Getting Your Car Ready Before a Long Drive

Check your tires, fluids, and brakes before you leave

A breakdown on the highway costs time and money you did not plan for. Before a road trip, spend an hour on the basics: tire pressure and tread, engine oil, coolant, brake fluid, and windshield washer fluid. These are the things that fail most often and cause the most trouble when you are far from home.

Tire pressure matters more on long drives because heat builds up as you travel. Check pressure when the tires are cold — before you have driven or at least three hours after you stop. The correct pressure is on a sticker inside the driver's door frame, not on the tire itself. Tread depth should be at least 4/32 of an inch; use a penny inserted upside down into the groove — if you can see the top of Lincoln's head, the tread is too worn.

For fluids, locate the dipstick for oil, the coolant reservoir cap, and the brake fluid reservoir under the hood. Top off anything that is low. If oil is dark and thick, change it before you go; old oil breaks down faster under the stress of highway driving. Check your spare tire too — make sure it holds air and that you have a jack and lug wrench in the car.

Key Takeaways

• Check tire pressure when cold, tread depth with a penny, and all fluid levels before you leave, because these failures strand you far from home.
• Have your brakes inspected if you hear noise, feel vibration, or have not had them checked in the last year, since brake failure is dangerous on long descents.
• Test your battery, lights, wipers, and air conditioning at home where you can fix problems, not on the road.
• Pack a basic emergency kit with jumper cables, a flashlight, a first aid kit, and a phone charger so you can handle minor problems yourself.
• Tell someone where you are going and when you expect to arrive, so they know to check on you if you do not show up.

Test your brakes, lights, and wipers before you drive

Brakes are the one system where a failure can hurt you. If you hear squealing, grinding, or a soft pedal that sinks when you press it, have a mechanic look at the brakes before the trip. Do not assume the noise will go away. If your last brake service was more than a year ago, get them inspected now — the cost of an inspection is far less than the cost of brake failure on a mountain road or in heavy traffic.

Turn on your headlights, high beams, fog lights if you have them, and brake lights — have someone stand behind the car to confirm the brake lights work. Test your turn signals in all four directions. Wiper blades wear out and leave streaks; if yours do not clear the windshield in one swipe, replace them. Test your air conditioning and heating too, because you will need them to stay alert and comfortable on a long drive.

Pack an emergency kit and tell someone your route

An emergency kit does not need to be fancy. Keep jumper cables, a flashlight with extra batteries, a basic first aid kit, and a phone charger in the car. Add a spare serpentine belt if you know how to install one, a quart of oil, coolant, and brake fluid in case you need to top off on the road. A small tool kit with pliers, a wrench, and a screwdriver handles most minor roadside fixes.

Before you leave, tell a family member or friend where you are going, what route you are taking, and when you expect to arrive. Give them your cell phone number and ask them to contact you if you do not check in by a certain time. This matters most if you are driving alone or through areas with spotty cell service — if something goes wrong, someone will know to look for you.

Plan for weather and road conditions on your route

Check the weather forecast for your entire route, not just your starting point and destination. A storm that is hours away now might hit while you are driving. If heavy rain, snow, or ice is predicted, consider postponing the trip or leaving earlier to avoid driving in the worst conditions.

Look up the route itself — are there mountain passes, long stretches without services, or roads known for heavy traffic? If you are driving through mountains, know that brakes work harder on long descents and your engine needs to cool. Shift to a lower gear on downhill sections to use engine braking instead of riding the brakes, which can cause brake fade and failure. If you are driving through desert or remote areas, carry extra water and know where gas stations are located.

Get a professional inspection if the car has high mileage or is older

If your car has more than 100,000 miles or is more than ten years old, consider a pre-trip inspection by a mechanic. They can spot problems you might miss — worn suspension, transmission issues, or electrical problems that could leave you stranded. The inspection costs money upfront but prevents a breakdown that costs far more and ruins your trip.

A mechanic will also check your battery, alternator, and starter — the electrical system that keeps the car running. On a long drive, a weak battery might fail partway through. They can test the transmission fluid, power steering fluid, and other systems that wear over time. If the mechanic finds something that needs repair, you have time to fix it before you leave.

Clean your windshield and adjust your mirrors and seat

A clean windshield matters more on a long drive because you spend hours looking through it. Use glass cleaner on the inside and outside, and clean your headlights too — cloudy headlights reduce visibility at night. Stock your car with extra windshield washer fluid; you will use more than you think on a highway.

Adjust your seat, mirrors, and steering wheel before you leave so you are comfortable and can see clearly. A seat that is too far back or too close strains your back and neck over hours of driving. Your side mirrors should show a small sliver of your car's side and mostly the road behind you. Your rearview mirror should show the full rear window. Take a test drive around town to make sure everything feels right before you commit to the highway.

Frequently Asked Questions

How often should I check tire pressure on a long road trip?

Check tire pressure before you leave and again after every 500 miles or every fuel stop, whichever comes first. Tires heat up as you drive and pressure rises; this is normal. Do not let air out of a hot tire — wait until it cools or check it the next morning. If pressure drops more than 5 pounds between stops, you may have a slow leak and should have the tire inspected.

What should I do if my check engine light comes on before the trip?

Do not ignore it. The light means your engine's computer detected a problem — it could be minor, like a loose gas cap, or serious, like a misfiring cylinder. Have a mechanic read the code before you leave. A loose gas cap is a five-second fix; a real problem could strand you on the highway.

Is it worth replacing my battery before a long trip if it is old?

If your battery is more than three years old and you are driving through remote areas or in cold weather, yes. A battery that works fine in town might fail when you are far from help. A mechanic can test your battery's condition for free or low cost; if it is weak, replacing it costs less than a tow truck.

What if I notice a problem while I am driving?

Pull over safely as soon as you can. If you hear a new noise, feel vibration, or notice a warning light, stop and inspect the car. Check your tire pressure, look for leaks under the car, and make sure all lights work. If you cannot find the problem or it seems serious, call roadside assistance or a tow truck rather than pushing forward and risking a breakdown in a worse location.

Should I have my car serviced before a road trip?

Not necessarily a full service, but a pre-trip inspection is worth the cost. If your car is due for an oil change, do it before you leave — fresh oil handles the stress of highway driving better. If other maintenance is due soon, consider doing it now rather than waiting until after the trip, so you start with a car in top condition.