How Do I Exit Subaru Brake Maintenance Mode?

Subaru Brake Maintenance Mode is crucial for safely servicing your vehicle’s electronic parking brake (EPB) system. If you are experiencing difficulties exiting brake maintenance mode after a brake job, CAR-TOOL.EDU.VN can provide expert guidance and troubleshooting tips to resolve the issue and ensure your Subaru’s braking system functions correctly. Our comprehensive resources cover various Subaru models and address common problems encountered during brake maintenance, including EPB reset procedures and diagnostic solutions, which enhances overall brake performance.

1. What is Subaru Brake Maintenance Mode and Why is it Important?

Subaru brake maintenance mode is a diagnostic setting that retracts the electronic parking brake (EPB) to allow for safe and effective brake pad and rotor replacement. According to Subaru’s service guidelines, engaging brake maintenance mode prevents the EPB from automatically activating during servicing, which could cause injury or damage to the braking system. Activating this mode is crucial for any brake job on vehicles equipped with an EPB.

1.1. Understanding the Purpose of Brake Maintenance Mode

Brake maintenance mode serves to protect both the technician and the vehicle during brake service. When activated, it electronically disengages the rear brakes, preventing them from clamping down while you’re working. This is especially important in vehicles with electronic parking brakes, where the system is computer-controlled. By retracting the EPB, technicians can safely compress the caliper pistons, remove the old brake pads, and install new ones without resistance or risk of accidental activation.

1.2. Models That Require Brake Maintenance Mode

Subaru models equipped with an electronic parking brake (EPB) typically require the use of brake maintenance mode during brake service. These models often include:

• Subaru Outback (2015-present)
• Subaru Legacy (2015-present)
• Subaru Forester (2019-present)
• Subaru Ascent (All years)
• Subaru Impreza (2017-present)
• Subaru Crosstrek (2018-present)

Always consult your vehicle’s service manual to confirm whether brake maintenance mode is required for your specific model and year.

1.3. Risks of Not Using Brake Maintenance Mode

Failure to engage brake maintenance mode before servicing the brakes on an EPB-equipped Subaru can lead to several risks:

• Damage to EPB Actuators: Attempting to force the caliper pistons back without retracting the EPB can damage the actuators, which are responsible for applying and releasing the parking brake.
• Injury: The EPB could activate unexpectedly during the service, causing the brakes to clamp down and potentially injure the technician.
• System Errors: The vehicle’s computer may detect a fault in the EPB system, leading to warning lights on the dashboard and potentially requiring a diagnostic reset at the dealership.

According to a study by the National Highway Traffic Safety Administration (NHTSA), improper brake maintenance is a significant factor in vehicle accidents, highlighting the importance of following proper procedures, including the use of brake maintenance mode.

2. How to Enter Subaru Brake Maintenance Mode

The process for entering Subaru brake maintenance mode typically involves using a diagnostic scan tool capable of communicating with the vehicle’s EPB system. Ensure your scan tool is updated with the latest software to accurately interface with your Subaru model.

2.1. Step-by-Step Guide Using a Scan Tool

1. Connect the Scan Tool: Plug your scan tool into the OBD-II port, usually located under the dashboard on the driver’s side.
2. Turn on the Ignition: Turn the ignition to the “ON” position without starting the engine.
3. Navigate to EPB Menu: Use the scan tool to navigate to the EPB or Brake System menu. This might be under “Chassis,” “Brakes,” or a similar category.
4. Select Maintenance Mode: Look for an option like “EPB Maintenance Mode,” “Service Mode,” or “Retract Calipers.”
5. Follow On-Screen Prompts: The scan tool will provide step-by-step instructions. This usually involves confirming your intent to enter maintenance mode and may require pressing the brake pedal.
6. Verify Activation: Once completed, the scan tool should indicate that the EPB is in maintenance mode. You may also hear the EPB motors retract.

2.2. Alternative Methods (If Scan Tool is Unavailable)

While using a scan tool is the recommended method, some Subaru models may have alternative procedures for entering brake maintenance mode without a scan tool. These methods often involve a specific sequence of actions with the ignition, parking brake switch, and brake pedal.

