What Happens If You Never Use Your Car’s Parking Brake?
By Azka Kamil – Automotive Enthusiast
Many American drivers with automatic transmissions rarely use their parking brake. They put the transmission in Park (P), turn off the engine, and walk away.
But is that actually good for your vehicle?
The short answer is: your car may continue to function normally for years, but never using the parking brake can leave an important safety system untested and can place unnecessary load on the transmission's parking mechanism—especially when parking on an incline.
Modern vehicles may use a traditional hand-operated parking brake, a foot-operated brake, or an Electronic Parking Brake (EPB). Although the technology differs, the purpose remains the same: help prevent a stationary vehicle from moving.
In the United States, federal safety standards require passenger cars to be equipped with a parking brake system. NHTSA's interpretation of Federal Motor Vehicle Safety Standard No. 135 states that passenger cars, including those with automatic transmissions, must have a parking brake.
So what happens if you almost never use it?
What Is a Parking Brake Actually Designed to Do?
A parking brake—sometimes called an emergency brake or handbrake—is designed primarily to keep a parked vehicle from moving.
It is separate from the normal brake pedal system in important ways.
Depending on the vehicle, the parking brake may operate through:
Mechanical cables
Rear brake mechanisms
Drum-in-hat systems
Rear calipers
Electronic actuators
Integrated electronic parking-brake systems
Federal Motor Vehicle Safety Standard No. 135 describes the parking brake as a mechanism intended to prevent movement of a stationary motor vehicle. NHTSA also explains that the standard requires passenger vehicles to have a parking brake system.
That means the parking brake isn't simply an optional feature that exists because manufacturers want another button or lever in the cabin.
It is part of the vehicle's safety system.
1. Your Transmission's Parking Mechanism May Carry the Vehicle's Weight
One of the biggest reasons to use the parking brake is to avoid relying entirely on the transmission's Park (P) position.
When an automatic transmission is placed in Park, a mechanical locking mechanism prevents the drivetrain from rotating.
This is commonly referred to as the parking pawl.
The parking pawl is not designed to be the only thing preventing a vehicle from moving on every type of parking surface.
Consider what happens when you park on a hill:
You stop the vehicle.
You put the transmission in Park.
You release the brake pedal.
The vehicle moves slightly.
The drivetrain loads against the parking mechanism.
You may sometimes feel a small “clunk” when you later shift out of Park.
That does not automatically mean something has broken. It can be a result of the vehicle's weight loading the parking mechanism.
Some manufacturers specifically recommend applying the parking brake when parking and provide procedures for parking on grades.
For example, Ford's owner information instructs drivers to apply the parking brake whenever they park.
2. Parking on a Hill Makes the Difference More Important
On a flat driveway, the consequences of not using the parking brake may seem insignificant.
A hill is different.
Gravity is constantly trying to move the vehicle downhill.
If you simply select Park and release the brake pedal, the vehicle can settle against the transmission's parking mechanism.
This is particularly relevant when:
Parking on a steep driveway
Parking on a hill
Parking with a trailer
Parking a heavy SUV
Parking a pickup truck
Parking on uneven ground
Toyota's owner documentation, for example, recommends applying the parking brake firmly when parking on a slope and provides additional precautions for vehicles towing trailers.
For a vehicle parked on a significant incline, using the parking brake is therefore more than a habit—it is part of proper parking technique.
3. You May Not Discover a Parking Brake Problem Until You Need It
This is one of the most overlooked consequences of never using the parking brake.
Imagine you haven't activated your parking brake for several years.
Then one day you need it.
You pull the lever or press the button—and discover that:
The brake does not hold the vehicle properly.
The cable has excessive slack.
The electronic parking brake produces an error.
The system does not fully engage.
The brake warning light appears.
The mechanism is partially seized.
The problem isn't necessarily that you caused the failure by not using the brake.
Rather, you may have gone years without testing a safety system that you might eventually need.
Regular operation can also make unusual noises, resistance, warning lights, or engagement problems easier to notice.
4. Traditional Mechanical Parking Brakes Can Develop Problems
Older and simpler vehicles frequently use a mechanical parking-brake cable.
The cable connects the driver's lever or pedal to the rear brake mechanism.
Over time, components can experience:
Corrosion
Cable stretching
Contamination
Moisture exposure
Mechanical wear
Seized components
Loss of adjustment
Ford's brake information notes that parking-brake cables can slightly increase in length with continuous use because they are made from metal wires.
That doesn't mean using the parking brake damages the cable.
It means the mechanism is subject to normal mechanical wear and may require inspection or adjustment over the vehicle's lifetime.
If a parking brake is never used, a developing problem may remain unnoticed.
