Why a Pre-Trip Check Matters

Most highway breakdowns don't come out of nowhere. A slow tire leak, low coolant, or a brake pad worn past its limit are all detectable before you leave the driveway — if you look. A structured safety check takes less than an hour and dramatically reduces your exposure to roadside emergencies, especially on long stretches between service areas.

This checklist is organized by vehicle system so you can work through it methodically. If your car has more than 100,000 miles on it, pay extra attention — see our maintenance guide for high-mileage vehicles for the additional items worth monitoring.

Tires

Check tire pressure on all four tires — including the spare — using a gauge when tires are cold. Must
Inspect tread depth across the full width of each tire; replace any tire at or below 2/32 of an inch. Must
Look for visible sidewall damage, bulges, cracking, or embedded objects such as nails or screws. Must
Confirm the spare tire is properly inflated and that your jack and lug wrench are accessible. Should

Brakes

Listen for squealing or grinding when braking during a slow test stop in a quiet area before departing. Must
Note any pulling to one side or a spongy pedal feel — both are signs requiring inspection by a qualified mechanic. Must
Check brake fluid level in the reservoir; a low level may indicate pad wear or a leak. See our brake warning signs guide if anything seems off. Must

Fluids

Check engine oil level using the dipstick with the engine off and the car on level ground. Must
Verify coolant level in the overflow reservoir; never open the radiator cap on a hot engine. Must
Confirm windshield washer fluid is full — visibility matters especially at highway speeds. Should
Inspect transmission fluid and power steering fluid if your vehicle has dedicated reservoirs and you have access. Nice to have

Lights and Electrical

Test all exterior lights: headlights (low and high beam), taillights, brake lights, and turn signals. Must
Check that hazard flashers work; you'll need them if you're ever stopped on the shoulder. Must
Verify the battery terminals are clean and free of corrosion; a weak battery is a common cause of unexpected no-starts. Our guide to your car's electrical system explains what to watch for. Should

Under the Hood

Scan the dashboard for any active warning lights before starting your drive; address anything illuminated. Must
Inspect belts for visible fraying, cracking, or glazing; a snapped belt mid-trip will leave you stranded. Should
Check hoses for soft spots, cracks, or leaks at connection points. Should

Emergency Gear

Pack a roadside emergency kit: reflective triangles or flares, jumper cables or a jump starter, and a basic first-aid kit. Must
Bring a phone charger and keep a physical map or downloaded offline map as a backup. Should
Store a flashlight, gloves, and basic tools (tire pressure gauge, multi-tool) in an easily accessible spot. Should
Include water and a light snack in the vehicle in case of an extended roadside delay. Nice to have

Tools and Resources to Have Ready

You don't need a mechanic's toolbox to run through this checklist, but a few basic items make it faster and more accurate. Keep these on hand before you start your inspection.

Required

Tire Pressure Gauge

Measures PSI in each tire so you can inflate to the vehicle manufacturer's recommended level.

Required

Flashlight or Headlamp

Lets you inspect under the hood, underneath the vehicle, and inside the wheel wells clearly.

Required

Clean Lint-Free Rag

Used to wipe the oil dipstick and any fluid reservoir caps before and after checking levels.

Optional

Tread Depth Gauge

Provides an accurate measurement of remaining tire tread; a penny can work as a rough alternative.

Optional

OBD-II Scanner

Reads diagnostic trouble codes if your check engine or other warning light is active.

If any check reveals a potential problem — an illuminated warning light in particular — don't guess at the cause. Our guide on what your check engine light is actually telling you walks through when it's urgent and what to do next.

Don't Ignore Active Warning Lights

A dashboard warning light that appeared recently should be diagnosed before a long trip, not after. Some lights — particularly those related to brakes, oil pressure, or engine temperature — can indicate conditions that worsen quickly under highway driving. Have the vehicle inspected by a qualified mechanic if you're unsure of the cause.

Before You Pull Out of the Driveway

Once you've completed your vehicle inspection, take five minutes to confirm a few non-mechanical items. Make sure your license, registration, and proof of insurance are in the car. Share your route and expected arrival time with someone you trust. If you're planning a multi-day drive, learn the warning signs of highway hypnosis and driver fatigue before you hit monotonous stretches of road — it's a risk many drivers underestimate.

For a broader pre-departure checklist that covers documents, bookings, and home prep, see your pre-trip checklist before leaving home. Safe travels start before the engine turns over.

Brake Problems Should Be Inspected Immediately

If your brake check reveals any abnormal sounds, pedal feel, or fluid loss, do not defer service until after your trip. Brakes are the single most critical safety system on your vehicle, and highway driving at speed significantly increases stopping distances. A qualified mechanic should evaluate brake concerns before departure — not as a return item.