what are the two main components of the drum brake system

by Dr. Carmela Gibson Published 3 years ago Updated 2 years ago

^{DRUM BRAKE COMPONENTS}

Backing plate: Provides a solid base for other components in the drum brake attached to the axle sleeve.
Brake drum: Bolted to the wheel hub and spins with the wheel. Often made of cast iron, and is resistant to heat and wear. ...
Wheel cylinder: Contains two pistons, one at each end of the cylinder, to operate the brake shoes. ...
Brake shoe: Pushes into the drum to create the friction necessary to slow or stop the car. ...
Automatic adjuster: Keeps the brake shoes at a consistent distance away from the drum, even as the lining wears away.
Return springs: Pulls the brake shoes back away from the drum when the driver lets off the brake pedal. ...

Brake shoes and pads are also components that are often found in a drum brake. A brake shoe or brake pad is used to put the brake on a drum brake system. While the area to put the brake pads in the disc brake components is the brake pad.Mar 31, 2021

Full Answer

What are drum brakes and how do they work?

Although this was an improvement on its wood block predecessor, manufacturers soon found that drum brakes were affected by temperature and incursions by dust, snow and water. The solution was to place the brake pads inside a drum where they were more ...

What are the parts of a brake drum?

It contains:

Brake pads: metal plates bonded with material that provides stopping friction.
One or two pistons to push the brake pads against the rotor when you brake.
A bleeder screw to allow for servicing the brakes and replacing the fluid.
A rubber piston seal that prevents brake fluid leakage and retracts the piston when the brakes release.

More items...

Do drum brakes work better than disk brakes?

One of the main advantages of drum brakes is that they provide a larger contact patch between the brake shoes and the drums which allows drum brakes to provide more braking force than equivalent disc brakes.

What is included in a drum brake hardware kit?

Touch device users, explore by touch or with swipe gestures. A drum brake hardware kit includes all of the springs and clips that should be replaced when servicing drum brakes. Each time a vehicle brakes, these springs are stretched slightly.

What is Drum Brake?

A drum brake is a brake that uses friction caused by a set of shoes or pads that press outward against a rotating cylinder-shaped part called a brake drum.

Diagram of Drum Brakes

Drum brakes are a brake system with brake drums (rotor) that rotate with the wheels. Inside each drum are brake shoes fitted with brake linings (friction material). Pistons (pressure mechanism) press against the drums from the inside to generate braking force, thus making it possible to decelerate and stop the vehicle.

Drum Brakes Parts

Drum brake components include the backing plate, brake drum, shoe, wheel cylinder, and various springs and pins.

How Do Drum Brakes Work?

A drum brake system consists of hydraulic wheel cylinders, brake shoes, and a brake drum. When the brake pedal is applied the two curved brake shoes, which have a friction material lining, are forced by hydraulic wheel cylinders against the inner surface of a rotating brake drum.

Types of Drum Brakes

There are three types of drum brakes depending on how the brake shoes are pressed onto the drums; leading/trailing shoe type, twin leading shoe type, and duo-servo type.

How Do I Know if it is Time to Replace Brake Shoes?

You can do a visual inspection of the friction material on your brake shoes through the rivet holes in the shoe body. If the shoes are not at least 2 or 3 millimeters thick, they should be replaced.

Drum brake disadvantages

Their components require a break-in period. Unlike disc brake pads, brake shoes require a longer break-in period. Therefore, when replacing these components, it is advisable to avoid sudden braking during the first 300 kilometers. In addition, it is also not advisable to carry out an MOT brake test, since braking is not as effective.

What is a drum brake?

The term “drum brake” usually means a brake in which shoes press on the inner surface of the drum. When shoes press on the outside of the drum, it is usually called a clasp brake. Where the drum is pinched between two shoes, similar to a conventional disc brake, it is sometimes called a “pinch drum brake”, although such brakes are relatively rare.

What is the purpose of drum brakes?

Drum brakes allow simple incorporation of a parking brake.

What are the disadvantages of drum brakes?

Disadvantages of Drum Brake: When the drums are heated by hard braking, the diameter of the drum increases slightly due to thermal expansion, this means the brakes shoes have to move farther and the brake pedal has to be depressed further. The properties of the friction material can change if heated, resulting in less friction.

What are the tabs on the edge of a wheel cylinder called?

The edge of the lining table generally has three “V”-shaped notches or tabs on each side called nibs . The nibs rest against the support pads of the backing plate to which the shoes are installed.

How do pistons work on brakes?

Two pistons operate the shoes, one at each end of the wheel cylinder. When hydraulic pressure from the master cylinder acts upon the piston cup, the pistons are pushed toward the shoes, forcing them against the drum. When the brakes are not being applied, the piston is returned to its original position by the force of the brake shoe return springs.

What is the term for a flexible belt that wraps around the outside of a drum called?

A related type of brake uses a flexible belt or “band” wrapping around the outside of a drum, called a band brake. Drum brake Working Mechanism.

Where are the nibs on brakes?

Each brake assembly has two shoes, a primary and secondary. The primary shoe is located toward the front of the vehicle and has the lining positioned differently than the secondary shoe.

Drum Brake Components

Besides brake shoes (brake shoe) and drum itself, there are still some main components of drum brake, which are as follows:

Drum Brake Parts In Detail

The four components above are drum brake components in outline, in addition to the four components above there are drum brake components in more detail, as follows:

What is a drum brake?

