BOOK_CONTENT
From A Practical Approach to Motor Vehicle Engineering and Maintenance, Second Edition

7.1 Vehicle braking systems

The purpose of the braking system is to slow down or stop the vehicle and, when the vehicle is stationary, to hold the vehicle in the chosen position. When a vehicle is moving it contains energy of motion (kinetic energy) and the function of the braking system is to convert this kinetic energy into heat energy. It does so through the friction at the brake linings and the brake drum, or the brake pads and the disc.

Some large vehicles are fitted with secondary braking systems that are known as retarders. Examples of retarders are exhaust brakes and electric brakes. In all cases, the factor that ultimately determines how much braking can be applied is the grip of the tyres on the driving surface.

7.2 Types of brakes

Two basic types of friction brakes are in common use on vehicles; these are:

  1. the drum brake

  2. the disc brake

The drum brake

Figure 7.1 shows a drum brake as used on a large vehicle. This cut-away view shows that the linings on the shoes are pressed into contact with the inside of the drum by the action of the cam. In this case the cam is partially rotated by the action of a compressed air cylinder. The road wheel is attached to the brake drum by means of the wheel studs and nuts.


Figure 7.1: A cam operated drum brake

A brake of this type has a leading shoe and a trailing shoe. The leading shoe is...

Copyright Derek Newbold and Allan Bonnick 2005 under license agreement with Books24x7

Products & Services
Linear Brakes
Linear brakes are used to slow or stop linear motion in conveyors, web systems, and vehicles.  Technologies include friction, eddy current braking, and hysteresis.
Wheel and Track Drives
Wheel and track drives are a gearbox, motor and brake assembly which power wheeled or tracked vehicles. Motors can be either electric or hydraulically powered.
Hydraulic Brakes
Hydraulic brakes use a fluid to transfer pressure and actuate the braking mechanism.
Pneumatic Brakes
Pneumatic brakes are assemblies consisting of elements for the slowing or stopping of shafts in equipment drives. Air is required to activate the brake.

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