what's inside: under the hood

The Under the Hood Channel explores the systems that make your car function correctly. Learn about car parts and systems and how to do routine maintenance.

Braking

Braking

Knowing your car’s brakes are functioning properly is crucial. Learn the differences between disc and drum brakes, how anti-lock brakes work and more. See more »

Engines

Engines

The Car Engine Information Channel explores engine performance, maintenance and new fuel technologies. Learn how car engines work. See more »

Explore These Categories:

Exhaust & Emissions

Exhaust & Emissions

This section can help you keep your exhaust system working properly. Learn how mufflers, catalytic converters and oxygen sensors work. See more »

Options

Options

Your car may come with many standard features, but upgrade and accessory options are endless, starting with the windshield wiper blades. See more »

Steering & Suspension

Steering & Suspension

The Car Steering and Suspension Channel explains the systems that help keep your car driving smoothly and precisely. Learn about auto suspension and steering. See more »

Other Systems

Other Systems

Learn about the various electrical and other systems that lurk under your hood, including cooling systems, ignitions, wires, fuses and connectors. See more »

Transmissions & Drivetrain

Transmissions & Drivetrain

Upkeep of your transmission may save you money in the long run. Learn manual and automatic transmission basics, then move on to clutches, differentials and torque converters. See more »

Wheels

Wheels

How do 30 pounds of air in your tires hold up two tons of car? What’s the technology behind the tire and how do wheels work? Learn it all in the Car Wheels and Tires Channel. See more »

featured articles

FPO

How Disc Brakes Work

Disc brakes are the most common brakes found on a car's front wheels, and they're often on all four. This is the part of the brake system that does the actual work of stopping the car. Find out all about disc brakes.

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FPO

How CVTs Work

In a regular transmission the gears are literal gears -- interlocking toothed wheels. Continuously variable transmissions, on the other hand, don't have interlocking gears. The most common type operates on a pulley system. Learn all about the smooth-operating ultra-efficient CVT.

FPO

What will "luxury car" mean in 2030?

If pressed upon to name features in the luxury cars of the future, Japanese Zen garden might not be the first thing to come to your mind. But perhaps it should be. What concept cars are influencing future autos?

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