Vehicle Brake Basics
Brakes are mechanical devices used to slow or stop a moving object, or to prevent the movement of a stationary object. This course discusses the hydraulic braking systems typically installed in modern automobiles and light duty trucks. Similar systems can be used on rotating equipment and machinery. Brake pedal design, vacuum-assisted brake boosters, “master” and “slave” cylinders, emergency brakes, anti-lock brake systems, and the importance of regular inspections and maintenance are all covered.





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Course Details
Learning Objectives
• Define “friction,” “force,” “hydraulics” and “pressure” • Discuss how “leverage” and the “pedal ratio” increase braking force • Discuss how “brake assist” or “power brakes” increase braking force • Identify and describe disc brakes and drum brakes in vehicle brake systems • List important characteristics for brake fluids • List the brake system components which should be regularly inspected • Describe the functions of emergency brakes, anti-lock brake systems, and wear indicators on brake linings
Specs
Frequently Asked Questions
How does the brake pedal design affect a vehicle’s braking system performance?
Why does the “master cylinder” have two separate pistons?
What is a “brake booster”?
What is a “slave cylinder”?
How do ABS brake systems determine that a wheel is slipping?
Sample Video Transcript
The most common disc brake design consists of a disc rotor that is attached to the wheel, a U-shaped caliper with a single piston, and two replaceable brake pads. This “single-piston floating caliper” disc brake functions much like the brakes on a bicycle, except the brake pads press against a rotor instead of a wheel. As the brake fluid is pressurized by the piston movement in the master cylinder, the piston in the caliper moves the brake pads toward the rotor. Friction between the brake pads and the rotor slows the wheel from turning. Because friction generates heat, most car disc brakes are “vented” by a set of vanes that pump cooling air through the brake. Virtually all modern cars have disc brakes on the two front wheels because disc brakes tend to be more efficient and braking throws a car’s weight forward on to the front wheels. It is increasingly common to have disc brakes on all four wheels.