Learning how do I use a car jack is a fundamental skill for any driver. Using a car jack safely means finding a solid lift point on your vehicle’s frame and working on level ground. This guide will walk you through the entire process, from preparation to lowering your car, ensuring you can change a tire or perform basic maintenance with confidence.
Having this knowledge can turn a stressful roadside situation into a manageable task. It also empowers you to handle routine maintenance at home. We will cover the types of jacks, the crucial safety steps, and the detailed procedure to lift your vehicle correctly.
How Do I Use A Car Jack
This section provides the core, step-by-step instructions for using a standard scissor or hydraulic floor jack. Following these steps in order is essential for your safety and to prevent damage to your vehicle.
Prepare Your Vehicle And Workspace
Never skip preparation. A rushed job is an unsafe job. Start by finding a level, solid surface like concrete or asphalt. Avoid dirt, grass, or gravel, as the jack can sink or shift.
Engage your parking brake fully. If you are changing a rear tire, place wheel chocks or heavy blocks behind the front tires. For a front tire, chock the rear tires. This prevents the car from rolling.
If you are changing a tire, loosen the lug nuts on the wheel you will lift before you raise the car. Break them loose with your wrench while the car’s weight is still on the ground. You only need to loosen them about a quarter-turn for now.
Locate The Correct Jack Point
This is the most critical step to avoid damaging your car’s underbody. Do not jack the car on plastic body panels, the oil pan, or any part that looks weak.
Consult your owner’s manual for the precise jack points. For most modern unibody vehicles, there are reinforced metal notches or pads along the side sill, just behind the front wheels or ahead of the rear wheels. For trucks and older frame vehicles, the jack point is often on the axle or a specific part of the frame.
If you are using the emergency scissor jack that came with your car, it must contact the designated jack point. A floor jack can often be positioned under a central subframe point, but the side sill points are always a safe bet.
Common Jack Point Locations
- Side Sill Reinforcements: Small metal notches or ridges along the bottom edge of the car’s door frame.
- Front Crossmember/Subframe: A sturdy central beam behind the front bumper (for floor jacks).
- Rear Differential (RWD vehicles): The solid center of the rear axle assembly.
- Factory-Specified Axle or Frame Points: Clearly marked on trucks and SUVs.
Position And Operate The Jack
Place the jack so its saddle (the lifting pad) contacts the jack point squarely. For a scissor jack, ensure the top groove fits securely into the vehicle’s notch. For a hydraulic floor jack, center the pad.
Begin pumping the jack handle slowly and steadily. For a scissor jack, turn the crank. For a hydraulic jack, pump the lever up and down. Watch the contact point closely as the car begins to rise.
Lift the car only until the tire clears the ground by about one to two inches. There is no need to lift it higher than necessary. Excessive height makes the car less stable.
Place Jack Stands For Safety
This is non-negotiable if you are going under the vehicle. A jack is a lifting device, not a support device. It can fail or settle.
With the car lifted, slide a jack stand under a solid, load-bearing part of the vehicle’s frame or axle. Position it near the jack, but on a different, equally strong point if possible. Slowly lower the jack until the car’s weight rests securely on the jack stand. The stand’s locking pin should be fully engaged.
For added safety, place a second jack stand on the opposite side of the same axle. Gently shake the car to test its stability on the stands before you begin any work.
Lower The Vehicle Correctly
Once your work is complete, reverse the process carefully. If you used jack stands, raise the jack slightly to take the vehicle’s weight off the stands first.
Remove the jack stands. Then, very slowly, operate the release valve on your jack. For a hydraulic jack, turn the release valve slowly. For a scissor jack, turn the crank in the opposite direction. Control the descent; do not let the car drop suddenly.
Once the car is fully on the ground, if you changed a tire, now you can fully tighten the lug nuts in a star pattern to ensure the wheel is seated evenly.
Choosing The Right Type Of Car Jack
Not all jacks are the same. Using the wrong one for your vehicle or task can be dangerous. Here are the most common types you will encounter.
Scissor Jacks
This is the compact, lightweight jack that comes with most cars for emergency tire changes. It operates by turning a threaded screw with a provided crank.
- Best For: Emergency roadside tire changes only.
- Pros: Small, portable, and included with the vehicle.
- Cons: Slow to operate, low lifting capacity, and unstable for prolonged work.
Hydraulic Floor Jacks
These are the low-profile jacks with a long handle and wheels, common in home garages. They use hydraulic fluid to lift heavy loads with minimal effort.
