What is the EPB on a Lexus?
The EPB on a Lexus is the electronic parking brake, a switch-operated system that clamps the rear brakes to hold the car in place, replacing a traditional handbrake lever.
Overview: how the EPB fits in Lexus braking
In contemporary Lexus vehicles, the electronic parking brake (EPB) is integrated into the braking system and controlled by an electronic control unit. It works alongside features like Auto Hold to provide a convenient way to keep the car stationary on hills and during stops, and it can release automatically when you begin to move.
How the EPB works
The EPB uses an electric motor and actuator connected to the rear brake calipers or a dedicated parking brake mechanism. When you engage the EPB, the system applies the rear brakes to lock the wheels. The control unit coordinates with other safety systems (such as ABS and stability control) for smooth operation. On many Lexus models, Auto Hold can keep the vehicle in place after you release the brake pedal, and the brakes may release automatically when you press the accelerator.
Key elements of the EPB system include the following:
- Electronic switch: A button or switch (often labeled with a P symbol) that engages the parking brake.
- Electronic control unit: Manages actuation and communicates with other braking and safety systems.
- Rear braking mechanism: Calipers or a dedicated parking brake mechanism actuated by an electric motor.
- Auto Hold and auto-release features: Optional convenience functions that can hold position and release when moving again.
These components together provide a debounce-free, electronic method of parking, with added convenience and safety features, though they rely on a healthy electrical system.
How to use the EPB
To engage or release the EPB on most Lexus models, follow the steps below. Note that specifics can vary by year and model, so always consult the owner's manual for your car.
- Come to a complete stop and keep your foot on the brake pedal.
- Press the EPB switch or button (often labeled P or with the electronic brake symbol) to engage the parking brake.
- Allow the system to clamp the rear brakes; you may feel or hear a small actuation as it engages.
- To move again, either press the accelerator or toggle the EPB switch to release. In many models, the system will auto-release when you begin to drive in Park/Drive or Reverse, if auto-release is enabled.
When Auto Hold is active, you can lift your foot from the brake pedal and the vehicle will stay stationary until you press the accelerator, reducing pedal effort in stop-and-go traffic or on hills.
Safety, maintenance and warning notes
The EPB is designed to be low-maintenance, but you should treat any warning light or fault as a signal to have the system inspected. A weak 12-volt battery or electrical fault can affect engagement or release, and a persistent EPB warning should prompt a dealer visit.
- Warning lights: If the EPB light or a related brake warning appears, stop safely and check the system as advised in the owner's manual or seek service.
- Battery health: A weak battery can prevent proper engagement/release; ensure the 12-volt system is in good condition.
- Fault scenarios: If the brake cannot be released or remains engaged, do not drive aggressively; consult roadside assistance or a Lexus service center.
In some failure scenarios, a manual release procedure or service intervention may be required. Always refer to your specific model’s manual for the exact steps and locations of any manual release mechanisms.
Manual release and roadside considerations
Some Lexus models provide a manual release option for the EPB in case of power loss or system fault. The location and method vary by model-year, so you should locate the manual release point in your owner's manual and, if needed, have a technician perform the release or towing. If you’re unsure, contact roadside assistance rather than attempting improvisational repairs.
Summary
The electronic parking brake (EPB) on a Lexus replaces the traditional handbrake with an electronic switch that actuates the rear brakes. It often works with Auto Hold to keep the car stationary without keeping your foot on the brake and can auto-release as you start to move. While convenient, it relies on a healthy electrical system, so observe warning indicators and consult the manual or a dealer if you notice any faults.
What is the EPB warning light on a Lexus?
And Lexus vehicles in auto mode. It will not use the battery to engage. And disengage. And will work only when the engine is on. So when you shift to park and immediately shut down your car.
Is it okay to drive with an EPB light on?
If the Parking Brake warning light is still on even though the EPB has been released, we recommend that your vehicle be inspected by an authorized HYUNDAI dealer. Do not drive your vehicle with EPB applied. It may cause excessive brake pad and brake rotor wear.
What causes the EPB light to come on?
Your EPB (Electronic Parking Brake) light is on due to a malfunction in the parking brake system, which can be caused by a low battery, faulty EPB switch, blown fuse, or a problem with the parking brake motor or actuator. You should first ensure the parking brake is fully released and check for obvious issues like a weak battery, but if the light stays on, it's best to have a mechanic diagnose the problem.
Immediate checks and actions
- Release the parking brake: Make sure the parking brake is completely disengaged. It's a common reason for the light to stay on.
- Restart the engine: Turn the car off and then restart it after a few minutes. This can sometimes reset the system and turn the light off.
- Check your battery: A weak battery can trigger this warning light. Ensure your battery is fully charged and healthy.
Potential causes
- Faulty EPB switch: The switch itself could be broken, loose, or unresponsive.
- Blown fuse: Check the fuse box for a blown fuse related to the parking brake system.
- Defective motor/actuator: A common cause is a problem with the motor in the caliper that applies the brake. This can sometimes be accompanied by a buzzing noise.
- Wiring issues: Corroded connectors or damaged wiring can cause a fault.
- Low brake fluid: In some cases, low brake fluid can also trigger the light.
Next steps
- Use a diagnostic scanner: A professional or a personal scan tool can pull error codes from the computer, which will provide more specific information about the problem.
- Visit a mechanic: If the simple fixes don't work, take your car to a professional to have the system inspected and repaired, especially if the light is still on or blinking.
- Use caution: If the light stays on after trying these steps, drive with caution, as there may be a serious issue with your brake system. It's best to get it checked as soon as possible.
How do you reset the EPB on a Lexus?
First, you'll need to disconnect the battery, then while it's disconnected, press the parking brake button and the brake pedal simultaneously. After that, reconnect the battery and wait about five minutes before turning the ignition back on.
