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. ...
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.
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?
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. Over time, they may be extended too far and unable to properly retract the brake shoes from the brake drums.
What are the types of drum brakes?
What Are The Different Types Of Drum Brakes?
- Leading-Trailing Shoe. In drum braking systems, the leading shoe is one that rotates in the direction of the drum. ...
- Twin-Leading Shoe. Twin-leading shoe braking systems feature two leading shoes that make contact with the drum. ...
- Duo-Servo
What are the two main parts of drum brakes?
Drum brakes are a brake system with brake drums (rotor) which rotate with the wheels. Inside each drum are brake shoes fitted with brake linings (friction material).
What are the main components of a drum brake system?
Drum brake components include the backing plate, brake drum, shoe, wheel cylinder, and various springs and pins.
What are the components part of the brake system?
The pads are attached to a brake caliper assembly that frames the rotor. Located on the rear of the vehicle, drum brakes feature wheel cylinders, brake shoes and a brake drum. When the brake pedal is pressed, the brake shoes are forced into the brake drum by the wheel cylinders, bringing the vehicle to a stop.
How does a drum brake system work?
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. The result of this contact produces friction which enables the vehicle to slow down or stop.
Is hydraulic piston a component of drum brake?
This is called the servo effect (self-boosting effect) which realizes the powerful braking forces of drum brakes. Structurally, it has a wheel cylinder housing a piston with which hydraulic pressure is generated to push the two shoes against the drum's inner surface.
What are the 2 types of brakes?
There are two kinds of service brakes, or the brakes that stop your vehicle while driving: disc and drum brakes.
What are the 3 main parts of the brake system?
The main parts of automobile braking systems include the pedal, drum and disc brakes, a brake booster and push rod, the master cylinder, valves and lines, and the emergency and anti-lock brakes.
Which component connects the drum brake system to the hydraulic system?
This component where the driver presses with his/her foot is called the brake pedal. It is connected to the master cylinder through a mechanical cord or linking rod. Master Cylinder: An important unit of every braking system that converts the applied force on the pedal to hydraulic pressure.
Which component connects the drum brake system to the hydraulic system?
This component where the driver presses with his/her foot is called the brake pedal. It is connected to the master cylinder through a mechanical cord or linking rod. Master Cylinder: An important unit of every braking system that converts the applied force on the pedal to hydraulic pressure.
What parts are needed for rear brakes?
The Tools Needed to Change BrakesStart With the Right Protection.Brake Pads and Rotors.Jack and Jack Stand.Lug Nut Wrench.Brake Caliper Piston Tool.Brake Bleeder Wrench.Allen Wrench Set.
What is not part of the drum brake?
Each axle of your car has a drum brake, which has about 10 pieces total, including the return spring, slack adjuster, and braking drum itself. Safety valve is a part of an air brake system, not drum brake.
What connects the drum brake system to the hydraulic system?
Brake lines- They are the hollow high pressure metal tube that connects the master cylinder with the drum cylinder inside these brake lines high pressure brake fluid from the master cylinder flows which is responsible for further brake actuation.
How many types of drum brakes are there?
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 drum brakes work?
Drum brakes slow down the car by pressing a brake shoe against the inside of the drum brake, the rotating component that spins with the wheels. The drum is made from an iron alloy that is specially formulated to be extremely long-lasting. The brake shoes consist of a friction lining bonded to a metal backing plate.
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.
How many shoes are in a brake cylinder?
The nibs rest against the support pads of the backing plate to which the shoes are installed. Each brake assembly has two shoes, a primary and secondary.
Why do drum brakes have a wedging action?
But, because of the wedging action, the shoes must be pulled away from the drum when the brakes are released. This is the reason for some of the springs. Other springs help hold the brake shoes in place and return the adjuster’s arm after it actuates.
What is brake lining?
Brake shoes fitted with brake linings (friction material) that press against the drums from the inside to generate braking force (decelerate and stop) are set inside of the drums.
What are brake shoes made of?
Brake shoes are typically made of two pieces of steel welded together. The friction material is either riveted to the lining table or attached with adhesive. The crescent-shaped piece is called the Web and contains holes and slots in different shapes for return springs, hold-down hardware, parking brake linkage, and self-adjusting components.
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.
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 the purpose of pistons in brakes?
The pistons press the brake linings, which are friction materials, against the inside surfaces of the brake drums which rotate with the wheels. The linings are pressed on the rotating drums, which in turn decelerate the wheels, thereby slowing down and stopping the vehicle. drum brake construction.
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 brake system?
A brake system is used to stop the wheels of the car and therefore stop the vehicle. All systems use hydraulic fluid to operate, and you may need to know how to bleed brakes by yourself in order to get the best performance. Brake system components won’t work properly if there is air trapped inside the system.
What is hydraulic brake system?
Each one of these systems is known as a hydraulic braking system. It means that it uses hydraulic fluid to stop the car. These are the only types of brake systems available on all cars. The chances are high that your car has rotors with calipers.
How many pads does a brake have?
Each caliper will have two pads, and they will cause friction by literally catching the rotor. When this happens, the car will slow down. Brake pads are made from a mixture of materials, including brass and many others. The goal is to cause as much friction as possible when the brake is applied.
Why do brake drums rust?
Brake drums are used alongside brake shoes. If you recall, we did mention that brake shoes will expand and cause friction with the brake drums. The name is redelivered simply due to the fact this component looks like a drum. Eventually, you will have to replace the drums. The constant friction causes them to lose material and decrease the stopping power. One of the additional drawbacks of this system is the lack of paint on the drums. They will rust over time, which doesn’t decrease their strength but has a negative impact on the look.
What is the name of the part that spins with the wheel?
Brake rotor/ Disc. Here we can see one of the main components of disc brakes. The name is derived from this part. These are massive rotors you can see through the wheel, and they spin with the car. Once the brake pedal is applied, the brake pads will press the rotor and cause it to stop.
How does a brake booster work?
The location is between the brake pedal and the master brake cylinder. The purpose is to increase the pressure of the pedal and improve stopping power. It uses a vacuum from the engine, meaning the engine must run in order to have brakes. That’s why it is never a wise idea to turn off the car while going downhill. You will literally lose your brakes. This is a dangerous situation in which you can cause an accident. Your brakes may barely work, but this depends on a car.
What is brake hose made of?
Brake hose pipe travels between the master cylinder and the slave cylinders. All cars have them, and in most cases, they are made from copper or brass. The goal is to withstand that pressure and not to corrode over time. These pipes are usually protected. They may pass through the inside of the car, and they are held in place. If this pipe breaks, you will have to replace it as soon as possible. Losing pressure and fluid means your brakes won’t work.
