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Automotive Basics Unit 5: Brakes
Terms in this set (28)
When something is in motion it wants to stay in motion.
Types of brakes
Disc, drum, and emergency brake. Most vehicles have all three
Generally found in the front wheels of a vehicle
Components of disc brakes
Rotor, brake pads, caliper
Disc brake rotor
Turns with the wheels, gives the system something to stop without directly contacting the wheels. Similar to a CD.
Stationary. Similar to holding a CD in between flour pointer finger and thumb.
Brake pedal is pressed. Brake fluid in system is forced toward the caliper. Caliper reacts by squeezing the brake pads which squeeze both sides of the rotor. This slows the rotor to a stop.
Made of strong heat resistant friction material. Will be in contact with the rotor every time the brakes are pressed.
First kind of brakes, became not functional as vehicles got faster and heavier. Found in the back of the vehicle.
Drum brake components
Brake shoes and the drum itself
Acts as the rotor, but is more like a spinning hamster wheel than a CD.
Similar to the brake pads in the disc system. The drum is not exposed, so it has a hard time cooling off which makes it less effective.
Most of the braking comes from...
The front (90%)
Mechanical. Does not rely on brake pedal and brake fluid.
Emergency brake process
When lever is pulled, the brake cable pulse the brake into position. Connects to the rear brake system (drum system).
The emergency brake would...
Still work even if the other brake systems don't
A special metal clip on a brake pad that makes noise when the brake is getting too thin. When you hear this sound you should get new brakes soon.
If you don't hear the squealer...
and if you continue drive on work brake pads, they will begin to grind on the rotor. This means that the brakes are at the very end of their lives, and they probably won't brake safely. The rotor will likely be damaged.
If a vehicle pulls to one side when braking, then the wheel that is pulling must move braking power than the other.
If the brake pads are worn down...
Replace them. If the vehicle is still pulling even after the brake pads were replaced, then the other side must not be braking enough.
Brake pads thinner than 1/8 of an inch
They need to be replaced
If there is a spongy or squishy feel when you press the brake, then there is probably air in the brake lines. You will need to have the siren flushed: old fluid removed and new fluid added to force all air out of the system.
When changing one brake...
Always change the other one
Relies on liquid to transfer pressure form one area to another.
Stir up brake dust (asbestos). Always wear a dust mask. Wipe surfaces with a damp cloth.
Replace the lifting jack with the jack stand when the vehicle has been lifted.
Disc brake spreader
Presses the piston back to the caliper, making room for thicker brake pads. A C-clamp also works.
Both the C clamp and the jack stand...
Must be used with the old inside brake pad still in place.
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