Question about 2005 Hyundai Santa Fe

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Check valve We have been trying to get a brake booster check valve from the dealership for a week now. They keep telling us they are on back order and can't give us a clue when they will be in Do you have any ideas where we can get this for our 2005 Santa Fe Hyundai? Our car is doing the same thing as the other posts. The booster has been replaced but it feels like the brakes are locking up, the car doesn't want to go, the pedal is to hard to push, etc. Thanks

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  • 96 Answers it is a 1 way valve for the booster vacuumn

Posted on Nov 07, 2008

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I replaced the master cylinder and brake pads and my brakes still dont work on my 1998 chrysler sebring

Have you tested your brake booster and your calipers?Your brake booster doesn't make any noise, and it doesn't use any electricity or gasoline, but it ensures that you can stop your car with only a light touch of the brake pedal. Things weren't always like that: before the invention of the vacuum brake booster, cars still stopped. It's just that you had to really stomp on the brake pedal. The modern brake booster is an ingenious device that operates using something that your engine generates whenever it's running: vacuum. The brake booster takes engine vacuum via a rubber hose that runs from the intake manifold, and the brake booster uses that vacuum to amplify the pressure you put on the pedal. A light application of the brakes is translated by the brake booster into significantly more pressure on the brake master cylinder, ensuring that your car stops quickly. So what happens to the brake booster if your car stalls, resulting in a loss of engine vacuum? Early designers realized that gas engines were hardly foolproof, so they designed a little check valve into the brake booster circuit. The brake booster stores enough vacuum to provide full boost for two or three pedal applications even after the engine dies. The check valve on the brake booster is what keeps that vacuum from leaking out. And speaking of leaks, that's the reason most brake booster units have to be replaced. As your brake booster ages, the rubber seals and diaphragms that hold the vacuum tend to wear out and crack. If the brake booster can't hold vacuum (despite the check valve's best efforts), its time is up and you'll need a new or remanufactured new brake booster.

Jun 14, 2011 | 1999 Chrysler Sebring

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Stalls when pressing brake peddel

check for a faulty booster check valve. it is on vacuum hose to booster. you should only be able to blow on only one side, if you can blow through both sides then it is bad. the check valve holds the vacuum in booster. if bad you will lose vacuum. The check valve keeps the vacuum in the booster from leaking back into the intake when engine vacuum drops because of high loads or when the engine dies.
The symptoms would be no power boost when you turn the engine off or when the engine dies. Step on the brake with the engine running and note pedal position. Turn off engine and step again and the position should be the same. If the pedal is hard and higher then the check valve or booster is bad. have a good day!!

Nov 10, 2010 | 2003 GMC Yukon

1 Answer

How do I remove the brake power booster from a '97 Thunderbird? I'm getting a hissing sound and can feel air under the dash when I press on the brake pedal. All of the bolts, clips, master cylinder, etc...

Remove the rod going to the brake pedal,then remove the master cylinder,you may can unbolt the master,from the booster,and move it out of the way without removing the brake lines,they will give quit a bit.Now go back inside and remove the four nuts on the studs holding the brake booster in,they may be a little hard to reach,and of course remove the check valve with the hose on it,going to the booster under the hood,If this was at all helpful,please rate,thank you.

Jul 12, 2010 | Ford Thunderbird Cars & Trucks

2 Answers

Car stalls when brakes applied firmly

Check for Vacum leaks from the master cylinder lines.

Oct 23, 2009 | 2000 Mitsubishi Galant

4 Answers

This is hard as it is my daughters suv far away and she is being told the brake system has a leak in the power booster bladder.A fix of 450.00 that she does not have. I seem to recall a check valve problem...

The check valve is the plastic connector that the vacuum line connects to the brake vacuum booster with. An alternative is to get a used booster from a salvage yard, it would be about 1/3 the price of a repair of the leaking one.


Aug 24, 2009 | 2001 Ford Escape

2 Answers


sense its a deisel i would go with the vacume pump, diesels don't put out any or very little vacume, if you don't have vacume than booster won't work hense hard peddel. when you say you let up on peddel and hit it again you got better break tells me it is not getting enought vacume to booster. i would go for the vacume pump.

Feb 02, 2009 | 1993 Ford F250

2 Answers

Hydro boost


Appreciate the "Ask Me" and my compliments, scary driving one of those in our roads.

Might you have to check the Brake Booster. Normally, there would be a vacuum line to the booster from the intake manifold. Common design calls for a PCV type valve at the entrance to the booster. Pls check this. It also operates on the same principle and therefore checks the same, you can blow one way but not the other; would have a sliding ball inside that acts as the valve. In some instances, it could be the diaphragm inside that might have a tear.

Of course, the Proportioning valve system must likewise be checked. I have heard a lot of brake problems with K2500 especially the rear drum.

Incidentally, there was a recall order of some sort. TSB 99-05-24-001A SEP 99 which addressed brake pull/wear, the recall involved replacing the proportioning valve.
  • The Technical Service Bulletin referenced previously discusses the issue surrounding the proportioning valve. Also, there's a corrosion issue which has resulted in the recall of the trucks in certain states.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Aug 10, 2008 | 1999 Chevrolet C/K 2500

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