The brake pedal the power brake booster the master cylinder the hydraulic control valve the hydraulic lines the front disc brakes. Because of the work involved, be prepared to do a complete brake job, if necessary, when you pull the rear drums. Sumit thakur mechanical disc brake seminar and ppt with pdf report. Recently the clubs managers have become aware of a number of incidents including one that involved a fatality, resulting from mooring line failure where it appears the cause was not attributable to poor condition of equipment but rather the incorrect usage of the mooring winches. On some cars of yesteryear at least, slamming on the brakes while backing up tightens the shoes against the drums. Drum brakes are sometimes found on the rear wheels of entrylevel cars for cost savings, and in classic cars. The wheel hub and brake assembly components should be. Drum brakes usually need to be adjusted when the brake pedal has to be pressed down a lot before the brakes engage. This page contains disc brake seminar and ppt with pdf report. Drum brakes are less expensive to make than disc brakes, largely because they can also double as a parking brake, whereas disc brakes require a separate parking brake mechanism. Working the drum brake stops the tire from rotating by using the hydraulic pressure transmitted from the master cylinder to the wheel cylinder to press the brake shoe against that brake drum, which is rotating together with the tire.
You must understand all procedures and instructions before you begin to work on a unit. By fitting disc brakes to the front wheels and drum brakes to the rear wheels, manufacturers can provide most of the benefits of disc brakes while lowering costs. To confirm your brakes are in good working order before you adjust them, check your vehicle for symptoms of a bad. They are not affected by wet conditions and they require less maintenance. Pdf the braking performance has become a very important factor for. Brake system diagram tapered wear a gradual slope of the pad material creating uneven thickness on either end of the pad. This is because water takes longer time to come out from the drum. The shoes return to a fully retracted or rest position when the pressure to the wheel cylinder is released. Many cars have drum brakes on the rear wheels and disc brakes on the front figure 24. It should not be used with any custom built, oneofakind brakes because such combinations have not been tested and evaluated. However, they are heavier than rim brakes and disc brakes, and until they are used a bit their braking power is not as strong. With all of the brake components connected into the system, the brake will operate as. Some procedures require the use of special tools for safe and correct.
The fulcrum is at the top of the pedal arm, the input is at the opposite end, and the output is somewhere in between. Electric brakes the electric brakes on your trailer are similar to the drum brakes. This output force becomes the input force for the power brake unit or booster. You will find a combination valve on most cars with front disc brakes and rear drum brakes figure.
Hydraulic brakes mechanical brakes dlh dcm dsh dlm dh dm fsh h hydraulic and mechanical drum brakes maintenance manual no. Brake pedal brake drum master cylinder brake pads brake caliper brake line rotor piston seal outer pad assembly. By the way on drum brakes the shoe with less material to contact the drum is the primary shoe and the shoe with more llining is the secondary shoe. Working of drum brakes drum brakes work on the same principle as the disc brakes. T h es toc k d rumb ap i nl f than the disc brake spindle, so even a gm disc brake bracket will not work on the drum brake spindle. Introduction a drum brake is a brake in which the friction is caused by a set of shoes or pads that press against a rotating drum shaped part called a brake drum. Convert oldschool drum brakes with a disc brake conversion kit. And because front brakes do most of the work when stopping, automakers ultimately switched to power front disc brakes. Today there are primarily two brake systems, abs and non abs systems anti brake skid one system is basic hydraulics that work with a master brake cylinder which is connected to the brake peddle in the car.
Disc brake seminar ppt with pdf report brake basics leverage hydraulics friction why. Also explore the seminar topics paper on disk brake with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year mechanical engineering me or production automobile students for the year 2019 2020. The solution should be applied with low pressure to prevent dust from becoming airborne. The friction between the brake linings and the drum causes the drum to stop rotating. How a brake system works brake systems were designed to slow the vehicles wheel movement through friction. Ok, so we agree drum brakes arent the most effective type of brakes. Disc brakes work using the same basic principle as the brakes on a bicycle. Drum brakes retain heat and are more complex than disc brakes but are often the more economical and powerful brake type to use in rear brake applications due to the low heat generation of rear brakes, a drum brake s selfapplying nature, larger friction surface contact area, and long life wear characteristics %life usedkw of braking power. A lot of cars even these days have disc brakes on the front, and drum brakes on the back. Air from the atmosphere supplies both the truck engine and the compressor. When working on brake systems of older cars, care must be taken not to inhale any dust. The disadvantages of drum brakes include mechanical brake fade as the drum expands from heat.
State the purpose of this mechanism, complete the labelling on the drawing and describe the operation of this brake. Air brakes are used on heavy vehicles because they have proven. The cylinder pushes the shoes into the drum to slow or stop your car. Keep in mind that not all drum brakes are adjustable.
Pdf analysis of drum brake system for improvement of braking. When it comes to driving safety, nothing is more critical than your tires and brakes. Electric brakes the electric brakes on your trailer are similar to the drum brakes on your automobile. In this article we have learnt about how drum brakes works and its main parts, working principle with advantages and disadvantages.