- Best For: General maintenance, tire rotations, and brake work in a garage.
- Pros: Easy to use, fast lifting, high weight capacity, and stable base.
- Cons: Heavy, bulky, and requires level ground. Not suitable for most roadside use.
Bottle Jacks
These are compact, vertical hydraulic jacks shaped like a bottle. They have a high lifting capacity relative to their size.
- Best For: Trucks, SUVs, and heavier vehicles. Often carried as a roadside alternative.
- Pros: High lift capacity in a small footprint.
- Cons: Can have a high minimum height, making them difficult to fit under low cars. Less stable base than a floor jack.
Jack Stands
While not a jack, jack stands are the essential partner to any jack. They are rigid, adjustable supports that hold the vehicle up after you lift it.
- Critical For: Any situation where you will place any part of your body under the vehicle.
- Always use them in pairs. Never rely solely on a jack to hold a car up while you work.
Essential Safety Precautions You Must Follow
Ignoring safety turns a simple task into a hazardous one. A falling car can cause serious injury or death. Adhere to these rules every single time.
Never Work Under A Supported Only By A Jack
This cannot be stressed enough. Jacks can leak, slip, or fail mechanically. Always place quality, rated jack stands under the vehicle’s frame before you get underneath it. Even for a quick look, it is not worth the risk.
Use Wheel Chocks
Wheel chocks are wedges placed against the tires that remain on the ground to prevent rolling. If you don’t have commercial chocks, a large stone or a block of wood can work in an emergency. They are a simple and effective barrier against the car moving.
Check Your Jack’s Weight Rating
Every jack has a maximum weight capacity. This information is stamped or printed on the jack. Your vehicle’s gross weight is listed on the driver’s side door jamb sticker. Ensure your jack’s capacity exceeds your vehicle’s weight. Using an underrated jack is asking for it to collapse.
Avoid Soft Or Uneven Ground
Lifting on dirt, gravel, or sloped ground dramatically increases the chance the jack will shift or sink. The car can topple over. Always seek out firm, level pavement. If you have a flat on a soft shoulder, try to drive the car slowly to a firmer spot, even if the tire is damaged.
Common Mistakes To Avoid When Using A Jack
Being aware of these frequent errors will help you avoid them and complete the job safely.
Jacking On The Wrong Part Of The Car
Lifting on a brake rotor, control arm, or floor pan can cause expensive, dangerous damage. The car may also slip off the jack. Always double-check your owner’s manual for the correct points.
Over-Lifting The Vehicle
Lifting the tire more than a few inches off the ground creates a less stable situation. It also puts extra strain on the jack and the jack point. Lift only as high as you need to remove the tire or access the component.
Forgetting To Set The Parking Brake
This simple step is often overlooked in a panic. The parking brake, combined with wheel chocks, is your primary defense against the car rolling off the jack.
Using Damaged Or Worn Equipment
Inspect your jack and stands before each use. Look for cracks, significant rust, bent parts, or hydraulic fluid leaks. A faulty piece of equipment should be replaced immediately, not used “just one more time.”
Frequently Asked Questions
Where Is The Jack Point On My Car?
The most reliable source is your vehicle’s owner’s manual. For most cars, look for reinforced metal notches or pads on the underside of the side rocker panels, just behind the front wheels or ahead of the rear wheels. Never jack on plastic, the oil pan, or exhaust parts.
Can I Use Any Jack For My Car?
No. You must use a jack with a weight capacity higher than your vehicle’s gross weight. The factory scissor jack is designed for your specific model. For a floor jack, ensure it is rated for your vehicle’s type—a compact car jack may not safely lift a large truck.
How Do I Safely Jack Up A Car To Change A Tire?
Park on level ground, set the parking brake, and chock the opposite wheels. Loosen the lug nuts slightly. Position the jack on the designated jack point. Lift the car until the tire is just off the ground. Change the tire, then lower the car and fully tighten the lug nuts.
Why Do I Need Jack Stands If I Have A Jack?
A jack is for lifting only. Jack stands are for supporting. Hydraulic jacks can slowly leak down, and mechanical jacks can fail. Jack stands are locked in place and provide a secure, stable support system for any work underneath the vehicle.
What Should I Do If My Car Starts To Slip Off The Jack?
If the car begins to shift or slip, do not try to catch it or stop it. Immediately move your body completely out from underneath the vehicle. Let the jack fail and allow the car to settle on the ground. Your safety is paramount; property damage can be repaired.