Why Doesn’t My Parking Brake Work? Get to the Root of the Problem

Your parking brake, also known as an emergency brake, is a crucial safety feature that prevents your vehicle from rolling when parked. However, if your parking brake fails to engage or hold, it can be a major safety hazard. In this comprehensive guide, we’ll explore the various reasons why your parking brake might not be working and provide solutions to fix the issue.

Common Causes of Parking Brake Failure

1. Worn or Broken Brake Shoes

The brake shoes are the components that make contact with the brake drums or rotors to create friction and stop the vehicle. Over time, these shoes can wear down or become damaged, reducing their effectiveness.

2. Faulty Brake Cable

The brake cable connects the parking brake lever to the brake shoes. If the cable is frayed, rusted, or disconnected, it can prevent the parking brake from engaging properly.

3. Frozen or Corroded Brake Components

Moisture and road salt can cause the brake components, such as the calipers, pads, or rotors, to freeze or corrode. This can prevent the parking brake from engaging or releasing smoothly.

4. Brake Fluid Leaks

Brake fluid is essential for transmitting hydraulic pressure to the brake components. If there is a leak in the brake fluid system, it can reduce the pressure needed to engage the parking brake.

5. Faulty Parking Brake Lever

The parking brake lever is used to engage and release the parking brake. If the lever is loose, damaged, or misaligned, it may not be able to activate the parking brake properly.

6. Electrical Problems

Some vehicles have electronic parking brakes that use sensors and actuators to engage the brakes. If there is a problem with the electrical system, such as a faulty sensor or a blown fuse, the parking brake may not work.

7. Incorrect Adjustment

The parking brake needs to be properly adjusted to ensure that it engages fully and holds the vehicle securely. If the adjustment is incorrect, the parking brake may not be able to hold the vehicle in place.

How to Diagnose and Fix a Parking Brake Problem

1. Check the Brake Fluid Level

Start by checking the brake fluid level in the master cylinder. If the level is low, it could indicate a leak in the system that needs to be addressed.

2. Inspect the Brake Shoes

Remove the brake drum or caliper to inspect the brake shoes. Look for signs of wear or damage, such as uneven wear, cracks, or glazing. If the shoes need to be replaced, do so in pairs.

3. Examine the Brake Cable

Check the brake cable for any signs of damage, such as fraying, rust, or disconnection. If the cable is damaged, it should be replaced.

4. Test the Parking Brake Lever

Engage and release the parking brake lever several times to check its operation. If the lever feels loose or does not fully engage, it may need to be adjusted or replaced.

5. Inspect for Corrosion or Freezing

Check the brake components for any signs of corrosion or freezing. If there is any rust or ice buildup, try to remove it by cleaning or applying a penetrating lubricant.

6. Check the Electrical System

If your vehicle has an electronic parking brake, check the electrical connections, sensors, and actuators. Use a multimeter to test for continuity and voltage to identify any potential electrical problems.

7. Adjust the Parking Brake

Once you have identified and fixed the cause of the parking brake failure, you may need to adjust the parking brake to ensure proper engagement. Refer to your vehicle’s service manual for specific adjustment procedures.

Importance of a Functional Parking Brake

A functioning parking brake is essential for the following reasons:

• Prevents the vehicle from rolling when parked on an incline
• Acts as an emergency brake in the event of a brake system failure
• Reduces wear and tear on the transmission and other components
• Enhances overall safety and peace of mind

Tips for Maintaining a Healthy Parking Brake

To keep your parking brake in good working condition, follow these tips:

• Use the parking brake regularly, even when parking on level ground.
• Inspect the brake components periodically for wear or damage.
• Lubricate the parking brake cable and pivot points as recommended by the manufacturer.
• Have the parking brake adjusted or repaired as needed by a qualified mechanic.

Answers to Your Most Common Questions

Q: What are the signs of a failing parking brake?

A: Signs of a failing parking brake include: difficulty engaging or releasing the brake, the vehicle rolling when parked on an incline, or a spongy or loose brake lever.

Q: How often should I have my parking brake inspected?

A: It is recommended to have your parking brake inspected every 12,000 to 15,000 miles or as specified in your vehicle’s service manual.

Q: Is it safe to drive with a faulty parking brake?

A: Driving with a faulty parking brake is not advisable. It can increase the risk of the vehicle rolling when parked or failing to stop in an emergency.