How to Bypass the Brake Fluid Sensor?

The brake fluid sensor plays a crucial role in monitoring brake fluid levels and warning drivers of any potential issues. However, you may be wondering if it’s possible to bypass this sensor and what methods can be used.

Understanding Brake Fluid Sensors

The brake fluid sensor, also known as the brake fluid level switch, is located on the brake master cylinder reservoir. It monitors the level of brake fluid and sends signals to activate the brake warning light on your dashboard if levels get too low.

Low brake fluid levels can severely impact braking performance and road safety. The sensor alerts you in advance, so you can take action and avoid driving with compromised braking ability.

Symptoms of a faulty brake fluid sensor include:

  • Brake warning light illuminated on dashboard
  • Inaccurate or fluctuating readings
  • No activation of warning light
  • Delayed or intermittent activation
  • Sensor sticking or getting stuck
  • Brake pedal feels soft or spongy

Why Bypass the Brake Fluid Sensor?

There are some situations where you may consider bypassing the brake fluid sensor:

  • Faulty sensor – If the sensor is malfunctioning and giving false readings, you may want to bypass it temporarily until you can replace it.
  • DIY brake work – When working on your own brakes, you may disconnect the sensor to avoid triggering false warnings.
  • Disable warning light – Some people choose to disable the low brake fluid warning light, especially if it is coming on erratically.

However, bypassing this sensor has serious safety risks and is generally not recommended.

Method 1: Disconnecting the Sensor

One way to bypass the brake fluid sensor is by disconnecting it. Here are the steps:

What You’ll Need

  • Ratchet set
  • Socket set
  • Flat head screwdriver


  1. Locate the brake fluid reservoir under the hood. The sensor will be mounted on top, connected by an electrical connector.
  2. Use the screwdriver to gently pry and release the locking tabs on the sensor connector.
  3. Disconnect the sensor electrical connector. This will disable the sensor and warning light.
  4. Reinstall any brackets or screws that were removed to access the connector.

With the sensor disconnected, the brake warning light will remain off even with low fluid levels. You’ll have to manually check the reservoir regularly.

Method 2: Shorting the Sensor Wires

You can also bypass the brake fluid sensor by shorting or bridging the wires that connect to it:

What You’ll Need

  • Wire strippers
  • Jumper wire


  1. Locate the sensor wiring and connector.
  2. Use wire strippers to remove about 0.5″ of insulation from the ends of the two wires.
  3. Connect the exposed wires using a jumper wire. This shorts the circuit and simulates normal fluid levels.
  4. Wrap electrical tape around the connection to prevent shorts.

Similar to disconnecting, this bypass will keep the warning light off. Be sure to inspect reservoir levels manually.

Dangers of Bypassing the Sensor

While bypassing the brake fluid sensor may seem straightforward, it comes with serious safety hazards:

  • You lose the sensor’s early warning for low fluid levels.
  • Driving with inadequate brake fluid can severely reduce braking power.
  • Brake failure and collisions become more likely with compromised fluid levels.
  • Manually checking the reservoir is easy to forget or overlook.
  • The brake warning light being off gives a false sense of security.

Bypassing this vital safety sensor is strongly discouraged. Make sure brake fluid is at the proper level before driving if you do bypass the sensor temporarily.

Maintaining Your Brake Fluid Sensor

Instead of bypassing it, keep your brake fluid sensor in good working order:

  • Check for leaks and moisture buildup on the reservoir that can damage the sensor.
  • Ensure the sensor screws and connector are tight and corrosion-free.
  • Replace the sensor immediately if it is cracked, giving false readings, or no longer triggering the warning light.
  • Flush the brake lines and replace fluid per manufacturer service schedule.

Proper brake fluid sensor operation is crucial for safe braking and preventing accidents. Address any issues promptly before resorting to bypassing it.

FAQs About Bypassing Brake Sensors

Can I just unplug the sensor and leave it?

While unplugging the sensor is one bypass method, leaving it unplugged permanently is not advised. You’ll lose all warnings and put safety at risk.

Will shorting the sensor wires damage anything?

If done correctly, shorting the wires just bypasses the sensor signal. It won’t directly damage components. But driving without proper brake fluid level warnings can lead to brake failure.

Does disabling the warning light fool cops?

No, police can still cite you for unsafe vehicles, including low brake fluid. The sensor should only be temporarily bypassed when absolutely needed.

Can I drive without any brake fluid at all?

Absolutely not! Driving without brake fluid will make it impossible to stop and lead to a serious crash. Never drive if the brake pedal feels soft or goes to the floor.

How long can I safely drive with the sensor bypassed?

You should only bypass the sensor out of necessity and for very short periods. The risks compound quickly the more you drive without proper brake fluid warnings.


The brake fluid sensor provides vital safety alerts that help prevent brake failure and accidents. While there are methods to bypass the sensor, doing so is strongly discouraged except for temporary repairs. Ensure proper brake fluid levels manually if bypassing, and address any sensor issues promptly. Prioritize road safety by keeping your braking system in optimal condition.

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