The document describes an experiment to demonstrate an anti-lock braking system (ABS). It lists the objective as demonstrating the ABS mechanism and includes an ABS board, servo operation using vacuum, hydraulic, or compressed air assistance, ABS components like the hydraulic unit and ECU, and speed sensors. It explains that depressing the brake pedal closes the atmospheric valve in the servo cylinder, creating a vacuum that forces the piston and operates the master cylinder to send pressurized fluid to the wheel cylinders via the power pistons. Speed sensors send signals about wheel skidding to the ECU.

1. Experiment No. 8
Objective:
Demonstration of Anti Lock Braking System mechanism.
Equipment:
Fig8.1 (Anti Lock Braking System (ABS) Board)
DescriptionOf Mechanisms And Systems:
 Servo Operation
I. Vacuum Assisted Servo
II. Hydraulic Assisted Servo
III. Compressed Air Assisted Servo
 Anti Lock Braking System Components
i. Hydraulic Unit
ii. ECU
iii. Speed Electronic Sensors
iv. Wheel Brake Cylinders
 ABS Mechanism
 Need of ABS

2.  Difference Between Normal, Power Assisted and ABS
Procedure:
As the brake pedal depressed it closes the atmospheric valve in servo cylinder and suction
valve is opened. A partial vacuum is produced on the one side of the piston while
atmosphereexerts pressure on the opposite side. As pressure in the vacuum compartmentbget
lower, atmospheric pressure forces the piston along the bore of the cylinder in the direction of
vacuum port against the tension of the spring. Piston in servo compartment operate master piston
in the fluid filled master cylinder that forces the fluid through the outlet valve and pipe lines to
the power pistons which further force the pressurized fluid to wheel cylinders. Speed sensors are
available with every wheel that send the signals about wheel skidding to the engine control unit
that finally