Vehicle Systems Explained
Part of the Car parts 101 guides.
A plain-language guide to how a vehicle’s systems work and how they interact — engine, transmission, suspension, steering, brakes, electrical and cooling. Use it to understand the vehicle before choosing parts or diagnosing a fault.
How the major systems work
Start with the system, then narrow to the component.
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Frequently asked questions
Which system should I learn first?
Start with the engine, transmission and brakes, because they account for the majority of repair cost and parts demand. Suspension and electrical follow.
Do these explanations cover EVs?
Where relevant, yes. EV-specific systems differ mainly in the drivetrain and thermal architecture, while brakes, suspension and body systems remain familiar.