How Cars Work, Explained

CarSpareFinder no longer runs a parts quoting service. What it does have is a library of guides written by a vehicle engineer — how each system on a car works, and what a service actually covers. No jargon for its own sake, and nothing you need to sign up for.

How a car works

Fourteen parts, working through the car system by system.

• The Petrol Engine

  Suck, squeeze, bang, blow — the four stroke cycle and the timing that keeps it honest.

• Braking

  Why a modern car effectively has three brake systems, not one.

• Tyres

  Four contact patches the size of a size 9 shoe, clearing five litres of water a second.

• All 14 parts →

  Structure, engines, fuel, ignition, clutch, gearbox, final drive, suspension, steering and electrics.

Servicing

What gets checked, what gets replaced, and why the intervals are what they are.

• Weekly Checks

  Twenty minutes and two cheap gauges, and you catch the expensive faults early.

• The Major Service

  Including the brake fluid change almost nobody ever asks for.

• All 5 parts →

  From general principles through to a full major service.

Owning a car

Buying, insuring and working on one, rather than how the machinery works.

• Breakdown Cover

  Roadside, recovery, home start and European — what separates them.

• Uneconomical To Repair

  Why a written-off car can fetch nearly as much in pieces as it does whole.

• Staying Safe

  Axle stands, batteries, fuel and welding. The rules that are not optional.

Our other sites

• carsparefinder.co.uk

  Step-by-step repair guides for specific makes and models — the sister site to this one.

• carunited.co.uk

  Car parts.

• scrap-car.co.uk

  Scrap car quotes.