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Whistle in brake booster - Explorer Ford Cars & Trucks

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  • Anonymous Sep 08, 2008

    How do you get the booster off? The brake peddle rod keeps it from pulling out of the firewall. What should I take off to get thr equired Clearance

  • tomtinsley Sep 17, 2008

    My problem is whistling during the first 1/2 mile of driving-- after that the whistling stops!



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Makes a whistle but stops while braking

the whistle indicates a failing brake booster
when you apply the brakes , a valve is opened to allow air into one side of the diaphragm and assists you to push on the brakes
if a hole is developed in the diaphragm or the seal to the valve then it whistles or squeaks
get a proper diagnosis done at an accredited specialist brake shop and a quote for the repairs

Mar 11, 2016 | 2012 Kia Sportage LX AWD

2 Answers

How do you know that a brake booster is bad?

Booster problems are rare but they do go bad sometimes.
A bad booster generally causes the brake pedal to feel hard to push down, and a lot of pressure on the brake pedal is required to make the car stop.
Rarely, a vacuum brake booster will develop a vacuum leak, which can cause engine performance problems, hissing or whistling noise, as well as requiring increased pressure on the brake pedal to stop.

The first test:
With the vehicle parked, turned OFF, and the parking brake set, pump the brake pedal 5 to 6 times. If the pedal gets harder to push after several times, your booster is probably good.

The second test (To make sure):
After the test above, without making any changes, press and hold the brake pedal with light to moderate pressure.
Now with your foot still on the brake pedal, start the vehicle.
If the booster is good, you will feel the pedal go down when the engine starts.

Hope this helps!

Jun 21, 2014 | 1993 Cadillac DeVille

1 Answer

Soft whistle under hood

check for vacuum leak in hose to the brake booster or brake booster diaphragm.

Jan 04, 2014 | Honda Pilot Cars & Trucks

1 Answer

I have the (apparently) fairly common problem on my 2002 Tribute with the whistling sound under the brake pedal. Apparently the brake booster and gasket needs replacing with an updated item. Is this simple...

It sounds like you do have a bad brake booster. you can buy a rebuilt booster for about a hundred buck plus about a fifty dollar core charge. If you google mazda tribute brake booster repair you will find some good directions if you wish to DYI.

Jul 29, 2011 | 2002 Mazda Tribute

1 Answer

We find ourselves on the Alaskan Hwy, at Ft. Nelson. Yesterday we noticed a whistling noise coming from what appears to be brake compartment and when you apply the brake or turn the steering wheel, it...

A whislting noise would make me suspect a cracked or broken vaccuum line. Whistling as it sucks air into the system. I would check the biggest one first, on your brake booster. It is a large line coming from the engine to the brake booster assembly located behing the brake master cylinder. I would check all the lines with engine running, have a helper rev the engine slightly while you listen in the engine compartment to see if you can locate it. Also work the brakes simultaneously. Cold weather can make older lines crack which can cause a serious problem depending on which line cracks or breaks. Check all your air lines first and see if you find it in that system before assuming something more major. A crack in other engine system lines will usually produce a fluid leak of some type.....Good luck!..Mike

Jun 19, 2011 | Dodge Ram 3500 Cars & Trucks

1 Answer

When i applied my brakes, it whistles it's not my brake pads or shoes or springs.I brought it to dealer and they changed the springs,and it still whistles.1999 dodge caravan.

Try this disconnect the brake booster vacume line plug it and drive. BE CAREFUL YOU HAVE NO POWER AST BRAKES!!!!! If the whistle goes away then you need a brake booster

Sep 14, 2009 | 1999 Dodge Caravan

1 Answer

Brake pedal pressure "whistling" whether totally stopped or braki

There is a seal where the rod from the booster connects to the foot pedal that is probably leaking

Jul 26, 2009 | 1999 Chrysler Town & Country

2 Answers

There is a whistling sound underneath the brake pedal after I press the brake on my mazda 2005 tribute

The last poster is absolutely correct. The Brake Booster is leaking engine vaccuum into the vehicle through the firewall. This is a fairly common issue on older Tributes. There is an updated Brake Booster and Gasket available from Mazda. I do suggest replacing both the booster and gasket but just a gasket may do. Good luck.

May 22, 2009 | 2002 Mazda Tribute

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