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...

Products & Services
Electric Brakes
Electric brakes are assemblies consisting of electrical elements for the slowing or stopping of shafts in equipment drives. Electrical power is required to activate the brake.
Mechanical Brakes
Mechanical brakes convert kinetic energy to other energy forms, primarily heat. They decelerate shafts and linked components via friction between a rotating body and wear-resistant material.
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.
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.
Hydraulic Brake and Clutch Assemblies
Hydraulic brake and clutch assemblies consists of elements for both the connection and disconnection of shafts (clutch) and for the slowing or stopping of shafts (brake) in equipment drives.

Topics of Interest

The steering mechanism has two main purposes. It must enable the driver to: easily maintain the straight ahead direction of the vehicle even when bumps are encountered at high speeds; and to change...

8.1 Brakes 8.1.1 Introduction The main braking system of a car works by hydraulics. This means that when the driver presses the brake pedal, liquid pressure forces pistons to apply brakes on each...

Jerry L. Cage Komatsu Mining Systems, Inc. 15.1 Introduction This chapter describes braking by first examining vehicle braking fundamentals, including the tire-to-road interface, vehicle dynamics,...

10.1 ABS Control Systems The ABS system aims at minimizing the braking distance while retaining steerability during braking. The shortest braking distance can be reached when the wheels operate at...

The brake system on each of the energy absorbers consists of two Dellner Brakes type SKD 4x75 hydraulically applied disc brakes working on a 1400 mm (55.1 in) diameter brake disc. The arrester system...

Product Announcements
Hilliard Corporation (The)
Hilliard Corporation (The)
Dellner Brakes AB