BMW Z3 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 BMW Z3 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
2000 BMW Z3L6-2.8LService typeHissing noise when brake pedal is depressed InspectionEstimate$114.99Shop/Dealer Price$132.49 - $145.62
1997 BMW Z3L4-1.9LService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$112.52 - $125.67
1998 BMW Z3L6-2.8LService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$112.52 - $125.67
2002 BMW Z3L6-2.5LService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$112.48 - $125.60
2001 BMW Z3L6-2.5LService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$112.55 - $125.72
2001 BMW Z3L6-3.2LService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$112.52 - $125.67
1997 BMW Z3L6-2.8LService typeHissing noise when brake pedal is depressed InspectionEstimate$99.99Shop/Dealer Price$117.28 - $130.25
1998 BMW Z3L6-3.2LService typeHissing noise when brake pedal is depressed InspectionEstimate$99.99Shop/Dealer Price$117.94 - $131.39
Show example BMW Z3 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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(64)

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Emmette

36 years of experience
282 reviews
Emmette
36 years of experience
BMW Z3 L6-2.5L - Spark Plugs - Arlington, Virginia
Emmette was fantastic! He arrived early. He changed my one of my ignition coils and all spark plugs. When doing so, he showed me an oil leak seeping into the plugs which he explained caused the short. A different repair shop I went to two days prior advised e to change all coils and plugs at a price of $1,100, They never once noticed the leaking oil under the failed coil (and all others). When my car sputtered a bit on initial start up, Emmette insisted I take it for a ride while he waited for my return. He did so to ensure that the repair worked and I was satisfied. Emmette also inspected my entire car on his own accord. He sprayed a squeaky door, adjusted my tire pressure which was excessive (55 lbs of pressure instead of 32 in all 4 tires. This excess was done by a dedicated "tire" shop when they put my new tires on...What the heck!). He also fixed a bent gas cap (which is likely the cause of 2 EVAP leak codes). He did so at no charge, whereas the other shops wanted to replace major EVAP parts at yet another $1, 500. So far, no EVAP code has returned. I was a bit apprehensive having an unkown mechanic outside of a physical shop do the work on my BMW Z3. However after my exceptional experience with Emmette, I'm going to hire him to replace an expansion hose and to further diagnose and fix the oil leak he found.

Adam

29 years of experience
95 reviews
Adam
29 years of experience
BMW Z3 L6-2.5L - Serpentine/Drive Belt - San Antonio, Texas
Adam arrived ahead of schedule and completed the work promptly. He also took the time to talk to me, show me what was wrong and how he fixed it, as well as explain all of the functionality to me.

Nezar

26 years of experience
67 reviews
Nezar
26 years of experience
BMW Z3 L6-3.2L - Battery is dead - Fort Lauderdale, Florida
Great knowledge and support as well as very nice person

Grzegorz

41 years of experience
473 reviews
Grzegorz
41 years of experience
BMW Z3 L6-2.5L - Oil Change - Pacifica, California
Grzegorz is a Master Mechanic for European cars and has tuned up my BMW Z3 in the past. I was very happy to have found him and appreciate the work, service, and recommendations when it comes to the upkeep and maintenance of my car. Thanks again for the excellent service!

Excellent Rating

(64)

Rating Summary
63
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63
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Number of BMW Z3 services completed
704+
services done by our mechanics
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1100+
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