Before you go
Pre-Trip Car Checkup: The 15-Minute Inspection That Prevents Breakdowns
The quick inspection to do about a week before a road trip — fluids, tires, battery, and lights — so the most common breakdowns never happen.
Most roadside breakdowns are preventable, and they cluster around a short list: tires, the battery, and overheating. A 15-minute look-over before you leave catches almost all of them — and the reason to do it about a week out is simple: it leaves time to fix anything you find before you’re 300 miles from home.
This guide walks the checklist a mechanic (and AAA) would run: fluids, tires, battery, belts and hoses, wipers, and lights. The printable PDF is the checklist itself.
What you’ll learn
- Why to do it ~a week before (not the morning of)
- The fluids to check and top off
- How to check tire pressure and tread the right way
- Battery, belts, hoses, wipers, and lights
- The three breakdowns this prevents
Fluids: check and top off
Pop the hood and check the levels: engine oil (and whether it’s due for a change — a long trip is hard on old oil), coolant/antifreeze, brake fluid, power steering, and washer fluid (top it up, ideally with a bug-cutting formula). If the oil is dark and overdue, change it before you go, not after.
Low or dirty coolant is the classic cause of summer overheating, so don’t skip it — and never open a hot radiator cap to check it; do it cold.
Tires: pressure, tread, and the spare
Set tire pressure to the number on the driver’s door-jamb sticker — the manufacturer’s spec — not the “max press” molded on the sidewall (that’s a ceiling, and running it gives a harsh ride and higher blowout risk). Check pressure when the tires are cold (parked a few hours); don’t bleed down a hot tire or it’ll be underinflated once it cools.
Check tread with the penny test: insert a penny with Lincoln’s head down — if you can see the top of his head, you’re at or below 2/32" and the tire needs replacing (the U.S. legal minimum in most states). Many pros suggest replacing around 4/32" because wet stopping power drops off sharply below that. And don’t forget the spare — confirm it’s inflated with good tread, and that the jack and lug wrench are actually in the car.
Battery, belts, hoses
Car batteries typically last 3–5 years (less in hot climates), and battery trouble is one of AAA’s top causes of breakdowns. If yours is past three years, have it tested — a cheap test now beats a no-start at a trailhead. Clean any corrosion off the terminals.
Glance at the drive belts and radiator hoses: replace belts that look cracked, glazed, or frayed, and hoses that are brittle, bulging, or mushy. These are cheap parts that strand you when they fail.
Wipers and lights
Replace wiper blades that streak or chatter — you’ll want them in the one storm you didn’t plan for. Then walk around the car (or have someone help) and confirm every exterior light works: headlights (both beams), brake lights, turn signals, reverse, and hazards. A burned-out brake light is both a safety risk and an easy ticket.
The setup, step by step
- Check the fluidsOil (change if overdue), coolant, brake, power steering, washer — top off as needed, all when cold.
- Set tire pressure coldTo the door-jamb spec, not the sidewall max. Include the spare.
- Check tread + sparePenny test (replace at 2/32"); confirm the spare, jack, and wrench are present.
- Test the batteryIf it’s 3+ years old, get it tested and clean the terminals.
- Belts, hoses, wipers, lightsReplace anything cracked or streaking; confirm every exterior light works.
Get the printable field guide (free)
Four pages with the diagrams, the runtime table, and the safety checklist — clean enough for the glovebox or the group chat. Drop your email and it downloads instantly.
Recommended gear
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Check it
Common questions
What should I check on my car before a road trip?
Fluids (oil, coolant, brake, power steering, washer), tire pressure (to the door-jamb spec, cold) and tread, the spare and jack, the battery (if 3+ years old), belts and hoses, wiper blades, and all exterior lights. Do it about a week ahead so you can fix anything you find.
How do I check tire tread?
Use the penny test: insert a penny with Lincoln’s head pointing down. If you can see the top of his head, the tread is at or below 2/32" (the legal minimum in most states) and the tire should be replaced.
What tire pressure should I use?
The number on the driver’s door-jamb sticker (the manufacturer’s spec), not the “max press” on the sidewall. Set it when the tires are cold.
How long do car batteries last?
Typically 3–5 years, less in hot climates. Battery trouble is a top cause of breakdowns, so have a 3+-year-old battery tested before a long trip.
Informational guide only — not affiliated with, authorized by, or endorsed by Starlink or SpaceX, or any product maker named here. Power figures are approximate and vary by firmware, conditions, and gear; always follow your equipment’s instructions and verify its ratings before use.