• Consult the Service Manual: Check your vehicle’s service manual for any alternative procedures specific to your model.
• Online Forums: Search online Subaru forums for model-specific instructions shared by other owners and technicians.

Caution: Alternative methods can be risky if not performed correctly. Always prioritize using a scan tool when possible.

2.3. Common Mistakes to Avoid

• Incorrect Scan Tool: Ensure your scan tool is compatible with Subaru vehicles and supports EPB functions.
• Outdated Software: Update your scan tool’s software to ensure it has the latest protocols and data for your Subaru model.
• Skipping Steps: Carefully follow the on-screen prompts provided by the scan tool. Skipping steps can lead to errors or failure to enter maintenance mode.

3. Common Problems Encountered When Exiting Brake Maintenance Mode

Several issues can arise when attempting to exit Subaru brake maintenance mode. These problems can range from scan tool errors to mechanical issues with the EPB system.

3.1. “No Brake Pressure Detected” Error

One common error is “No Brake Pressure Detected,” which can occur when the scan tool fails to recognize adequate brake pedal input during the exit procedure.

• Possible Causes:
  • Faulty Brake Pedal Sensor: The brake pedal sensor may not be accurately detecting the pedal’s position.
  • Air in Brake Lines: Air in the brake lines can reduce brake pressure.
  • Scan Tool Glitch: Occasionally, the scan tool itself may be the source of the error.
• Troubleshooting Steps:
  1. Check Brake Fluid Level: Ensure the brake fluid reservoir is filled to the appropriate level.
  2. Bleed Brakes: Bleed the brake lines to remove any air.
  3. Verify Brake Pedal Sensor: Use the scan tool to monitor the brake pedal sensor’s output while pressing the pedal.
  4. Restart Procedure: Try restarting the exit procedure from the beginning, ensuring firm and consistent pressure on the brake pedal.

3.2. Procedure Quits During the 7-Second Pedal Press

Another issue is when the exit procedure abruptly quits during the step that requires pressing the brake pedal for seven seconds.

• Possible Causes:
  • Inconsistent Pedal Pressure: Maintaining consistent pressure on the brake pedal for the entire duration is crucial.
  • Electrical Interference: Electrical interference can disrupt the communication between the scan tool and the vehicle’s computer.
  • Low Battery Voltage: Low battery voltage can affect the performance of the EPB system.
• Troubleshooting Steps:
  1. Steady Pedal Pressure: Focus on maintaining firm, consistent pressure on the brake pedal for the full seven seconds.
  2. Minimize Electrical Load: Turn off any unnecessary electrical accessories (e.g., headlights, radio) to reduce electrical load.
  3. Check Battery Voltage: Ensure the vehicle’s battery is fully charged and in good condition.
  4. Try a Different Scan Tool: If possible, try using a different scan tool to rule out any issues with the tool itself.

3.3. EPB System Remains in Maintenance Mode

Sometimes, even after completing the exit procedure, the EPB system may remain in maintenance mode. This is typically indicated by a warning light on the dashboard.

• Possible Causes:
  • Procedure Not Completed Successfully: The exit procedure may not have been fully completed due to an error or interruption.
  • EPB Actuator Issues: There may be an underlying issue with the EPB actuators themselves.
  • Fault Codes: The system may have stored fault codes that need to be cleared.
• Troubleshooting Steps:
  1. Repeat Exit Procedure: Try repeating the exit procedure from the beginning.
  2. Check for Fault Codes: Use the scan tool to check for any stored fault codes in the EPB system. Clear any codes that are present.
  3. Inspect EPB Actuators: Inspect the EPB actuators for any signs of damage or malfunction.
  4. Consult a Professional: If the problem persists, consult a qualified technician for further diagnosis.

4. Detailed Troubleshooting Steps to Resolve Exit Issues

When encountering issues while exiting Subaru brake maintenance mode, systematically troubleshooting the problem can save time and prevent further complications.

4.1. Verifying Brake Pedal Sensor Functionality

The brake pedal sensor plays a critical role in the EPB system’s operation. If the sensor is not functioning correctly, it can prevent the system from exiting maintenance mode.

