brake 1.pdf - Brake Fundamentals Objectives \u2022 Explain the basic principles of braking including friction pressure and heat dissipation \u2022 Describe

brake 1.pdf - Brake Fundamentals Objectives u2022 Explain...

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Brake Fundamentals
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Objectives Explain the basic principles of braking, including friction, pressure, and heat dissipation Describe hydraulic system operation, including master cylinder, control valves, and safety switches Understand the operation of power brakes
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Introduction Kinetic energy: energy that wants to stay in motion Apply brakes to stop a car: dry friction changes motion energy to heat energy Temperature in brake linings can be 600°F Friction resists movement between surfaces Coefficient of friction varies Temperature, rubbing speed, surface condition During a stop Vehicle weight shifts to front brakes Front breaks wear out faster
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Brake Linings Linings are bonded or riveted to disc backing Newer pads integrally molded Lining types Asbestos linings: health hazard Semimetallic linings: sponge iron and steel fibers Metallic linings: used in heavy-duty and racing conditions Ceramic linings: use ceramic and copper fibers to control heat
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Drum and Disc Brakes Drum brake systems Metal brake drums bolted to wheels Disc brake systems Rotor and caliper, similar to bicycle
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Hydraulic Brake System Operation Brake pedal depression Moves piston in master cylinder Fluid under pressure is pushed to slave cylinder Slave cylinders are located at each wheel Pascal’s Law: Pressure in an enclosed system is equal and undiminished in all directions Force = Pressure x Area Force applied to brake linings increases with larger diameter wheel cylinder
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Hydraulic Brake Fluid Glycol-based fluids are hygroscopic Absorb water Brake fluid Higher boiling point than water DOT specifications List both dry and wet boiling points
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Brake Hose and Tubing
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  • Spring '16
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