A parking brake on a Jeep Grand Cherokee keeps the vehicle from rolling when parked. You set it with a pedal located to the left of the brake pedal.
Press it down firmly to apply the brake, then pull the release handle above the pedal to let it go. If it won’t hold, the most common cause is a stretched cable or worn rear brake shoes.
You can check whether your model uses a pedal or an electronic switch in your owner’s manual, which you can find through the Mopar website.
Why your parking brake won’t hold
The parking brake system on your Jeep Grand Cherokee relies on a steel cable running from the pedal assembly to the rear parking brake shoes located inside the rear brake rotors. Over time, that cable stretches, meaning the pedal no longer pulls with enough force to seat the shoes firmly against the inner drum surface.
If your pedal travels to the floor without resistance, the cable has likely lost its tension. You can test this by jacking up the rear of the vehicle and attempting to spin the wheels while the brake is engaged.
If the wheels rotate freely, the cable or the star-wheel adjuster is failing.
The brake shoes themselves also wear thin, losing the friction material required to hold the vehicle on an incline. If you hear a grinding noise while driving, the parking brake shoes may be dragging due to weak return springs that no longer retract the shoes fully.
Moisture and road salt frequently corrode the cable housing. This causes the internal cable to bind inside its sheath rather than sliding freely.
If you notice the pedal feels stiff or doesn’t return to the top position, the housing is likely compromised.
Avoid the common mistake of simply tightening the adjuster nut at the pedal to compensate for a seized cable. This places excessive stress on the linkage and often causes the cable to snap entirely.
If the pedal feels spongy, replace the cable assembly. If the pedal is firm but the vehicle still rolls, focus on the rear shoe adjustment.
Adjust the Jeep Grand Cherokee parking brake
This fix is for a Grand Cherokee whose parking brake pedal travels too far before it holds. You need a 10 millimeter wrench and access to the equalizer nut under the vehicle, near the rear axle.
Block the front wheels, release the parking brake, and raise the rear of the vehicle on jack stands.
Find the cable adjustment nut and turn it until the rear wheels just begin to drag when turned by hand, then back it off one turn so the wheels spin freely. Lower the vehicle and test the pedal; it should click three to six times before holding firm on a flat surface.
If you feel the pedal hit the floorboard before the vehicle is secure, your shoes are likely worn past the point of adjustment. In this case, turning the nut further only masks the underlying mechanical failure.
You must pull the rear rotors to inspect the internal parking brake shoes for glazing or thin friction material.
If the cable is corroded or frayed, adjustment won’t fix it, and you need new cables rather than more turns on the nut. Inspect the cable housing for cracks where moisture enters and seizes the internal wire.
If the cable doesn’t slide smoothly when you pull it by hand, replace the assembly immediately to prevent the brake from dragging while you drive.
A brake technician should handle this if you have never worked under a vehicle, because jack stands must support the vehicle correctly or it can fall. Always verify the vehicle is stable by pushing on the bumper before sliding underneath.
If the equalizer nut is rusted solid, apply penetrating oil and let it soak for an hour before applying torque to avoid snapping the threaded rod.
Replace the Rear Brake Shoes
This fix is for a Grand Cherokee whose rear brake shoes are worn past their limit or contaminated with oil. You remove the rear wheel and brake drum, then unhook the old shoes from the backing plate and install new ones with the parking brake lever attached.
Reinstall the drum, adjust the star wheel until the drum just drags, and test the pedal travel. This is a different lever than cable adjustment because it replaces the friction material itself rather than tightening what pulls it.
The job takes about an hour per side with basic hand tools. Brake dust can irritate your lungs, so wear a mask and don’t blow it out with compressed air.
If the drum’s inner surface shows deep grooves or blue heat spots, the friction material will fail to seat properly. In this case, you must have the drums turned at a machine shop or replace them entirely.
Check the rear brake components for signs of fluid leaks before you finish.
If you find oil, you must replace the axle seal and the contaminated parking brake shoes immediately. A common mistake is installing new shoes over a leaking seal, which ruins the friction material within a few miles.
If the parking brake pedal still hits the floor after adjustment, check the equalizer under the vehicle. If the cable is frayed, tightening the star wheel will only snap the cable.
Replace the parking brake cables
This is the fix for the harder cases, when the cable is stretched beyond adjustment, frayed, or seized inside its housing. New cables restore full pull from the pedal to the rear brakes, but the job costs more in parts and time than a simple adjustment.
