Skip the auto shop - Our mechanics make house calls

How to Replace a Brake Booster Vacuum Sensor

common brake booster vacuum sensor

The brake booster vacuum pressure sensor is found in most vehicles equipped with an electric or engine-driven vacuum pump. This sensor monitors vacuum levels to the brake booster to ensure proper power brake operation. The sensor is typically located in the vacuum line from the vacuum pump to the brake booster.

If vacuum levels fall or if the vacuum pressure sensor fails, your car can have an illuminated Check Engine Light and/or a hard brake pedal. Since the brake system on your car is vital for your safety, ensure that you get this issue fixed as soon as possible.

Part 1 of 2: Locate the vacuum pressure sensor

Materials Needed

typical brake booster vacuum hose

Step 1: Determine the location of the vacuum brake pressure sensor. Usually, the vacuum pressure sensor is located in the vacuum line to the brake booster. However, the vacuum line may not be directly visible in front of the brake booster as it may run behind and/or under the windshield cowl.

Verify the sensor location for your specific vehicle before you begin or attempt the replacement.

typical vacuum sensor location

Step 2: Remove the pressure sensor. Once you locate the sensor, remove any trim pieces and brackets that may be present so that you can access the pressure sensor. After you gain access, use the appropriate pliers to remove the hose clamps and then pry the vacuum sensor from the vacuum hose.

Step 3: Install the new sensor. Once the old sensor is removed, you can install the new one.

Ensure that you replace and tighten the clamps that were removed earlier. Also, put back any other components and trim panels that may have been removed to access the vacuum sensor.

Part 2 of 2: Check the brakes

Step 1: Turn on your vehicle. Start the vehicle and allow the vacuum pressure to build back up in the brake booster.

Step 2: Check the vacuum. Depress the brake pedal a few times to verify whether you have vacuum assist.

Sometimes, simply replacing a faulty component may not automatically reset any warning lights that are present. If any warning lights remain illuminated, you may need to visit a local repair facility or auto part store to clear and reset the system.

If you are unsure about performing this process on your own, get one of the mobile technicians from YourMechanic to come to your home or office and replace your vehicle’s vacuum booster sensor.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...
How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...


Related questions

Q: Fuel tank pressure sensor is bad. How do I check it?

Test the fuel rail pressure sensor, using a digital volt ohmmeter, as the engine is running. The meter should have a reading of 5-volts. If there is a 5 volt reading, then check the ground wire for a low resistance....

Q: Engine Light On - System Too Lean.

Hi there. Check the mass air flow sensor (MAF) and see if it got unplugged. When the oil change was done, most likely the air filter was checked and the MAF sensor was disturbed. Also, check all of the vacuum...

Q: High idling - 1993 Oldsmobile Delta 88

Hi there. The high idle could be caused by a dirty/failed idle air control valve, a dirty throttle body/throttle plate, or vacuum leaks in the engine's intake system. To have the problem scoped out, a certified professional from YourMechanic can...