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drum brakes: Type of braking system that uses a drum-shaped (cylinder) housing that is
directly connected to the wheel. When a driver steps on the brake pedal, curved brake
shoes inside the drum press against the drum, creating friction to slow or stop motion of
the wheel.
friction: The measure of difficulty to slide one object over another. The method used to
slow the speed of a vehicle using resistance of one object that is moved in contact with
another; methods include pressing brake pads against a brake disc or drum, and a moving
vehicle’s tires contacting the road.
glazing: A term that refers to a brake lining that has become smooth and glossy due to
overheating.
hydraulic pressure: Method used to slow the speed of a vehicle using the pressure of
fluid for power.
leverage: Method used to slow the speed of a vehicle by multiplying the mechanical pressure, or force from the operator’s foot on the brake pedal, several times before passing it
on to the hydraulic system.
master brake cylinder: Primary brake system component that holds brake fluid and sends
hydraulic pressure to each wheel through brake lines each time the operator depresses
the brake pedal; primary component for pressurizing fluid in a hydraulic system.
power-assisted brakes (power brakes): Type of braking system, often vacuum-assisted,
that lessens the amount of force an operator has to apply to the brake pedal.
slave cylinder (wheel cylinder): Cylinders in which movable pistons convert hydraulic
brake fluid pressure into mechanical force, causing hydraulic pressure against the piston(s)
within the wheel cylinder to force the brake shoes or pads against the drum or rotor.
PRE-PROGRAM DISCUSSION QUESTIONS
1. What type(s) of braking system are you familiar with? Can you describe how it/they
work(s)?
2. How do you know when a vehicle needs brake repairs? What are some of the clues?
3. What do you think is the most common brake repair that you will perform?
4. Can you name some variables or causes of brake wear?
5. What are some safety measures that should be considered when performing brake
repairs?
6. What is the last thing you should do before releasing a repaired vehicle to its owner?
POST-PROGRAM DISCUSSION QUESTIONS
1. Now that you have seen the Braking System Repair video, can you name and describe
one of the three methods braking systems used to slow the speed of a car? Can you
name the two others?
2. In what way does the parking or emergency brake differ from conventional brakes?
3. If the vehicle you’re working on has collision damage around one of the wheels, what
assembly will you most likely remove, and why?
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