Toyota 4Runner 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

(1,128)

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

(1,128)

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 Toyota 4Runner 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
1991 Toyota 4RunnerV6-3.0LService typeHissing noise when brake pedal is depressed InspectionEstimate$114.99Shop/Dealer Price$124.99 - $132.49
2007 Toyota 4RunnerV8-4.7LService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$105.01 - $112.52
1984 Toyota 4RunnerL4-2.4LService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$105.01 - $112.52
1995 Toyota 4RunnerL4-2.4LService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$104.99 - $112.48
2016 Toyota 4RunnerV6-4.0LService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$105.02 - $112.55
1994 Toyota 4RunnerL4-2.4LService typeHissing noise when brake pedal is depressed InspectionEstimate$94.99Shop/Dealer Price$105.01 - $112.52
1986 Toyota 4RunnerL4-2.4L TurboService typeHissing noise when brake pedal is depressed InspectionEstimate$99.99Shop/Dealer Price$109.87 - $117.28
2003 Toyota 4RunnerV6-4.0LService typeHissing noise when brake pedal is depressed InspectionEstimate$99.99Shop/Dealer Price$110.24 - $117.94
Show example Toyota 4Runner 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 Toyota mechanics

Real customer reviews from Toyota owners like you.

Excellent Rating

(1,128)

Rating Summary
1,063
45
7
3
10
1,063
45
7
3
10

James

30 years of experience
873 reviews
James
30 years of experience
Toyota 4Runner V8-4.7L - Pre-purchase Car Inspection - Winter Park, Florida
Very professional. Called to discuss his report. Very pleased.

Jonathan

11 years of experience
40 reviews
Jonathan
11 years of experience
Toyota 4Runner V6-4.0L - Brake Pads Replacement (Front, Rear) - San Diego, California
Very nice guy and worked very hard and overall did a great job but fell short of completing the job due to not having the right equipment to complete the task.

Simon

27 years of experience
283 reviews
Simon
27 years of experience
Toyota 4Runner V6-4.0L - Brake Pads Replacement (Rear) - Silver Spring, Maryland
Simon is an outstanding mechanic. His skills are over the top[, especially his proficiency with details. As a DIY mechanic for 65 years, I was watching a pro as he worked my rear brakes THANKS Simon

Daniel

21 years of experience
346 reviews
Daniel
21 years of experience
Toyota 4Runner V6-4.0L - Battery Terminal Ends - League City, Texas
Very friendly and informative

Excellent Rating

(1,128)

Rating Summary
1,063
45
7
3
10
1,063
45
7
3
10
Number of Toyota 4Runner services completed
12408+
services done by our mechanics
TOTAL NUMBER OF EXPERT Toyota MECHANICS
1600+
experts on our platform

Recent articles & questions

Symptoms of a Bad or Failing Air Diverter Valve
If your car is running rougher than usual, gas mileage is suffering, or the Check Engine Light is on, you may need to replace the air diverter valve.
How Long Does a Fog Light Switch Last?
When When driving at nighttime, your vision isn't the greatest, never mind if you're dealing with snow, fog, or rain. With all of this going on, sometimes your headlights just don’t seem like enough. That’s exactly why fog lights exist...
How to Drive Your Manual Transmission Car With a Broken Clutch
If you drive a car with a manual transmission, there will likely come a point in time when the clutch wears out (https://www.yourmechanic.com/article/how-long-does-a-clutch-last)...

2006 GMC Envoy not going into gear

Most vehicles like yours will have a shift lock actuator which allows you to change gears when you press the brake pedal. Usually a slight click sound can be heard when the brake pedal is depressed to indicate that the...

Convertible Top Malfunction Light is on

Those two systems are unrelated. However, there is a possibility that a wire or fuse was bumped during the transmission replacement. A special scan tool can help determine the reason for the light. An inspection of your electrical components (https://www.yourmechanic.com/services/electrical-components-are-not-working-inspection)...

How many Camshaft position sensor are in a Saturn relay

There is two camshaft sensors on this engine mounted in the front of the engine inline with each camshaft.

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