maximum braking force. The rear wheels, however, are monitored together; they both have to start to lock up before the ABS will activate on the rear. With this system, it is possible that one of the rear wheels will lock during a stop, reducing brake effectiveness.
One-channel, one-sensor ABS
This system is commonly found on pickup trucks with rear-wheel ABS. It has one valve, which controls both rear wheels, and one speed sensor, located in the rear axle.