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Vehicle Braking System Basics

Braking systems use friction to convert kinetic energy into heat. In drum brakes, wheel cylinders force brake linings against the inner drum, while in disc brakes, pads are forced against a disc. A basic hydraulic braking system has brake assemblies at the wheels and a hydraulic system to apply them, using a master cylinder, brake lines, and fluid to transmit pressure and stop the wheels when the brake pedal is pressed.

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139 views2 pages

Vehicle Braking System Basics

Braking systems use friction to convert kinetic energy into heat. In drum brakes, wheel cylinders force brake linings against the inner drum, while in disc brakes, pads are forced against a disc. A basic hydraulic braking system has brake assemblies at the wheels and a hydraulic system to apply them, using a master cylinder, brake lines, and fluid to transmit pressure and stop the wheels when the brake pedal is pressed.

Uploaded by

Lê Văn Hoạt
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Principles of braking

Summary
Friction between braking surfaces converts kinetic energy into heat. In drum brakes, wheel
cylinders force brake linings against the inside of the drum. In disc brakes, pads are forced
against a brake disc.

Several factors can influence vehicle braking:

 Road surface
 Road conditions
 Weight of the vehicle
 Load on the wheel during stopping
 How the vehicle is being driven
 The tires on the vehicle.

An effective braking system takes all these factors into account.

A basic hydraulic braking system has 2 main sections -

 the brake assemblies at the wheels, and


 the hydraulic system that applies them.

There is a brake for:

 when the vehicle is in motion – usually a foot brake – for slowing or stopping the vehicle
 a park brake for when it’s stationary – usually operated by hand but sometimes foot
activated

Some systems have all drum brakes. Some have disc brakes on the front wheels and drum brakes
on the rear, others have all disc brakes.
A basic braking system has a:

 brake pedal,
 master cylinder to provide hydraulic pressure,
 brake lines and hoses to connect the master cylinder to the brake assemblies,
 fluid to transmit force from the master cylinder to the wheel cylinders of the brake
assemblies; and
 brake assemblies – drum or disc – that stop the wheels.

The driver pushes the brake pedal; it applies mechanical force to the piston in the master
cylinder. The piston applies hydraulic pressure to the fluid in the cylinder, the lines transfer the
pressure – which is undiminished in all directions within the confines of the brake lines – to the
wheel cylinders, and the wheel cylinders at the wheel assemblies apply the brakes.

Force is transmitted through the fluid. For cylinders the same size, the force transmitted from one
is the same value as the force applied to the other. By using cylinders of different sizes, forces
can be increased or reduced.

In an actual braking system, the master cylinder is smaller than the wheel cylinders, so the force
at all of the wheel cylinders is increased.

When brakes are applied to a moving vehicle, they absorb the vehicle’s kinetic energy. Friction
between the braking surfaces converts this energy into heat.

In drum brakes, the wheel cylinders force brake linings against the inside of the brake drum. In
disc brakes, pads are forced against a brake disc. In both systems, heat spreads into other parts
and the atmosphere, so brake linings and drums, pads and discs must withstand high
temperatures and high pressures.

On modern vehicles this basic system has some refinements, such as a power booster. This helps
the driver apply the brakes.

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