Pontiac Grand Prix Hissing noise when brake pedal is depressed Inspection at your home or office.

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Hissing noise when brake pedal is depressed Inspection Service

How much does a Hissing noise when brake pedal is depressed Inspection cost?

On average, the cost for a Pontiac Grand Prix Hissing noise when brake pedal is depressed Inspection is $95 with $0 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
1967 Pontiac Grand PrixV8-6.6LService typeHissing noise when brake pedal is depressed InspectionEstimate$114.99Shop/Dealer Price$124.99 - $132.49
1979 Pontiac Grand PrixV8-5.0LService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$105.01 - $112.52
1999 Pontiac Grand PrixV6-3.1LService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$105.01 - $112.52
1989 Pontiac Grand PrixV6-3.1L TurboService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$104.99 - $112.48
1982 Pontiac Grand PrixV6-3.8LService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$105.02 - $112.55
1983 Pontiac Grand PrixV8-5.0LService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$105.01 - $112.52
1963 Pontiac Grand PrixV8-6.9LService typeHissing noise when brake pedal is depressed InspectionEstimate$99.99Shop/Dealer Price$109.87 - $117.28
2003 Pontiac Grand PrixV6-3.8LService typeHissing noise when brake pedal is depressed InspectionEstimate$99.99Shop/Dealer Price$110.24 - $117.94
Show example Pontiac Grand Prix Hissing noise when brake pedal is depressed Inspection prices

Brakes are the most important safety components on your vehicle. Despite that importance, it’s easy to take them for granted, at least until your car begins to do strange things. Ordinarily, pressing your brake pedal should result in only the car slowing down or stopping. If you hear a hissing noise when the brake pedal is depressed, it may mean there’s something that needs to be repaired in the system.

How this system works:

On many cars, the master cylinder works in tandem with a brake booster. The brake booster is mounted to the firewall, generally in front of the steering wheel position, and the master cylinder attaches to it. The entire point of the brake booster is to make it easier to press the brake pedal and slow or stop the car.

Your brake booster works on vacuum pressure. There’s a diaphragm inside that is responsible for maintaining pressure when you’re not pressing the pedal. However, when you do press the pedal, a push rod moves forward within the booster and into the master cylinder. The side of the diaphragm facing the cabin vents to atmospheric pressure, while vacuum is maintained on the other side.

This then equalizes with pressure on the other side of the diaphragm, providing the boost needed to make pressing your brake pedal easier. The hissing noise you hear when the brake pedal is depressed could be nothing more than ordinary operation, or it could be a sign of a deeper problem. There are a couple of different potential issues here, some more severe than others.

Common reasons for this to happen:

  • Leaking Vacuum Line: Your brake booster is supplied with vacuum from the engine via a vacuum hose. It’s usually located near the firewall. If this hose has a leak, it can be heard within the cabin.

  • Leaking Brake Booster Diaphragm: The diaphragm that’s responsible for maintaining pressure within the brake booster can fail, particularly if the master cylinder is leaking fluid into the booster. When this happens, you’ll hear a hissing sound when depressing the brake pedal, but the pedal itself will be much, much harder.

  • Damaged or Missing Foam Silence: Most cars equipped with brake boosters also have a foam silencer that’s designed to help prevent you from hearing that hissing sound. If the silencer has degraded or been damaged, you’ll hear the hissing sound.

  • Failing Master Cylinder: If you hear a hissing sound and suspect that the problem is the diaphragm in the booster, the actual cause is likely the master cylinder beginning to fail. Signs that the master cylinder is leaking into the brake booster include low fluid in the reservoir with no visible leaks.

What to expect:

A top-rated mobile mechanic will come to your home or office to inspect your brake system, including the brake pedal operation, the brake booster and listen to the hissing sound. The mechanic will then provide a detailed inspection report that includes the scope and cost of the necessary repairs.

How it's done:

The mechanic will need to crank the car in order to verify the hissing sound, and a test drive may be necessary to duplicate the complaint. Additionally, the mechanic will inspect the brake pedal operation, the condition of the brake booster, the master cylinder, the level of fluid in your system and more.

How important is this service?

Power brakes are wonderful things, making it far easier to work a brake pedal that would otherwise require significant force to activate. While the hissing sound may be a sign of nothing more dangerous than a failed piece of foam, it could be a symptom of something much more worrisome – a damaged brake booster and a failing master cylinder. You cannot afford to take chances with your brake system. One of our professional mechanics can inspect the entire system and determine if there’s cause for concern, and what needs to be done if there is a problem.

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Excellent Rating

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Rating Summary
395
17
2
0
9
395
17
2
0
9

Breck

20 years of experience
681 reviews
Breck
20 years of experience
Pontiac Grand Prix V6-3.8L - Car is not starting Inspection - Houston, Texas
Early, informative, hard working, and honest, great service!

Peter

43 years of experience
1321 reviews
Peter
43 years of experience
Pontiac Grand Prix V6-3.8L - Battery Cable Replacement (Positive, Negative) - Phoenix, Arizona
Peter is my hero. He showed up at 12:00 the appointment was not until 1:30 a whole hour and thirty minutes before he had to be here,,, Who does that now a days? He knocked on my door and when I opened the door he had the brightest friendliest smile that once again put me at ease and knew it would all be all right. Peter was flawless and so profesional I will always recommend his service. I could not be more happy today MY MECHANIC is a company that has my loyalty they took care of us as promised and are also trustworthy. I did nothing special but talk to their people and right away they kept to everything they told me they would do, if that was to give us a call back to let us know we were not forgotten. Thank you and I will be singing your praises. And Peter a Special Thank you for being yourself I know who to call from now on. You guys have made me feel not everyone is out there to rip you off and some company's and their employee's are worth an excellent review.

Damian

11 years of experience
430 reviews
Damian
11 years of experience
Pontiac Grand Prix V6-3.8L - Window is not going up or down - Kissimmee, Florida
Damian was great! He explained the problem and showed me. He also told me what was best to fix the problem as well. I will recommend your service to friends and family.

Jamahl

20 years of experience
830 reviews
Jamahl
20 years of experience
Pontiac Grand Prix V6-3.8L - Water Pump - Sanford, Florida
Did a great job.

Excellent Rating

(423)

Rating Summary
395
17
2
0
9
395
17
2
0
9
Number of Pontiac Grand Prix services completed
4653+
services done by our mechanics
TOTAL NUMBER OF EXPERT Pontiac MECHANICS
800+
experts on our platform

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