Question about 1992 Ford Econoline

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Theres a noise inside the van that sounds like an air leak down by the brake pedal and it has something to do with the brake system

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Yes, the seal in the brake booster has gone bad, leaking vacuum, when it goes out the brake paddle will get very hard and hard to stop your van, the only fix is replacement of power brake booster, hope this was very helpful.

Posted on Aug 26, 2010

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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

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I replaced the front brake pads and added brake fluid, but the brakes are still soft to the point the pedal goes down the where they start a jerking and the brakes don't want to lock up and bearly want to...

You need to bleed the brakes. Starting at the furthest brake from the master cylinder bleed the brakes, ending at the brake closest to the master cylinder.

Nov 20, 2010 | 2000 Dodge Grand Caravan

1 Answer

Air leak sound from break pad ?

a brake pad is a small solid piece of steel with some brake material glued or riveted to it. i can't even think how a brake pad could make any noise. If you mean the brake pedal makes an air leak noise when you push it down, then i think you need a new vacuum booster.

Oct 25, 2010 | 2001 Mazda Tribute

1 Answer

Brake pedal is stiff and makes a noise like leaking air when pushed. What is the problem?

Without being there it sounds like your vacume booster seal is blown out. does the sound come out near the pedal inside the car? if so you will be replacing the booster.

Aug 29, 2010 | 1998 Dodge Caravan

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Brakes go all the way to the floor, the van set for 1.5 years, I changed the master cylinder but have not bleed the brakes yet. could it be something else?

Indicates air still in the system. I suggest that you start at the master cyl, remembering to keep it full during & after each attempt at bleeding the system and to only fill it by using a funnel & allowing the brake fluid run down the side to eliminate new air being put into the system.

Bleed the master cylinder first by loosening those brake lines while someone has pumped up the system & is holding the pedal to the floor. Make sure your assistant is not releasing the brake pedal before you are tightening the lines each time after bleediing the system, and that all brake pedal movement is done slowly, especially releasing the brake pedal. It causes fluid to rise into the air, bringing air back into the fluid.

Next, go to the farthest brake away from the master cylinder & bleed it, working yourself to the next farthest until you finish with the closest brake. This prevents air from switching lines on you during the process.

If there are no leaks & you have followed this method, there shouldn't be any air in the system & your brakes should be good.

Double check inside the truck to see if there is brake fluid coming from the new Master cylinder behind the brake pedal, that indicates the new seals didn't seat properly.

good luck

Feb 15, 2010 | 2000 Dodge Caravan

2 Answers

Air/Hissing Noise from Brake Pedal

air may have gotten into your brake lines. try bleeding your brakes. this will require two people

May 29, 2009 | 1995 GMC Suburban

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94 buick brakes

Sounds like a bad master cylinder. Possibly a bad power booster with the leak you are describing. Check for leaks in lines/hoses/wheel cylinders as well.

Mar 07, 2009 | 1994 Buick LeSabre

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2000 Jeep Grand Cherokee brakes make a hissing noise

has your brake pedal seem to be stiffer than usual? the sound you hear is from the brake booster if it has a leak it will cause a noise but you would have a stiffer pedal because the booster is loosing vacuum.

Feb 08, 2009 | 2000 Jeep Grand Cherokee

1 Answer

Brake problem in pedal

you did'nt say why you changed the rf brake hose, but i'm assuming it was leaking, check to make sure the new one is not leaking and there is no other leaks in the system, this includes the other 3 calipers and hoses, the rear hose in between the rear hard line on the frame to the rear hard line on the rear axle. if there is still air in the right side line then the left side would be doing all the work and may cause your abs to kick in on the left side if it is attempting to lock up. this may be the noises you are hearing. if you still have power brakes after you shut the engine off, (you should be able to pump the pedal 3 or 4 times with the engine off before the pedal becomes hard) then the booster is ok. if it has a swooshing sound inside the car, (hard to describe that sound on a keyboard), then you may have a leak in the seal on the brake pedal side of the booster. brake master cylinder sounds like it is bypassing. if it still goes to the floor after you rebleed then replace the master cylinder. if a brake pedal goes all the way to the floor, it is possible to ruin the cylinder and cause it to bypass, this is caused by rust or corrosion, the seals on the plunger are compromised letting brake fluid leak past. any other questions please let me know. thanks

Sep 17, 2008 | 2000 Chevrolet Blazer

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