5. Rust and Corrosion Can Become a Bigger Concern in Some Areas
Climate matters.
Vehicles in parts of the United States where roads are treated with salt during winter can experience significantly different corrosion conditions from vehicles in dry climates.
Parking-brake components can be exposed to:
Road salt
Water
Snow
Mud
Road debris
Humidity
This is particularly relevant for vehicles that spend winters in states such as Michigan, Ohio, Pennsylvania, New York, Wisconsin, Minnesota, and other northern regions.
The solution isn't to avoid the parking brake.
Instead, owners should follow the vehicle manufacturer's maintenance recommendations and have the braking system inspected when appropriate.
6. Your Parking Brake Is Not the Same as Your Regular Brake
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| Parking Brake |
A common misconception is that the parking brake is simply another version of the brake pedal.
It isn't.
The service brakes are primarily designed to slow and stop a moving vehicle.
The parking brake is primarily designed to hold a stationary vehicle.
Modern vehicles can use different designs, but the functions remain distinct.
This distinction becomes important if there is ever a problem with the normal braking system.
A properly functioning parking brake provides another mechanism for securing the vehicle when parked.
NHTSA's federal standards specifically address parking-brake performance as part of vehicle braking requirements.
7. Modern Electronic Parking Brakes Change the Equation
Many newer vehicles no longer have a traditional hand lever.
Instead, they use an Electronic Parking Brake (EPB).
You may recognize it as a small button marked with a brake symbol.
Instead of physically pulling a cable from the cabin, the electronic system activates an actuator that applies the parking brake.
Modern systems may also include automatic functions.
For example, some vehicles can automatically apply the parking brake when the transmission is shifted into Park.
NHTSA addressed this technology in a 2024 interpretation concerning electronic parking brakes. The agency stated that the parking-brake indicator must activate when the parking brake is engaged, including when the system engages automatically rather than through the driver's manual operation of the control.
That is an important distinction.
If your vehicle automatically applies the electronic parking brake, you may actually be using it more often than you realize.
8. Never Using an Electronic Parking Brake Is Different From Never Using a Mechanical One
If your vehicle has an EPB with an automatic parking-brake function, you may not need to manually press the button every time you park.
The vehicle may activate the system automatically depending on its programming.
Therefore, the correct approach is:
Read your owner's manual.
Do not assume that every electronic parking brake operates the same way.
Some vehicles:
Automatically apply the EPB in Park.
Require the driver to press the EPB button.
Automatically release the EPB when driving away.
Offer automatic hold functions.
Integrate the parking brake with other driver-assistance systems.
The exact behavior varies by manufacturer and model.
9. Parking Brake vs. Park: Which Should You Use First?
For an automatic-transmission vehicle, a good general parking procedure is:
Stop → keep the brake pedal pressed → apply the parking brake → select Park → turn off the vehicle.
However, follow your specific owner's manual because manufacturers can provide model-specific instructions.
Ford, for example, explicitly instructs drivers to apply the parking brake, shift into Park, switch the ignition off, and remove the key before leaving the vehicle.
Some manufacturers provide particularly detailed instructions for parking on hills.
The important concept is to prevent the transmission's Park mechanism from becoming the only thing holding the vehicle.
10. What About Manual-Transmission Cars?
Manual-transmission vehicles don't have a Park position.
That's an important difference.
When parked, a manual-transmission vehicle is typically left in an appropriate gear, with the parking brake applied.
The exact procedure can vary depending on the slope and manufacturer recommendations.
For example:
Flat surface: parking brake + appropriate gear
Facing uphill: parking brake + appropriate gear + wheels positioned appropriately
Facing downhill: parking brake + appropriate gear + wheels positioned appropriately
On a steep grade, wheel positioning and wheel chocks can provide additional protection.
Toyota's owner information, for example, discusses applying the parking brake and selecting an appropriate transmission position when parking on slopes.
11. Does Never Using the Parking Brake Damage Your Car?
Not necessarily.
This is where online automotive advice can become misleading.
Simply leaving the parking brake unused does not automatically mean your transmission, brakes, or vehicle will be damaged.
However, it can create several disadvantages:
Potential problems include:
1. The parking brake may not be tested regularly
A failure can go unnoticed.
2. The transmission's parking mechanism may carry more load
This is particularly relevant on hills.
3. Mechanical parking-brake components may develop problems
Cable-operated systems can experience corrosion, stretching, or mechanical issues.
4. You lose an important layer of vehicle security
The parking brake is designed to help prevent vehicle movement.
5. You may discover a problem at the worst possible time
For example, when parking on a steep driveway or when another component of the braking system develops a problem.
