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Air leak from brake pedal - Cars & Trucks

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 393 Answers

SOURCE: brake air leak noise

check under dash for a leaky vaccum switch. if booster was faulty brake pedal would be very hard to depress.

Posted on Dec 27, 2008

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co7196
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SOURCE: hard brake pedal hear air leaking when pedal pushed

When you press on the brake? Have your brake vacuum assist checked. It,s that bigspaceship looking thing between the brake master cylinder an firewall. good luck and be safe.

Posted on May 25, 2009

DOODYDOODYDO
  • 105 Answers

SOURCE: my power brakes failed and i can hear an air leak,

IF YOUR HEARING IT IN THE CAB YOU MAY HAVE A LEAK AT THE BOOSTER WHERE THE PEDAL ENTERS IT GET UNDER THE DASH AND PRESS THE PEDAL BY HAND AND SEE IF YOU CAN HEAR IT COMING FROM WHERE THE PEDAL ROD GOES INTO THE FIRE WALL

Posted on Dec 09, 2009

  • 1 Answer

SOURCE: VOLVO S80 2.5 D LEAKING

vovlo s80 2.9 1998 air leaking from servo from brake pedal really hard brakes. will this need servo replacing thanks

Posted on Jan 04, 2010

reisdos
  • 1297 Answers

SOURCE: sounds like air is leaking behind the brake pedal

fairly normal...some are louder than others
but if the brakes work you will be OK

the air escaping is what allows the booster to function because it needs atmospheric pressure to boost the pedal application

I've replaced many of these for a customer only to find the replacement makes a worse noise!

Posted on Apr 06, 2010

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2 Answers

I have a 96 geo prizm. I have replaced the front and back brakes. I have bled the brakes and the foot pedal is firm for about the first4 days. After the 4 days the brake pedal gets really soft and you...


It sounds like master cyl. is drawing in air causing prob. also another test would bee too bleed out and get pedal back, now step on pedal and hold firmly and see if pedal creeps near floor indicating innternal leaking in master cyl. also have some one pump bakes slowly aand look for air bubbles in brake res. after bleed out indicating master cyl. is drawing air upon release of pedal.

Jan 24, 2011 | 1996 Geo Prizm

1 Answer

I have a 1981 Corvette and my pedal has to be pumped to get a hard pedal.The Brake Master cyl. has been changed twice in 5 days the brake fluid level remains full.The brakes have been bled 5 times and on a...


First check each wheel brake cylinder for small leaks. If no leaks then the brakes have not been bled properly. Liquid will not compress like air, thus the reason pumping the pedal makes the brake pedal come up. If you had all of the air out of the lines then you pedal would not be soft. With your pedal going to the floor either there is air in the lines or fluid is slowly leaking.If it is a small leak on one of your wheel cylinders, it may be hard to detect without pulling the wheels off and looking. Small leaks on your wheel cylinders may never drip off of the car.

Dec 09, 2010 | 1981 Chevrolet Corvette

3 Answers

Why do i hear air when i press the brake pedal


well, you don't really hear air when you press the brake pedal. You might hear hydraulic fluid going through the valves in the master cylinder, that sounds like air flowing through a vent. But, I assure you, it is not air.

One can press and pump on the pedal when the car is off and hear the 'rush' of fluid which sounds kind of like air rushing out of an inner tube.

It's a common mistake to believe a rush of air is being heard when pushing on the brake pedal.

Aug 26, 2010 | Chevrolet S 10 Cars & Trucks

3 Answers

Brakes stay soft even though they have been bled and the brake booster replaced. It sounds like there is an air leak somewhere. I replaced the master cylinder as well then they were bled and still I have...


If there are no brake line/fitting leaks and no crimped or bent brake lines/hoses:
The key to my answer is the sound of air leaking...
Check the Brake Booster to the rear of the Master Cylinder.
1. Check the Vacuum Hose going to the Air Resonator with the one way check valve. Make sure the Vacuum Hose does not have cracks, holes, etc.; or does not collapse with the engine on. If there are any problems with the hose - replace the hose. With the engine on: remove the Hose for the Resonator and check for a vacuum. CAREFULLY: Remove the Resonator and reconnect it to the Vacuum Hose. Again check for the presence of a vacuum coming from the inside of the Resonator. If the Hose had a vacuum, but the Resonator does not = Replace the Resonator. If there is a Vacuum - Reconnect the Vacuum Hose and Resonator to the Brake Booster

2. Checking the Brake Booster Seals:
a. While the Engine is running: Push in the brake pedal. Stop the Engine while keeping the Brake Pedal pushed in.
(1) If there is a change = the Brake Pedal sinks to the floor: The Brake Booster has a Air Leak.
(2) If there is no change = GO TO TEST 2 (#3 below)

3. Turn the engine on and wait a couple of minutes and turn the engine off. Push in the Brake Pedal several times.
a. If the Pedal goes down farther the first time, but continues to rise = gets harder after the 2nd, 3rd time the Brake Booster is fine.
b. If the Pedal continue to go farther down on each push = the Brake Booster has a leak.

One seal in particular - located where the Brake Booster is attached to the Fire Wall - located behind the Brake Pedal Arm. Check the mounting bolts for tightness. With the engine on and a partner pushing on the Brake pedal: try to determine if that rear seal is where the air is leaking from.
Any Air Leak in the Brake Booster Main Seals = a new (remanufactured) Brake Booster must be purchased, as these are not repairable.

Let me know if this helped. or if you have additional information or questions. Feel Free to contact me at FixYa.com!

May 13, 2010 | 1998 Plymouth Breeze

1 Answer

Sounds like air is leaking behind the brake pedal


fairly normal...some are louder than others
but if the brakes work you will be OK

the air escaping is what allows the booster to function because it needs atmospheric pressure to boost the pedal application

I've replaced many of these for a customer only to find the replacement makes a worse noise!

Apr 06, 2010 | 1999 Jeep Grand Cherokee

2 Answers

I have a 1998 chevy s10 it has a good brake pedal with the engine off but with it running the pedal go'es to the floor and you can hear air at brake booster


Check for fluid leaks and your brakes. If you see no leaks and your brakes are in good shape replace the brake master cylinder and bleed the system. The air you hear is because the pedal went to the floor. If the booster goes bad the pedal will get so hard you can hardly push it at all. I think you will find if this happened suddenly either you have a major leak or the master cylinder went bad.

Sep 29, 2009 | 1998 Chevrolet S-10 Pickup

3 Answers

Hard brake pedal hear air leaking when pedal pushed


When you press on the brake? Have your brake vacuum assist checked. It,s that bigspaceship looking thing between the brake master cylinder an firewall. good luck and be safe.

May 25, 2009 | 1999 Chevrolet Tahoe

2 Answers

Air/Hissing Noise from Brake Pedal


this noise is caused by a defective power brake vacuum booster, (big round thing behind the master cylinder) the diaphragm is leaking vacuum.

May 06, 2009 | 1995 GMC Suburban

1 Answer

SPONGY BRAKE PEDAL


spongy brake pedal indicates air in the system... have the brakes inspected for leaks as it leaks when you apply the brakes and sucks in air when you release them.

Robert

Dec 17, 2008 | 2008 Toyota Camry

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