For example, a driver input force of 100 n is multiplied by a 4. The actuator is designed for use with one or two sets of either 10 or 7 drum breaks. How drum brakes work car drum brake systems include the drum, brake shoes, and wheel cylinder. Because of this advantage, vehicles with fourwheel drum brakes do not require a powerassisted brake system like those using disc brakes do. Twowheelers such as scooters, commuter bikes, threewheelers including autorickshaws widely use drum brake system for braking. A drum brake is a brake in which the friction is caused by a set of shoes or pads that press against the inner surface of a rotating drum.
Nothing at all wrong with a 4 wheel drum brake set up with non power assist,its not the best set up but nothing wrong with it when working properly. Explore disk brake with free download of seminar report and ppt in pdf and doc format. Drum brake also has an adjuster mechanism, an emergency brake mechanism and lots of springs. How to maximize drum brakes mustang monthly magazine. The importance of drum brake self adjusters know your parts. Disk brake seminar report, ppt, pdf for mechanical. If it was the back brakes that were squeaking, the backup idea possibly might help. To check for brake problems, you step on the pedal and press it down while paying attention to how the pedal feels under your foot and evaluating the sensation. Mechanical braking system mechanical and automobile ieee project topics, thermal engineering base paper ideas, synopsis, abstract, report, figures, full pdf, working details for mechanical engineering me, diploma, btech, be, mtech and msc college students. Complete guide to disc brakes and drum brakes les schwab.
The actuator is to be used only with brakes specifically designed for trailer service. The brake drum, attached to the rotating wheel, acts as a cover for the shoe and operating mechanism and furnishes a frictional surface for the brake shoes. After installation of brake assembly without side arm at normal location, install the side arm back in original position following the disassembly steps in the reverse order. Drum brakes work with a cable which is attached to the lever on the handle bars. Provides a solid base for other components in the drum brake. The shoes are pulled away from the drum by the springs when the brakes are released. Gritt 14 1062002 14 typical power disc drum system here is an overview of a typical passenger car brake system. Construction, working and maintenance of electro hydraulic. As a result, brake lining mounted on the brake shoe comes into contact with brake drum and friction is produced. Mechanical braking system mechanical project topics.
History the modern automobile drum brake was invented in 1902 by louis renault, though a lesssophisticated drum brake had been used by maybach a year earlier. The brake drum braking system closes inside it the whole mechanism to protect it from dust and first. With this kit all you will need is the brake fluid and few hours of your time. Disc brakes are a brake system that slowly a wheels rotation by force an attached element disk in a viselike hydraulic caliper. Allow the solution to flow between the brake drum and the brake support or the brake rotor and caliper. Often made of cast iron, and is resistant to heat and wear. With all of the brake components connected into the system, the brake should. Drum brakes have more parts than disc brakes and are harder to service, but they are less. When the brake pedal or lever is pressed, the toggle levercam turns which forces the brake shoe to move away and consequently it makes surface contact with the brake drum. The finite element analysis of the cast iron and mmc brake drum has been also presented in this. In this article we will learn about how drum brakes work. In principle, drum brakes operate pretty much like disc brakes except that the movement of the brake shoes is outwards from the midline to allow them to get in contact with the brake drum.
Drum brakes have return springs to return the shoes to a rest position and hardware to hold the shoes to the backing plate. Drum brakes consist of a heavy flattopped cylinder, which is sandwiched between the wheel rim and the wheel hub see figure 2. In the present work, the substring lengths of all variables. The basic difference is that your automotive brakes are actuated by hydraulic pressure while your electric trailer brakes are actuated by an electromagnet.
The extra braking force provided by the wedging action allows drum brakes to use a smaller piston than disc brakes. The brake shoes and brake operating mechanism are supported on a backing plate or brake shield attached to the vehicle axle, as shown in figure 340. It isnt that it is an off topic car but its nice for those of us who are attempting to help sort things via the web to know exactly what someone is working on. Its main parts, principle and working with advantages and disadvantages. Drum brakes work on the same principle as disc brakes. A drum brake is a brake that uses friction caused by a set of shoes or pads that press outward. Here, we discuss updating your classic with drum todisc conversion kits for both front and rear ends. Disc brake seminar ppt with pdf report study mafia. Heres a guide to the two types of passengervehicle brakes, disc and drum. When working on a brake system, always keep in mind that a brake system failure could result in a fatal vehicle accident.
Drum brakes are less expensive than disc brakes and they are somehow a. Click on the title on this page to go to the maintenance manual index. When you release the brake pedal, the retracting springs bring the brake shoes back to their original position. Fixing drum brakes by backing up maintenancerepairs. We explain how they work, how theyre different and alike, why you may have both types on the same vehicle, what kind of wear to. Start your engine, but keep it in park with the parking brake on. Figure 5 shows that as the brake shoes contact the drum, there is a kind of wedging action, which has the effect of pressing the shoes into the drum with more force. Many cars have drum brakes on the rear wheels and disc brakes on the front.
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