So the correct conclusion isn't:
“Never using the parking brake will destroy your transmission.”
A more accurate conclusion is:
Never using it means you're not taking full advantage of a safety system designed to secure your vehicle when parked.
12. Is It Bad to Use the Parking Brake Every Day?
For most vehicles, no.
In fact, manufacturers commonly instruct drivers to use the parking brake whenever they park.
Ford's current owner information explicitly states: “Apply the parking brake whenever you park your vehicle.”
That includes routine parking.
The key is to use it correctly and release it completely before driving.
If the brake warning light remains illuminated after you start driving, investigate the issue instead of continuing to drive normally.
Ford's owner information states that if the parking-brake warning indicator remains illuminated when the parking brake is disengaged, it can indicate low brake fluid or a brake-system fault and should be checked.
13. What If the Parking Brake Feels Too Loose?
A loose parking brake can indicate a problem.
Possible causes can include:
Cable adjustment
Cable stretch
Worn components
Corrosion
Brake mechanism problems
Incorrect adjustment
Electronic parking-brake faults
Do not simply keep pulling the lever harder.
If a mechanical parking brake suddenly requires much more travel than usual, doesn't hold the vehicle, or behaves differently, have the system inspected.
For an electronic parking brake, warning messages or abnormal sounds should also be investigated according to the owner's manual.
14. What If the Parking Brake Won't Release?
Don't force it.
A parking brake that refuses to release can have several causes, including:
Frozen cable
Corrosion
Mechanical seizure
Electrical fault
Low battery voltage on some EPB systems
Brake-component problems
This is especially important in cold-weather states.
If the vehicle cannot safely move because the parking brake remains engaged, professional assistance may be necessary.
Driving with a partially applied parking brake can generate heat and damage brake components.
15. Parking on a Hill: A Safer Procedure
For an automatic vehicle, a practical procedure is:
Step 1: Stop completely
Keep your foot firmly on the service brake.
Step 2: Apply the parking brake
Engage the mechanical or electronic parking brake.
Step 3: Select Park
Move the transmission selector into P.
Step 4: Turn off the vehicle
Follow the normal shutdown procedure.
Step 5: Position the wheels
On a slope, position the steering wheels according to the direction of the grade and local safety guidance.
Step 6: Use wheel chocks when appropriate
Wheel chocks are especially important for certain heavy vehicles, trailers, and steep grades.
Toyota's owner documentation recommends wheel blocks for certain vehicle-and-trailer parking situations and emphasizes applying the parking brake firmly.
16. Does the Parking Brake Improve Transmission Longevity?
This claim needs some qualification.
It would be too strong to say:
“Using the parking brake will definitely make your transmission last longer.”
There isn't enough evidence to make that universal claim for every vehicle.
A better way to think about it is mechanical load distribution.
When a vehicle is parked on a slope, using the parking brake can help secure the vehicle rather than allowing the transmission's Park mechanism to take the vehicle's full settling load.
This can also make it easier to shift the selector out of Park on some vehicles.
The 2026 Jeep Wrangler owner's manual, for example, specifically notes that when parking on a hill with an automatic transmission, applying the parking brake before selecting Park can prevent the load on the transmission locking mechanism from making the selector difficult to move out of Park.
17. Does Using the Parking Brake Save Money?
Potentially, but the bigger benefit is risk reduction, not guaranteed repair savings.
A parking brake is relatively simple compared with major transmission repairs.
Regularly using it may help you notice:
Unusual resistance
Excessive lever travel
Warning lights
Abnormal electronic messages
Failure to hold the vehicle
Strange noises
Early detection can prevent a small maintenance issue from becoming a larger safety problem.
However, parking-brake components still require normal maintenance regardless of how frequently you use them.
18. How Often Should You Use Your Parking Brake?
For most drivers, the simplest answer is:
Use it whenever you park, unless your vehicle's owner manual specifies a different procedure.
This is especially important when:
Parking on a slope
Parking overnight
Parking for an extended period
Parking a heavy SUV
Parking a pickup
Towing a trailer
Parking on uneven terrain
Parking in areas where vehicle movement could cause property damage
Modern vehicles with automatic EPB functions may handle some of this automatically.
Again, check your vehicle-specific manual.
19. What Should You Do If You Haven't Used It for Years?
Don't panic.
You don't necessarily need to replace anything simply because you haven't used the parking brake.
Instead:
For a mechanical parking brake:
Try engaging it while the vehicle is safely parked on a level surface.
Check whether:
The lever or pedal feels normal.
The brake engages.
The warning indicator operates.
The vehicle remains securely stationary.
Do not perform a risky test on a steep hill.