You raise and support the vehicle, remove the wheels and drums, unhook the old cables at the equalizer and brake backing plates, and route the new ones through the same clips and grommets. It’s worth doing when both cables bind or show rust; it isn’t worth doing if only the pedal return spring is weak, because that’s an inexpensive part.
Check the parking brake pedal assembly before buying new cables. If the pedal clicks but fails to hold tension, the internal ratchet mechanism has likely failed.
Replacing the cable won’t fix a stripped gear inside the pedal housing.
Always replace the cables in pairs. If the driver-side cable has seized from road salt or moisture, the passenger-side cable is usually only a few thousand miles behind it.
Replacing just one side creates uneven tension, which causes the Jeep to pull to one side when the brake is engaged.
This work requires being under a supported vehicle and handling brake components. A repair shop should do it unless you have done brake work before and trust your jack stands.
Ensure the parking brake is fully released before disconnecting the equalizer, or the tension may snap the cable ends against your hands. Use a penetrating oil on the backing plate mounting bolts twenty minutes before starting to prevent snapping the rusted fasteners.
Parking brake advice that doesn’t work
Pulling the release handle while driving to free a stuck brake can snap the cable or damage the rear brakes. You should stop the Jeep Grand Cherokee immediately and let the system cool down.
If the brake remains seized, the issue is likely a frozen cable housing rather than a mechanical jam.
Spraying oil or grease on the cable to make it slide better creates a trap for road debris. Lubricant attracts grit and eventually contaminates the internal brake shoes.
This buildup reduces your stopping power and creates a slick surface that prevents the shoes from gripping the drum properly.
Tightening the adjustment nut until the wheels lock when you turn them by hand is a common error. This keeps the brakes partially applied even when the lever is down.
The resulting friction overheats the components, which wears the shoes out in a few hundred miles and can warp the internal drum surface.
Ignoring a parking brake that rolls on a flat surface is dangerous. A brake that fails to hold means the vehicle can move while parked, placing excessive stress on the transmission parking pawl.
If you find your Jeep rolling, test the tension by pulling the handle five clicks.
If the vehicle moves, the cable has stretched beyond its adjustment limit and requires a full replacement rather than a simple tightening. This prevents the costly risk of a runaway vehicle in your driveway or on a steep incline.
Keep your parking brake working
| If you’re doing this | Do this instead | Why |
|---|---|---|
| Parking on a hill without the brake | Always set the brake before shifting to park | The transmission parking pawl isn’t meant to hold the full weight on a slope |
| Driving with the brake partly on | Release it fully before you drive | It overheats the rear brakes and wears the shoes |
| Waiting until the pedal hits the floor | Have it checked when travel feels longer | A stretched cable gives warning before it fails completely |
| Using the brake to stop while driving | Use the regular brake pedal | The parking brake only acts on the rear wheels and can lock them |
| Leaving the vehicle in neutral | Leave it in park or first gear with the brake set | The brake alone may not hold on a steep grade |
Frequently asked questions
How do I release the parking brake on a Jeep Grand Cherokee?
Pull the release handle located above the parking brake pedal on the lower left side of the dashboard. The pedal will pop back up when the brake is fully released.
On models with an electronic parking brake, press the switch again to disengage it.
Can I drive with the parking brake light on?
No. The light means the brake is applied or the system detects a fault.
Driving any distance with the brake on overheats the rear brakes and can ruin the shoes or drums.
How long do parking brake cables last?
There’s no set mileage because life depends on road salt, moisture, and use. Inspect them during regular brake service, and replace them if they’re frayed, corroded, or no longer hold adjustment.
Is it safe to adjust the parking brake myself?
Yes, if you can safely raise and support the vehicle on jack stands and you understand brake hardware. If you have never worked under a vehicle, have a brake shop do it instead.
What happens if the parking brake won’t hold?
The vehicle can roll while parked, especially on a slope. Set the brake every time, leave the transmission in park or first gear, and have the system inspected before you rely on it again.
Conclusion
If your vehicle still rolls after you’ve adjusted the system, it’s time to visit a trusted mechanic for a professional inspection. Don’t ignore these warning signs, as a failing brake could lead to a dangerous accident.
They’ll quickly spot any hidden damage and ensure your SUV stays safely in place every time.