• Using a Scan Tool to Monitor Sensor Output:

  1. Connect your scan tool to the vehicle’s OBD-II port and turn on the ignition.
  2. Navigate to the “Live Data” or “Data Stream” section of the scan tool.
  3. Look for the brake pedal sensor parameter, typically labeled as “Brake Pedal Position,” “Brake Switch,” or similar.
  4. Monitor the sensor’s output while slowly pressing and releasing the brake pedal.
  5. The sensor’s output should change smoothly and proportionally to the pedal’s position. Any erratic or non-linear behavior indicates a problem with the sensor.

• Testing the Sensor with a Multimeter:

  1. Locate the brake pedal sensor, usually mounted near the brake pedal assembly.
  2. Disconnect the sensor’s electrical connector.
  3. Use a multimeter to measure the sensor’s resistance or voltage output according to the vehicle’s service manual.
  4. Compare your readings to the specifications in the service manual. Any significant deviations indicate a faulty sensor.

4.2. Bleeding the Brakes to Remove Air

Air in the brake lines can interfere with the EPB system’s ability to detect brake pressure. Bleeding the brakes is a necessary step to ensure proper hydraulic function.

• Traditional Two-Person Bleeding Method:

  1. Gather your supplies: a wrench to open and close the bleeder screws, a clear hose, a container to collect the old brake fluid, and fresh brake fluid.
  2. Locate the bleeder screws on each brake caliper.
  3. Start with the brake caliper furthest from the master cylinder (usually the right rear).
  4. Attach the clear hose to the bleeder screw and submerge the other end in the container of brake fluid.
  5. Have a helper pump the brake pedal several times and hold it down.
  6. Open the bleeder screw while the pedal is held down. Air and old fluid will flow through the hose.
  7. Close the bleeder screw before your helper releases the brake pedal.
  8. Repeat steps 5-7 until no more air bubbles are visible in the hose.
  9. Move on to the next brake caliper, working your way closer to the master cylinder (left rear, right front, left front).
  10. Check the brake fluid level in the master cylinder regularly and add fresh fluid as needed.

• Using a One-Person Bleeding Kit:

  1. One-person bleeding kits use a check valve to prevent air from flowing back into the brake system.
  2. Follow the kit’s instructions for attaching the hose and opening the bleeder screw.
  3. Pump the brake pedal several times, allowing the check valve to prevent air from re-entering the system.
  4. Close the bleeder screw and move on to the next caliper.

• Pressure Bleeding:

  1. Pressure bleeding uses a tool to apply pressure to the brake fluid reservoir, forcing fluid through the system.
  2. Follow the tool’s instructions for attaching it to the reservoir and setting the appropriate pressure.
  3. Open the bleeder screws one at a time, allowing the old fluid and air to flow out.
  4. Monitor the fluid level in the reservoir and add fluid as needed.

4.3. Inspecting EPB Actuators for Damage

The EPB actuators are responsible for applying and releasing the parking brake. Inspecting them for damage is crucial for resolving exit issues.

• Visual Inspection:

  1. Locate the EPB actuators on the rear brake calipers.
  2. Visually inspect the actuators for any signs of damage, such as cracks, leaks, or corrosion.
  3. Check the electrical connectors for any loose or corroded terminals.

• Testing Actuator Functionality with a Scan Tool:

  1. Use a scan tool to access the EPB system’s diagnostic functions.
  2. Look for options to activate or retract the EPB actuators.
  3. Listen for the actuators to operate smoothly and without unusual noises.
  4. Check for any fault codes related to the actuators.

According to a report by the American Automobile Association (AAA), damaged or malfunctioning EPB actuators are a common cause of brake system issues, underscoring the importance of thorough inspection and testing.

5. Resetting EPB System After Maintenance

After completing brake maintenance and resolving any exit issues, resetting the EPB system is essential to ensure proper operation.

5.1. Using a Scan Tool to Reset the EPB

A scan tool is typically required to properly reset the EPB system after maintenance. The process usually involves clearing any stored fault codes and recalibrating the EPB system.

