automotive braking systems
DESCRIPTION
PP presentation for ED 653TRANSCRIPT
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AUTOMOTIVE BRAKING SYSTEMS
Figure 1http://www.autonest.org/wp-content/uploads/2011/08/TiresStopFeaturedImage.jpg
Donald E Maurer
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Overview
Your driving a car or truck. You press on the brake pedal, what happens?
A vehicle car goes through a process that multiplies the force you apply to the brake pedal with your foot and leg to stop the car.
This force is transmitted to the road through a series of parts using fluid pressure in most of today’s vehicles.
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Brake components and their functions
THE BRAKE PEDAL
There are two or three pedals in today’s vehicles.
The pedal in the middle, or the pedal that is immediately left of the gas pedal is the brake pedal.
The main purpose of the brake pedal is to multiply the force that is exerted by the driver to slow and stop the vehicle.
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BRAKE BOOSTER
Brake boosters are only used with power braking systems. This is standard on today’s vehicles.
The booster is used to provide more braking power while reducing the required effort from the driver.
Booster’s usually operate by using the vacuum from the vehicle engine.
Not all vehicles have this type of booster. Some provide assistance electrically.
Not all vehicles will have a booster. Some will be direct pressure from the driver.
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Brake Booster
Figure 2http://t0.gstatic.com/images?
q=tbn:ANd9GcTC93pTwXrSYaFoEjNwglWalDE8p83QqGmGhyjxN-0yZAZEB487
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MASTER CYLINDER
A master cylinder is provided to convert force from the booster into hydraulic pressure. If the vehicle does not
have a booster the pressure is converted from the brake pedal.
It is easier to transfer hydraulic pressure than mechanical pressure to the brakes.
Figure 3http://www.aa1car.com/library/brake_master_cylinder.gif
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BRAKE FLUID, LINES, AND HOSES
Fluid pressure travels from the master cylinder through the brake lines to the brakes at each wheel of the vehicle.
Brake lines are rigid except at the wheels where it is necessary to provide flexibility because of the movement of the suspension.
The rigid lines are either steel or a composite material that can withstand the corrosive environment under the vehicle.
Part of the line is steel while a short flexible material (reinforced rubber) is used to connect it to the moving parts.
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Brake fluid must withstand extreme pressure and temperature changes. It’s VERY important that the fluid:
Cannot be compressed Has a very high boiling point and flash
point Will not cause corrosion on the inside of
brake lines Can withstand extreme cold without
thickening
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Hydraulic Disk Brake Diagram
Figure 4http://upload.wikimedia.org/wikipedia/commons/thumb/7/76/
Hydraylic_disc_brake_diagram.jpg/619px-Hydraylic_disc_brake_diagram.jpg
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BRAKE CALIPERS
Fluid must be converted from hydraulic pressure to mechanical pressure.
Calipers contain a piston/s that convert hydraulic fluid pressure back to mechanical pressure.
A bigger piston or multiple pistons will produce more force. Racing or high performance applications
will use 4 or even 6 pistons in the caliper. Calipers are used with disk brake
systems.
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BRAKE PADS
Brake pads are forced against the rotor by pressure applied from the caliper.
Friction from the contact between the pad and rotor slows the speed of the rotor.
This friction produces heat.
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BRAKE ROTORS
The rotor is acted upon by the brake pads.
The friction produced is converted into torque at the wheel.
Rotors must be able to dissipate heat. Many rotors are made with cooling fins
that help to quickly dissipate heat. Rule of thumb – the bigger the rotor is, the
better it is at reducing heat, the better the stopping power of the brakes.
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Brake Rotors, Calipers, Pads
Figure 5http://t1.gstatic.com/images?q=tbn:ANd9GcRD-
YK0vb_4ZOrSo2R_vkda2J9mAFy1LdlXZLzaotm8_o6QOvvuJg
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WHEELS AND TIRES
The wheels and tires provide the contact between the vehicle and the road.
The primary function is to provide traction.
Traction works three ways: Increased acceleration. Shortened stopping distance. Increased cornering or handling.
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Wheels and Tires
Figure 6http://t3.gstatic.com/images?q=tbn:ANd9GcQE5qr5y0F-
xlR5Jew6lFRqjjj1OIIKeiL6AImSn3GXldjLlHGd
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In Summary
The brake system is designed to increase the pressure you apply to the brake pedal.
The increased pressure is applied to the calipers through hydraulics.
The calipers convert the hydraulic pressure back to mechanical force against the rotors.
The rotors apply torque to the wheels. The wheels and tires provide traction to
stop the vehicle.
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Reference Erjavec, J (2010).Automotive Technology: A Systems
Approach. Clifton Park, NY: Delmar, Cengage Learning. (p1424-1456)Inline Citation -- (Erjavec, 2010)
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Figures1. From autonest.org:
http://www.autonest.org/wp-content/uploads/2011/08/TiresStopFeaturedImage.jpg
2. From seecharanautospares.com:http://t0.gstatic.com/images?q=tbn:ANd9GcTC93pTwXrSYaFoEjNwglWalDE8p83QqGmGhyjxN-0yZAZEB487
3. From aa1car.com:http://www.aa1car.com/library/brake_master_cylinder.gif
4. From upload.wikimedia.org:http://upload.wikimedia.org/wikipedia/commons/thumb/7/76/Hydraylic_disc_brake_diagram.jpg/619px-Hydraylic_disc_brake_diagram.jpg
5. From truckinweb.com: http://t1.gstatic.com/images?q=tbn:ANd9GcRD-YK0vb_4ZOrSo2R_vkda2J9mAFy1LdlXZLzaotm8_o6QOvvuJg
6. From forums.tdiclub.comhttp://t3.gstatic.com/images?q=tbn:ANd9GcQE5qr5y0F-xlR5Jew6lFRqjjj1OIIKeiL6AImSn3GXldjLlHGd