© 2011 Pearson Education, Inc. All Rights Reserved Automotive Technology, Fifth Edition James Halderman BRAKING SYSTEM PRINCIPLES 93.

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© 2011 Pearson Education, Inc. All Rights Reserved Automotive Technology, Fifth Edition James Halderman BRAKING SYSTEM PRINCIPLES 93

BRAKING SYSTEM PRINCIPLES Automotive Technology, Fifth Edition James Halderman © 2011 Pearson Education, Inc. All Rights Reserved Figure 93-1 Energy which is the ability to perform work exists in many forms.

93 BRAKING SYSTEM PRINCIPLES Automotive Technology, Fifth Edition James Halderman © 2011 Pearson Education, Inc. All Rights Reserved Figure 93-2 Kinetic energy increases in direct proportion to the weight of the vehicle.

93 BRAKING SYSTEM PRINCIPLES Automotive Technology, Fifth Edition James Halderman © 2011 Pearson Education, Inc. All Rights Reserved Figure 93-3 Kinetic energy increases as the square of any increase in vehicle speed.

93 BRAKING SYSTEM PRINCIPLES Automotive Technology, Fifth Edition James Halderman © 2011 Pearson Education, Inc. All Rights Reserved Figure 93-4 Inertia creates weight transfer that requires the front brakes to provide most of the braking force.

93 BRAKING SYSTEM PRINCIPLES Automotive Technology, Fifth Edition James Halderman © 2011 Pearson Education, Inc. All Rights Reserved Figure 93-5 Front wheel drive vehicles have most of their weight over the front wheels.

93 BRAKING SYSTEM PRINCIPLES Automotive Technology, Fifth Edition James Halderman © 2011 Pearson Education, Inc. All Rights Reserved TECH TIP: Brakes Cannot Overcome the Laws of Physics No vehicle can stop on a dime. The energy required to slow or stop a vehicle must be absorbed by the braking system. All drivers should be aware of this fact and drive at a reasonable speed for the road and traffic conditions.

93 BRAKING SYSTEM PRINCIPLES Automotive Technology, Fifth Edition James Halderman © 2011 Pearson Education, Inc. All Rights Reserved Figure 93-6 A brake pedal assembly is a second-class lever design that provides a 5 to 1 mechanical advantage.

93 BRAKING SYSTEM PRINCIPLES Automotive Technology, Fifth Edition James Halderman © 2011 Pearson Education, Inc. All Rights Reserved Figure 93-7 The coefficient of friction in this example is 0.5.

93 BRAKING SYSTEM PRINCIPLES Automotive Technology, Fifth Edition James Halderman © 2011 Pearson Education, Inc. All Rights Reserved Figure 93-8 The type of friction material affects the coefficient of friction which is just 0.05 in this example.

93 BRAKING SYSTEM PRINCIPLES Automotive Technology, Fifth Edition James Halderman © 2011 Pearson Education, Inc. All Rights Reserved Figure 93-9 The static coefficient of friction of an object at rest is higher than the kinetic (dynamic) friction coefficient once in motion.

93 BRAKING SYSTEM PRINCIPLES Automotive Technology, Fifth Edition James Halderman © 2011 Pearson Education, Inc. All Rights Reserved CHART 93–1 The static coefficient of friction of an object at rest is higher than the kinetic (dynamic) friction coefficient once in motion.