1. Connect Scan Tool: Plug your scan tool into the OBD-II port and turn the ignition to the “ON” position.
2. Access EPB Menu: Navigate to the EPB or Brake System menu.
3. Clear Fault Codes: Look for an option to “Clear Codes” or “Erase DTCs.” Clear any fault codes related to the EPB system.
4. Perform Calibration: Select the “EPB Calibration” or “EPB Reset” option.
5. Follow On-Screen Prompts: The scan tool will provide step-by-step instructions for calibrating the EPB system. This may involve pressing the brake pedal or operating the parking brake switch.
6. Verify Reset: Once completed, the scan tool should indicate that the EPB system has been successfully reset.

5.2. Manual Reset Procedures (If Available)

Some Subaru models may have manual reset procedures for the EPB system. These procedures typically involve a specific sequence of actions with the ignition, parking brake switch, and brake pedal.

• Consult the Service Manual: Check your vehicle’s service manual for any manual reset procedures specific to your model.
• Online Forums: Search online Subaru forums for model-specific instructions shared by other owners and technicians.

Caution: Manual reset procedures can be risky if not performed correctly. Always prioritize using a scan tool when possible.

5.3. Verifying Proper EPB Operation

After resetting the EPB system, it’s important to verify that it’s functioning correctly.

1. Check for Warning Lights: Ensure that there are no warning lights related to the EPB system on the dashboard.
2. Test Parking Brake Function: Engage and disengage the parking brake several times, ensuring that it operates smoothly and securely.
3. Perform a Road Test: Perform a low-speed road test to verify that the parking brake releases fully and does not drag.

6. What Scan Tools are Recommended for Subaru EPB Systems?

Selecting the right scan tool is crucial for effectively servicing Subaru EPB systems. A capable scan tool should be able to enter and exit brake maintenance mode, clear fault codes, and perform EPB calibrations.

6.1. Top Scan Tool Brands for Subaru Vehicles

• Autel: Autel scan tools, such as the MaxiSYS series, are known for their comprehensive diagnostic capabilities and wide vehicle coverage, including advanced EPB functions for Subaru vehicles.
• Snap-on: Snap-on scan tools are professional-grade tools that offer advanced diagnostics, coding, and programming capabilities. They are widely used by automotive technicians for their reliability and accuracy.
• Launch: Launch scan tools, such as the X431 series, provide a balance of performance and affordability. They offer a wide range of diagnostic functions, including EPB service for Subaru vehicles.
• Foxwell: Foxwell scan tools, like the NT630 Plus, are popular among DIYers and professional technicians for their user-friendly interface and comprehensive diagnostic functions, including EPB service for various Subaru models.

6.2. Key Features to Look For in a Scan Tool

• Subaru-Specific Coverage: Ensure the scan tool supports Subaru vehicles and has specific coverage for EPB systems.
• EPB Functions: The scan tool should be able to enter and exit brake maintenance mode, clear fault codes, and perform EPB calibrations.
• Live Data: The ability to view live data from the EPB system can be helpful for diagnosing issues.
• User-Friendly Interface: A scan tool with an intuitive interface and clear instructions can save time and reduce errors.
• Software Updates: Regular software updates are essential to ensure the scan tool has the latest vehicle coverage and diagnostic capabilities.

6.3. Budget-Friendly Options

For DIYers or technicians on a budget, there are several affordable scan tools that offer basic EPB service functions for Subaru vehicles.

• Foxwell NT630 Plus: A popular choice for its user-friendly interface and comprehensive diagnostic functions.
• iCarsoft CR Pro: Offers good value for its price, with support for EPB service and other diagnostic functions.

However, keep in mind that budget-friendly options may have limited coverage and features compared to professional-grade scan tools.

According to a survey by the Equipment & Tool Institute (ETI), the demand for advanced diagnostic tools is increasing as vehicles become more complex, highlighting the importance of investing in a capable scan tool for servicing modern vehicles.

7. What are the Symptoms of a Faulty EPB System?

Recognizing the symptoms of a faulty EPB system is crucial for timely diagnosis and repair.

7.1. Warning Lights on the Dashboard

One of the most common symptoms of a faulty EPB system is a warning light on the dashboard. The warning light may be specific to the EPB system or a more general brake system warning light.

