BRAKE HANDBOOK FRED PUHN PDF

Thanks to the many brake suppliers and experts who helped with technical information and photographs. Thanks also to Carroll Smith of Carroll Smith Consulting for helpful suggestions given after reading the finished manuscript. His heroic efforts and great technical knowledge gained over the years as a Ford Motor brake-design engineer and race-car brake-design consultant made a significant contribution to the content and completeness of this book. It could not have been this quality without him.

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Thanks to the many brake suppliers and experts who helped with technical information and photographs. Thanks also to Carroll Smith of Carroll Smith Consulting for helpful suggestions given after reading the finished manuscript.

His heroic efforts and great technical knowledge gained over the years as a Ford Motor brake-design engineer and race-car brake-design consultant made a significant contribution to the content and completeness of this book. It could not have been this quality without him. Thanks Garrett. All recommendations on parts and procedures are made without any guarantees on the part of the author or HPBooks.

Because the quality of parts, materials and methods are beyond our control, author and publisher disclaim all liability incurred in connection with the use of this information. Printed in U. Many of the cars in this photo are going over 55 mph. If an emergency were to happen, the resulting chain-reaction braking would result in some drivers locking the wheels. Most of us only think about brakes when a panic stop occurs ahead in traf- fic and all we see are brakelights and the undersides of cars.

These near- emergencies illustrate how important brakes are to our safety. Brakes are also a vital part of high performance, as any racer can tell you. Because everyone wants higher per- formance and safety, brakes deserve a great deal of attention. We not only want our car to go fast, but it should also stop quickly and safely.

Any car with powerful and consistent brakes instills confidence in the driver. It also increases driving pleasure. Bad brakes are terrifying. If racing is your game, you need to know more about brakes than the problems, too. I talk about brakes as a system.

This includes fluid, lines, pedals, levers and linkages, as well as the brake units. Wheels, bodywork and even the frame structure become a part of the brake system when they affect brake performance. This book covers each part of the system and how it re- lates to overall brake performance.

It will help in the selection of compo- nents if you prefer to design a brake system. The first section of the book deals with particular parts of a brake system. The second section, starting with Chapter 9, describes how to design, install, test, maintain and modify a brake system for racing casual driver.

NO matter what type of applications. Road racing is most demanding vehicles. Introduction When driving down a long hill on a crowded freeway, a situation can occur that demands good brakes. We not only want our car to go fast , but it should also stop quickly and safely. If racing is your game, you need to know more about brakes than the casual driver. No matter what type of racing you do, brake performance is vital.

Road racing is most demanding on brakes, although drag racing and oval-track events have special I talk about brakes as a system. The second section, starting with Chapter 9, describes how to design, install, test, maintain and modify a brake system for racing applications. Race-car concepts also vehiCles. I also note where there are important differences between racing Braking is essential in winning races. These stock cars are competing on a road course-the most severe duty for automo- tive brakes.

Even though engine performance, suspension and body aerodynamics approach perfection, race cars, such as this GTP Corvette, will not be competitive without good brakes. Photo by Tom Monroe. Sounds easy, but problems start when brakes must stop a vehicle from high speed in a short distance, and do it over and over again. We expect no failures or loss of control. All brake systems should stop a vehicle. The difference between a good system and a bad one is how well it will perform under the most adverse conditions.

All vehicles have brakes, and they always did. Ever since man discovered the wheel, stopping it was a problem. Carts, wagons and carriages had brakes, usually simple blocks rubbing on a wheel. This established a basic that has yet to change, even with the most sophisticated brake system: All brakes, the friction materials rub against metal surfaces.

Different types of brakes are arranged differently, or. There are also differences in dissipating heat once it is generated. Either drum brakes or disc brakes, or a combination of the two, are used on most vehicles. These terms refer to how friction surfaces are designed and configured. The rubbing surface is a metal cylinder called a brake drum, usually made of cast iron. More modern internal drum Drum brakes are preferred on rear wheels brakes have the rubbing surface inside because a parking brake is easily adapted.

There are shoes inside the sedan. When two parts rub together, the drum with friction material attached. In This friction material is called lining.

It Basics I Good brakes are essential to overall vehicle performance. Most production sedans have drum brakes on the rear and disc brakes on the front. Drum brakes are preferred on rear wheels because a parking brake is easily adapted. This large drum is on the rear of a 2-ton sedan.

Brake systems are designed to do one thing-stop the vehicle. Ever since man discovered the wheel , stopping it was a problem. This established a basic that has yet to change, even with the most sophisticated brake system: All brakes use friction to stop the vehicle. In brakes, the friction materials rub against metal surfaces.

Different types of brakes are arranged differently, or use different methods of forcing rub- bing surfaces together. Early drum brakes were exter- nal-rubbing surface was outside of the drum. More modern internal drum brakes have the rubbing surface inside the drum. There are shoes inside the drum with frict ion material attached. This friction material is called lining. It I I Honda disc brake is typical of front brakes used on small sedans. Exposed rubbing surface of disc brake aids cooling.

The shoes are forced against the inside surface of the drum when the driver pushes the brake pedal, creating friction between the lining and the drum surface. Drum brakes are covered in Chapter 2.

Disc Brakes-A modern brake design is the disc brake. The drum is replaced by a flat metal disc, or rotot; with a rubbing surface on each side. The rotor is usually made of cast iron. Friction materials are inside a caliper, which surrounds the rotor. Disc-brake friction material-one on each side of the rotor-is called a brake pad, puck or lining. This caliper is designed to clamp the pads against the sides of the rotor to create friction. Disc brakes are covered in Chapter 3.

I call this the actuating system. This system can be mechani- cal, hydraulic, pneumatic or a combi- nation of these. Future vehicles could use electric systems. Whatever the type of actuating system, the result is the same: When the driver operates the system, brakes are applied. Because friction material sur- rounds the outside of the drum, little cool- ing air contacts the hot rubbing surface.

External drum brakes are simple and easy to service, but have horrible cooling ability. Prewar MG used mechanical brakes. Front brakes are operated by cables that flex as the wheels steer and move up and down. Finned aluminum drums give better cooling than plain cast iron.

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Brake Handbook Fred Puhn

Dolrajas Sourav rated it it was amazing May 11, The purpose of a tandem master cylinder is to protect against total loss of brakes when failure occurs. Note the metal pushrod be- tween the primary and secondary pistons. This allows trapped fluid between pistons to be pressurized by primary piston, actuating front brakes. These 5 locations in Victoria: Open to the public Book; Illustrated English Show 0 more libraries Feed Saurav rated it really liked it Jan 07, Force If leak develops in front-brake system, primary piston moves for- ward until it bottoms against secondary piston. Open Preview See a Problem? Brake Handbook — Fred Puhn — Google Books When a leak occurs in the rear system, fluid is trapped between the primary and secondary pistons, with fluid leakage behind the secondary piston.

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Brake handbook

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