Question about 1988 Ford Bronco II

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When applying pressure on the brake pedal, it sounds like its leaking air and very little brakes?

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Check to see if the brake master cylinder has gone out. Don't drive it until you get it fixed.

Posted on May 30, 2010

  • Fat Frank May 30, 2010

    My 87 B 2 was doing something like that. The vacuum check valve was bad,air would go in both directions when you blow on either conection. After check valve change tried foot on pedal when starting and got no drop on pedal effort and a hissing noise. Vacuum booster was bad also.Changed it out and back in business. Frank

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See the added comment to 240cpa post

Posted on May 31, 2010

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When I press the break and then release there is an air leak sound. What is the cause?


The brake servo or booster is divided into two chambers separated by a flexible diaphragm. Briefly there is vacuum on one side and pressing the brake pedal allows air to enter the other side and this is how the brake pedal effort is boosted.

The air enters via a filter through which the pushrod connected to the brake pedal passes. When the brake is applied the hiss of air entering the chamber will be audible; more on some models than others.
When the forces are balanced; when the brake is sufficiently applied no more air will be required and the hiss will cease. When the brakes are at rest; not applied there should be no hissing.

If there is it indicates a problem with the brake booster, perhaps dirt in the valve gear. Although repairs are possible they aren't very practical to carry out. A repair shop would probably charge more for fitting an overhaul kit than for replacing the unit.

May 11, 2016 | Cars & Trucks

1 Answer

My 2003 chevy trailblazer has expierenced a soft brake pedal for the past two years. The vehicle will brake when pedal is applied however when stopped you can push the pedal to the floor. I have replaced...


Sounds like you have air in one or more brake lines. All four brake lines needs to be bled to get all air no matter how little air is in them. Recommendations use two people to do this one in vehicle one at the wheel you are bleeding. Loosen bleeder,attach a rubber tube that fits tight around fitting, get a glass jar, (I use a baby food jar) put a little brake fluid in jar so the tube doesn't **** back in air, slowly apply brake and watch air bubbles in jar, do this until no more air bubbles come out. You must do this on all four wheels to be effective. If this doesn't work there is a leak somewhere. Lines, caliper, or wheel cylinder.
Happy Motoring!!!!!!

Mar 21, 2011 | Chevrolet TrailBlazer EXT Cars & Trucks

2 Answers

I have a 2001 ford taurus and every time i push the brake pedal my brakes dont brake right and sounds like air is leaking


Is the brake pedal getting harder to depress? Also have you had any work done on the vehicle immediately prior to this problem? If the pedal is getting harder to depress it could be a failing power brake booster if your car has one. Some ABS systems are different than others

Feb 17, 2011 | 2001 Ford Taurus

1 Answer

On my 2004 Jetta 1,8T the brakes are starting to get hard. Taking s little more pressure on the brake pedal to stop the car. What could be causing this??? Thanks


The most likely cause is loss of power assistance to the braking system which means you will need to apply increased brake pressure to compensate for the loss of assistance.

The problem will be with the brake servo assist. It is possible there is a leak in the brake servo assist system, which reduces the vacuum, so you are not getting sufficient mechanical assistance when applying the brakes.

It is unwise to be driving the car with this condition. If you lose all power assistance to the brakes, which could easily occur with this fault, the pedal will become very hard, you will need to apply very high pedal pressure and the vehicle will be very difficult to stop. You need to take the car to a VW dealer for service or to a competent brake specialist in your area to inspect the system and rectify the fault.

VW did a recall on some earlier year models for a leaking brake servo and I understand the problem was a faulty vacuum hose which would fail and leak. I am not aware of any recall for this item on later models like your 2004 vehicle.

All the best.

Dec 03, 2010 | 1997 Volkswagen Jetta

1 Answer

Replaced rear brake pads, now there is a hissing sound coming from brake pedal when i start it , come to complete stop and after i turn car off .what is the hissing or air pressure release sound coming...


There are 2 things that can use vacuum near the brake pedal. If you have cruise control, there is a safety switch on the pedal to shut off the curise when you apply the brake. This switch may be leaking.
The other part is the brake booster, which is actually in the engine compartment but bolts to the firewall, and your brake pedal mechanism pushes into the booster. You will need to get your head under the dash with the engine running and press on the pedal to locate the leak--on the switch or on the wall.

Sep 07, 2010 | 2004 Ford Expedition

1 Answer

Pressing on brakes feels like cushion going down


This could be loss of pressure in master cylinder due to rubber cup wear. Does pumping the brake pedal give you more pressure and higher pedal even if for a little while? Vacuum leak on power boost sometimes makes a gushing air sound and longer stopping distance.

Aug 12, 2010 | 1996 Oldsmobile Bravada

1 Answer

1998 Suburan brake pedal gushes air along the firewall.


you got it, the booster is leaking reducing the vacuum to the intake, replace it

Oct 26, 2009 | Chevrolet Suburban 1500 Cars & Trucks

1 Answer

Intermittently I need to press harder to get the brakes to work.


sounds like your master cylinder is beginning to internally bypass. By releasing and re-applying the pedal you are essentially "pumping" the pedal, to regain pressure. A quick check is to apply moderate pressure to the pedal and hold it. If the pedal begins to sink, replace the master.
Also check everything for small leaks that slowly bleed system of fluid and permit air to enter. (especially wheel cylinders and backside of master cyl.)

Jul 16, 2009 | 1997 Honda Civic

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