• EPB Warning Light: This light usually has the shape of a parking brake symbol with the word “BRAKE” or “PARK” in the center.
• ABS Warning Light: The Anti-lock Braking System (ABS) and EPB systems are often linked, so an issue with the EPB system may also trigger the ABS warning light.
• Brake System Warning Light: This light is usually red and has the shape of a circle with an exclamation point inside. It indicates a general issue with the brake system.

7.2. Parking Brake Fails to Engage or Release

Another symptom of a faulty EPB system is when the parking brake fails to engage or release properly.

• Parking Brake Won’t Engage: The parking brake may not engage fully, or it may not engage at all.
• Parking Brake Won’t Release: The parking brake may not release, causing the rear brakes to drag.

7.3. Unusual Noises from the Rear Brakes

Unusual noises from the rear brakes can also indicate a problem with the EPB system.

• Grinding Noises: Grinding noises may indicate worn brake pads or rotors.
• Clicking Noises: Clicking noises may indicate a problem with the EPB actuators.
• Squealing Noises: Squealing noises may indicate worn brake pads or rotors.

7.4. EPB System Operates Erratically

An EPB system that operates erratically can also be a sign of a problem.

• Parking Brake Engages or Releases Unexpectedly: The parking brake may engage or release unexpectedly while driving.
• Parking Brake Operates Slowly or Jerkily: The parking brake may operate slowly or jerkily.

If you notice any of these symptoms, it’s important to have your vehicle inspected by a qualified technician as soon as possible.

8. Preventative Maintenance Tips for Subaru Brake Systems

Preventative maintenance is key to keeping your Subaru’s brake system in top condition and avoiding costly repairs.

8.1. Regular Brake Inspections

Regular brake inspections are essential for identifying potential issues early on.

• Check Brake Pad Thickness: Inspect the brake pads for wear and tear. Replace the brake pads when they reach the minimum thickness specified in the vehicle’s service manual.
• Inspect Brake Rotors: Inspect the brake rotors for cracks, warpage, and excessive wear. Resurface or replace the rotors as needed.
• Check Brake Fluid Level and Condition: Check the brake fluid level in the master cylinder and inspect the fluid for contamination. Replace the brake fluid every two to three years, or as recommended in the vehicle’s service manual.
• Inspect Brake Lines and Hoses: Inspect the brake lines and hoses for leaks, cracks, and corrosion. Replace any damaged lines or hoses.

8.2. Proper Brake Fluid Maintenance

Brake fluid is hygroscopic, meaning it absorbs moisture from the air. Moisture in the brake fluid can lead to corrosion and reduced braking performance.

• Use the Correct Type of Brake Fluid: Use the type of brake fluid specified in the vehicle’s service manual.
• Flush the Brake Fluid Regularly: Flush the brake fluid every two to three years, or as recommended in the vehicle’s service manual.
• Check for Leaks: Regularly check for leaks around the master cylinder, brake calipers, and brake lines.

8.3. Avoiding Hard Braking

Hard braking can put excessive stress on the brake system, leading to premature wear and tear.

• Drive Smoothly: Drive smoothly and avoid sudden acceleration and braking.
• Anticipate Traffic: Anticipate traffic conditions and adjust your speed accordingly.
• Use Engine Braking: Use engine braking to slow down when possible.

Following these preventative maintenance tips can help extend the life of your Subaru’s brake system and ensure safe and reliable braking performance.

9. How to Find Reliable Subaru Parts and Tools at CAR-TOOL.EDU.VN

CAR-TOOL.EDU.VN offers a comprehensive selection of high-quality Subaru parts and tools to meet your automotive repair needs.

9.1. Navigating the CAR-TOOL.EDU.VN Website

CAR-TOOL.EDU.VN provides a user-friendly platform to easily find the parts and tools you need.

• Search Bar: Use the search bar to quickly find specific parts or tools by entering keywords or part numbers.
• Category Navigation: Browse through the website’s category structure to find parts and tools related to specific systems or components.
• Vehicle Selector: Use the vehicle selector to narrow down your search to parts and tools that are compatible with your specific Subaru model and year.