A drum brake is a brake that uses friction caused by a set of shoes or pads that press outward against a rotating cylinder-shaped part called a brake drum. The term drum brake usually means a braking system in which shoes press on the inner surface of the drum.

What is hydraulic drum brake?

The hydraulic Drum brake system such as in cars is a bit superior to a mechanical one. In this design, the hydraulic wheel cylinder replaces the cam. In the hydraulic system, instead of a cam, the wheel cylinder’s pistons push the brake shoes outwards. The brake shoes fit on the anchor plate or braking plate.

What are the disadvantages of a brake shoe lining made of asbestos?

1. Low braking force compared to Discs#N#2. Brakes ‘fade’ when applied for a prolonged time#N#3. The brake shoe lining made of asbestos is harmful to humans#N#4. When wet, the braking grip reduces considerably#N#5. Non-asbestos linings catch moisture, causing Drum brakes to grab suddenly.

How does hydraulic brake work?

In the hydraulic system, instead of a cam, the wheel cylinder’s pistons push the brake shoes outwards. The brake shoes fit on the anchor plate or braking plate. It holds the brakes system parts together and on to the car’s axle. When you press the brake pedal, the oil in the brake master cylinder multiplies the hydraulic force sent to the wheel cylinders. Thus, it causes its pistons to push outwards. The pistons, in turn, cause the brake shoes to expand and rub against the drum. The friction between the brake linings and the drum causes the drum to stop rotating, thereby the wheel to stop.

How do brake shoes work on a two wheeler?

When you press the brake pedal, the cam turns. Thus, it causes the brake shoes to expand outwards and rub against the drum.

How does hydraulic pressure work on a brake pedal?

When the driver steps on the brake pedal, the power is amplified by the brake booster (servo system) and changed into hydraulic pressure (oil-pressure) by the master cylinder. The pressure reaches the brakes on the wheels via tubing filled with brake oil (brake fluid).

Why does the brake pedal stop rotating?

The friction between the brake linings and the drum causes the drum to stop rotating, thereby the wheel to stop. When you release the brake pedal, the retracting springs bring the brake shoes back to their original position. This results in a gap between them and the drum and to again spin it freely. 2. Hydraulic:

What is a drum brake?

The drum brake is a component that has a significant role in the drum brake work system. This component is made of cast steel, so the texture is tough, and the shape resembles a drum or tube.

What is a parking brake lever?

The parking brake lever is one of the drum brake components that can only be found in cars because it will not be used in motorbikes. With the parking brake lever, the drum brake construction will look more complicated. Two levers can be found in the parking brake lever system, namely the park brake lever and the brake shoe link.

What is a brake shoe?

Brake shoes and pads are also components that are often found in a drum brake. A brake shoe or brake pad is used to put the brake on a drum brake system. While the area to put the brake pads in the disc brake components is the brake pad.

What is a wheel cylinder?

Wheel cylinders become drum brake components that are useful for converting the fluid pressure into mechanical motion. In general, several types of wheel cylinders are usually found or used in drum brake systems.

What is a backing plate?

The backing plate is one of the drum brake components in the form of a metal-based band which is relatively thin and is placed on the back of the drum brake system. This component serves as a protection for other drum brake components.

What is the third type of brake system?

Furthermore, the third type is the pneumatic-assisted brake system. It is actuated by air-pressure which works on the same principle of that of the mechanical brake system. It also consists of a bigger size cam or the ‘S’ shaped cam. Another name for this brake is the “ S-Cam ” brake system.

What brake system is used on a scooter?

Drum Brake Working Principle: Two-wheelers such as scooters, commuter bikes, three-wheelers including auto-rickshaws widely use the Drum Brake system for braking. This type of brake system is used on the rear wheels of most hatchback cars, entry-level sedans & MUVs.

Why do brake shoes rub against the drum?

Thus, it causes the brake shoes to expand outwards and rub against the drum. The friction between the brake linings and the drum causes the drum to stop rotating; thereby stopping the wheel. When you release the brake pedal, the retracting springs bring the brake shoes back to their original position.

How do brake shoes work on a two wheeler?

Mechanical: In the mechanical system such as in two-wheeler & an auto-rickshaw, the brake shoes are actuated by a cam, which is attached to the brake linkage & pedal. When you press the brake pedal, the cam turns. Thus, it causes the brake shoes to expand outwards and rub against the drum.

What is hydraulic brake?

Hydraulic: The hydraulic brake system such as in cars is a bit superior to the mechanical one. In this design, the hydraulic wheel cylinder replaces the cam. In the hydraulic system, instead of a cam, the wheel cylinder’s pistons push the brake shoes outwards. The brake shoes fit on the anchor plate or braking plate.

What is the purpose of brake shoes?

The brake shoes fit on the anchor plate or braking plate. It holds the brakes system parts together and on to the car’s axle. When you press the brake pedal, the oil in the brake master cylinder multiplies the hydraulic force sent to the wheel cylinders. Thus, it causes its pistons to push outwards. The pistons, in turn, cause the brake shoes ...

Why do brakes fade?

Brakes 'fade' when the driver applies them for a prolonged time. The brake shoe lining made of asbestos is harmful to humans. When wet, the braking grip reduces considerably. Non-asbestos linings catch moisture; causing the brakes to grab suddenly.

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