For an electronic parking brake:
Follow the manufacturer's instructions.
Look for:
EPB warning messages
Brake warning lights
Unusual noises
Failure to engage
Failure to release
If anything appears abnormal, have the system inspected.
20. The Biggest Mistake: Treating Park as a Substitute
The most important lesson is simple:
“P” and the parking brake are not necessarily interchangeable.
The transmission's Park position prevents drivetrain movement through its locking mechanism.
The parking brake is designed specifically to help prevent a stationary vehicle from moving.
Some manufacturers explicitly warn drivers not to use Park as a substitute for the parking brake.
For example, Chrysler's Pacifica owner documentation states that drivers should not use Park as a substitute for the parking brake and should fully apply the parking brake when leaving the vehicle.
Frequently Asked Questions
Is it bad to never use your parking brake?
It isn't automatically damaging to the vehicle, but it means an important safety system isn't being regularly exercised or tested. It can also allow the transmission's Park mechanism to carry the vehicle's load when parked on an incline.
Should I use the parking brake every time I park?
Generally, yes. Several U.S. manufacturer owner manuals instruct drivers to apply the parking brake whenever they park. Follow your specific vehicle's owner's manual.
Does using the parking brake damage the transmission?
Normally, no. Proper use of the parking brake can actually reduce the load placed on the transmission's parking mechanism when parking on an incline.
Should I use the parking brake with an automatic transmission?
Yes, unless your owner's manual provides a specific alternative procedure. Modern vehicles may automatically engage an electronic parking brake.
Can a parking brake rust if you never use it?
The components can experience corrosion regardless of use, particularly in vehicles exposed to moisture and road salt. Regular use can also reveal mechanical problems that might otherwise remain unnoticed.
Can I use the parking brake on a flat surface?
Yes. For most vehicles, applying the parking brake during normal parking is appropriate.
What happens if my parking brake won't hold the vehicle?
Have it inspected. A parking brake that cannot hold the vehicle properly may have an adjustment, mechanical, electrical, or brake-component problem.
Is an electronic parking brake better than a traditional handbrake?
Not necessarily “better” in every respect. EPBs offer convenience and can integrate with other vehicle systems, but they also contain electronic components and require model-specific diagnostics when faults occur.
Bottom Line: Should You Start Using Your Parking Brake?
Yes—if your vehicle's owner's manual instructs you to do so.
Never using your parking brake doesn't automatically mean your car is being damaged.
But there is little advantage to avoiding it.
For most American drivers, a good habit is:
Brake pedal → parking brake → Park → turn off the vehicle.
On hills, the parking brake becomes even more important because it helps secure the vehicle and can reduce the load placed on the transmission's parking mechanism.
And if your car has an Electronic Parking Brake, don't assume that the button works exactly like another manufacturer's system. Some vehicles automatically apply the EPB, while others require manual activation.
The safest rule is simple:
Use the parking brake as directed by your vehicle manufacturer, and investigate any change in how it engages, releases, or holds the vehicle.
Sources & References
National Highway Traffic Safety Administration (NHTSA) — Federal Motor Vehicle Safety Standard No. 135 and parking-brake requirements. NHTSA – Parking Brake Interpretation
NHTSA — 2024 interpretation concerning electronic parking-brake indicators and automatic EPB engagement. NHTSA – Electronic Parking Brake Indicator Interpretation
Ford Motor Company — U.S. owner-manual information recommending application of the parking brake whenever the vehicle is parked. Ford Owner's Manual – Parking Brake
Toyota — Owner-manual guidance on parking brakes, slopes, and wheel blocks. Toyota Owner's Manual
Jeep — Owner-manual guidance on parking brakes, Park position, and parking on hills. 2026 Jeep Wrangler Owner's Manual
Chrysler — Owner-manual warning not to use Park as a substitute for the parking brake. Chrysler Pacifica Owner's Manual
Disclaimer
This article is for general educational purposes and is not a substitute for the owner's manual or professional automotive inspection. Parking-brake design and operating procedures vary by vehicle make, model, year, and drivetrain. Always follow the manufacturer's instructions for your specific vehicle.
About the Author
David Mulyana is the founder and editor of AutoReviewUS, an independent automotive publication dedicated to delivering reliable reviews, industry news, buying guides, and expert insights. His work focuses on cars, motorcycles, electric vehicles (EVs), automotive technology, maintenance, and market trends in the United States and around the world.
With a strong passion for the automotive industry and digital publishing, David creates content that helps readers make informed decisions when buying, maintaining, or comparing vehicles. Every article is researched using trusted manufacturer information, industry reports, and reputable automotive sources to ensure accuracy and relevance.
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