9.2. Finding Specific Parts for Your Subaru Model

CAR-TOOL.EDU.VN offers a wide range of Subaru parts, including:

• Brake Pads and Rotors: Find high-quality brake pads and rotors that are specifically designed for your Subaru model.
• Brake Calipers: Find new or remanufactured brake calipers to replace worn or damaged calipers.
• Brake Lines and Hoses: Find brake lines and hoses that are compatible with your Subaru model.
• EPB Actuators: Find EPB actuators to replace faulty or damaged actuators.

9.3. Choosing the Right Tools for Brake Maintenance

CAR-TOOL.EDU.VN offers a variety of tools for brake maintenance, including:

• Scan Tools: Find scan tools that are capable of entering and exiting brake maintenance mode, clearing fault codes, and performing EPB calibrations.
• Brake Bleeding Kits: Find brake bleeding kits to make brake bleeding easier and more efficient.
• Brake Caliper Tools: Find tools for compressing caliper pistons and removing brake calipers.

CAR-TOOL.EDU.VN is committed to providing high-quality parts and tools at competitive prices. With our extensive selection and user-friendly website, you can easily find everything you need to keep your Subaru’s brake system in top condition.

10. Frequently Asked Questions (FAQ) About Subaru Brake Maintenance Mode

Here are some frequently asked questions about Subaru brake maintenance mode:

10.1. What is the purpose of Subaru brake maintenance mode?

Subaru brake maintenance mode retracts the electronic parking brake (EPB) to allow for safe brake pad and rotor replacement. Engaging this mode prevents the EPB from automatically activating during servicing, which could cause injury or damage.

10.2. Which Subaru models require brake maintenance mode?

Subaru models equipped with an electronic parking brake (EPB) typically require the use of brake maintenance mode during brake service. This includes models like the Outback (2015-present), Legacy (2015-present), and Forester (2019-present).

10.3. Can I enter brake maintenance mode without a scan tool?

While using a scan tool is recommended, some Subaru models may have alternative procedures for entering brake maintenance mode without a scan tool. Consult your vehicle’s service manual or online forums for model-specific instructions.

10.4. What is the “No Brake Pressure Detected” error?

The “No Brake Pressure Detected” error can occur when the scan tool fails to recognize adequate brake pedal input during the exit procedure. This can be caused by a faulty brake pedal sensor, air in the brake lines, or a scan tool glitch.

10.5. How do I troubleshoot the “No Brake Pressure Detected” error?

To troubleshoot this error, check the brake fluid level, bleed the brakes to remove any air, verify the brake pedal sensor, and restart the exit procedure, ensuring firm and consistent pressure on the brake pedal.

10.6. What if the exit procedure quits during the 7-second pedal press?

This issue can occur if you don’t maintain consistent pressure on the brake pedal, due to electrical interference, or low battery voltage. Ensure steady pedal pressure, minimize electrical load, and check battery voltage.

10.7. How do I reset the EPB system after maintenance?

A scan tool is typically required to reset the EPB system after maintenance. This involves clearing any stored fault codes and recalibrating the EPB system.

10.8. What are the symptoms of a faulty EPB system?

Symptoms of a faulty EPB system include warning lights on the dashboard, the parking brake failing to engage or release, unusual noises from the rear brakes, and erratic EPB system operation.

10.9. How often should I inspect my Subaru’s brakes?

Regular brake inspections are essential for identifying potential issues early on. Check brake pad thickness, inspect brake rotors, and check brake fluid level and condition regularly.

10.10. Where can I find reliable Subaru parts and tools?

CAR-TOOL.EDU.VN offers a comprehensive selection of high-quality Subaru parts and tools to meet your automotive repair needs.

By addressing these frequently asked questions, you can gain a better understanding of Subaru brake maintenance mode and how to properly service your vehicle’s brake system.

Do you have more questions or need assistance finding the right parts and tools for your Subaru? Contact us today at 456 Elm Street, Dallas, TX 75201, United States. Whatsapp: +1 (641) 206-8880. Visit our website CAR-TOOL.EDU.VN for expert advice and quality products.