Mercedes-Benz CL63 AMG Hissing noise when brake pedal is depressed Inspection at your home or office.

Our certified mobile mechanics come to you 7 days a week between 7 AM and 9 PM.

Estimate price near me

Service Location

Customer Ratings

(5,600)

How A Diagnostic Works

Instantly book a certified mobile mechanic to come to you

Mechanic diagnoses the problem and quotes necessary repairs

Your vehicle is ready to go

Fair, upfront & transparent pricing for all services

Our certified mobile mechanics can come to you now.

Customer Ratings

(5,600)

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 Mercedes-Benz CL63 AMG 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
2013 Mercedes-Benz CL63 AMGV8-5.5L TurboService typeHissing noise when brake pedal is depressed InspectionEstimate$114.99Shop/Dealer Price$139.99 - $158.75
2014 Mercedes-Benz CL63 AMGV8-5.5L TurboService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$120.04 - $138.82
2011 Mercedes-Benz CL63 AMGV8-5.5L TurboService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$120.03 - $138.82
2008 Mercedes-Benz CL63 AMGV8-6.3LService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$119.98 - $138.72
2009 Mercedes-Benz CL63 AMGV8-6.3LService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$120.07 - $138.89
2010 Mercedes-Benz CL63 AMGV8-6.3LService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$120.03 - $138.82
2012 Mercedes-Benz CL63 AMGV8-5.5L TurboService typeHissing noise when brake pedal is depressed InspectionEstimate$99.99Shop/Dealer Price$124.69 - $143.22
Show example Mercedes-Benz CL63 AMG 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.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert Mercedes-Benz mechanics

Real customer reviews from Mercedes-Benz owners like you.

Excellent Rating

(5,600)

Rating Summary
5,210
189
54
28
119
5,210
189
54
28
119

Jermaine

24 years of experience
250 reviews
Jermaine
24 years of experience
Mercedes-Benz CL63 AMG V8-5.5L Turbo - Oil Change - Greenbelt, Maryland
Good Job .

Dana

25 years of experience
13 reviews
Dana
25 years of experience
Mercedes-Benz CL63 AMG V8-5.5L Turbo - Oil Change - Fairfax, Virginia
Job well done .

David

13 years of experience
405 reviews
David
13 years of experience
Mercedes-Benz CL63 AMG V8-6.3L - Battery - Marietta, Georgia
Right on time. Great service.

Tien

23 years of experience
903 reviews
Tien
23 years of experience
Mercedes-Benz C55 AMG V8-5.5L - Serpentine/Drive Belt - Dublin, California
Top notch professional arrived early and finished sooner than I expected. You can’t ask for more when you book Mr.Tien.

Excellent Rating

(5,600)

Rating Summary
5,210
189
54
28
119
5,210
189
54
28
119
Number of Mercedes-Benz services completed
61600+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
1100+
experts on our platform

Recent articles & questions

Symptoms of a Bad or Failing Wiper Gearbox
Common signs include wiper blades moving erratically, only one wiper blade working, and the wipers not working when selected.
P0325 OBD-II Trouble Code: Knock Sensor Malfunction (Sensor 1, Bank 1)
P0325 code definition Knock Sensor Malfunction (Sensor 1, Bank 1) What the P0325 code means P0325 is a general ODB2 diagnostic trouble...
P2565 OBD-II Trouble Code: Turbocharger Boost Control Position Sensor Circuit High
P2565 P2565 code definition If you were to break down the meaning of each part of the P2565 OBD-II trouble code, it would yield something like “B” Rocker Arm Actuator Control Circuit Open Bank 1. For the average person, that...

Camshaft timer is off.

You will want to have the fault codes read out of the engine computer to see where the fault lies. P0011, P0016, and P0017 all have to do with the camshaft actuator. These faults are saying the camshaft position does...

Bank 1 and Bank 2 running lean

If lean faults occur after the manifold was removed and reinstalled, this indicates a vacuum leak (https://www.yourmechanic.com/article/is-it-safe-to-drive-with-a-vacuum-leak) which also means that unmetered air is coming into the intake. Either a vacuum line (https://www.yourmechanic.com/services/vacuum-hose-s-replacement) or induction pipe is loose, or the...

Driving down the road and my 95 Chevy silverado sputtered and died. Now it Won't start what could this be?

It is very possible that the fuel pump is going bad. Many times when the fuel pump fails this can cause the vehicle to die due to lack of fuel delivery to the engine. I would recommend having your fuel...

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 (844) 997-3624 · hi@yourmechanic.com