Symptoms of a Bad or Failing Brake Booster Vacuum Sensor

Brake booster vacuum sensors are an electronic component found on many vehicles equipped with vacuum pumps for their brake boosters. They are usually installed in the brake booster and work to monitor the amount of vacuum present inside of the booster. They monitor the vacuum level to ensure that there is always enough vacuum present for the power brakes to operate correctly, and will set off a brake or service booster light when they detect that the vacuum has fallen below acceptable levels.

When they do fail, the computer loses an important signal as the vacuum measured by the brake booster vacuum sensor is what allows the power assisted brakes to work. Usually, a vehicle with a failed brake booster vacuum sensor will produce a few symptoms that can notify the driver of a potential problem that should be serviced.

Stiff brake pedal

One of most commonly associated symptoms of a problem with the brake booster vacuum sensor is a stiff brake pedal. A stiff brake pedal is usually caused by there not being enough vacuum present due to a problem with the brake booster vacuum pump. However, if the pedal become stiff and the brake or service booster light is not illuminated, then that means the sensor is not picking up on the low vacuum levels and may be having a problem.

Illuminated Check Engine Light

Another symptom of a problem with the brake booster vacuum sensor is an illuminated Check Engine Light. If the computer detects a problem with the brake booster vacuum sensor signal or circuit, it will set off the Check Engine Light to alert the driver that a problem has occurred. A Check Engine Light can also be set off by a variety of other problems, so it is important to have the computer scanned for trouble codes before proceeding with any repairs.

The brake booster sensor is an important piece of the braking system for vehicles equipped with brake booster pumps. They monitor an important signal for the vacuum that allows the entire power brake system to work. For this reason, if you suspect that your brake booster may be having a problem, or your Check Engine Light has come on, have the vehicle’s brake system diagnosed by a professional technician, such as one from YourMechanic. They will be able to determine if your car needs a brake booster vacuum sensor replaced, or if another repair is needed to restore functionality to your brake system.


Next Step

Schedule Brake System Inspection

The most popular service booked by readers of this article is Brake System Inspection. Once the problem has been diagnosed, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. YourMechanic’s technicians bring the dealership to you by performing this job at your home or office 7-days a week between 7AM-9PM. We currently cover over 2,000 cities and have 100k+ 5-star reviews... LEARN MORE

SEE PRICING & SCHEDULING

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

Recent Brake System Inspection reviews

Excellent Rating

(258)

Rating Summary
242
8
2
1
5
242
8
2
1
5

Mazyar

8 years of experience
353 reviews
Mazyar
8 years of experience
Nissan Xterra - Brake System Inspection - Lithonia, Georgia
Mark was very professional , told me exactly what my problem was and more I’m very pleased , Thank You Mark
Pontiac Montana - Brake System Inspection - Atlanta, Georgia
Mark was personable. Very professional. I was so impressed that I asked if he could come back to do the follow up when I was ready.

Joel

21 years of experience
984 reviews
Joel
21 years of experience
Chevrolet Silverado 1500 - Brake System Inspection - Jacksonville, Florida
Joel, did a very good job explained everything he was doing answered all my question and was straight forward what he is doing and going to do with fixing my truck
Infiniti G35 - Brake System Inspection - Jacksonville Beach, Florida
Joel was great. Honest fast and professional. He is the automobile maintenance version of the trusted family doctor, attorney etc. Good to have a QB to save time and $pin job at dealership etc!

Benji

22 years of experience
199 reviews
Benji
22 years of experience
Land Rover Range Rover Sport - Brake System Inspection - Phoenix, Arizona
Benji performed a detailed inspection on my 2007 Range Rover and completed the work very quickly. Highly recommend!!
Lincoln MKX - Brake System Inspection - Gilbert, Arizona
Very professional and knowledgeable. Very good business sense and cordial. Thank you for taking care of my car today! ☺

Scott

36 years of experience
802 reviews
Scott
36 years of experience
Chevrolet C10 Pickup - Brake System Inspection - Mesa, Arizona
Scott was on time and knowledgeable. Diagnosed the problem and explained what needed to be done next.

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

Related articles

How Long Does an Air Cleaner Temperature Sensor Last?
An An air cleaner temperature sensor is not overly common on newer vehicles. This is because in order to ensure that your car engine operates the way it should, several electronic sensors may actually be needed. However, if you drive...
How to Replace a Cruise Control Vacuum Bleed Switch
Cruise control slows when the vacuum bleed switch activates. It fails if the cruise control deactivates automatically or will not hold the speed.
How to Break in Brake Pads
Having new brake pads and rotors installed happens on a regular basis. Once those brake pads and rotors are mounted, it is...

Related questions

Was a loud tapping noise while accelerating, and then put in new alternator and got oil change, woke up this morning and want st

You need to look at the oil pressure sending unit just above the oil filter to see if it got damaged when changing the oil filter. If it is the sending unit, then replace it since the fuel pressure will...

Car jerking forward after brake pedal release.

The rear brakes on this car are drum brakes and they may be binding due to the rear wheel brake cylinders binding or the springs are weak and do not return the brakes quick enough. The brakes should be inspected...

Check Engine Light on Dodge Ram 1500 with code P0073

Check the condition of the harness that plugs into the sensor to ensure that the sensor is staying plugged in. If you are saying that the sensor is functioning and the voltage does change, then it is possible that your...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com