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Why a whistling sound heard when brake pedal is pressed

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Vacume leak in brake booster or hose.

Posted on Aug 12, 2017

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  • Cars & Trucks Master
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Whistling can be the brake pad wear onto the metal, could mean the pads have worn down uneven, or there is a problem with the disc or drum depending what is fitted. either way you need to have a look at the brakes to find the problem, can cause poor braking or no braking in the event you need to brake fast.

Posted on Aug 12, 2017

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Posted on Jan 02, 2017

onyeredson
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SOURCE: Hissing sound from brake pedal of Renault Scenic 2001

Hi,
From your description this appears to be a Brake servo issue.
The brakes are assisted by a vacuum created from the draw off the inlet manifold, it gives assistance too the brake pedal pressure by a large tank/cylinder mounted on the Bulkhead/firewall.
I feel that the sound you a hearing is air being draw into the Brake Servo from the foot pedal seal and the reason for fluctuation in the engine is the vacuum from the inlet manifold is being upset.
Attention I suspect should be addressed to the Brake servo/pedal seal or gaitor.
I hope this clarifies your thoughts?
Please remember to rate my effort.
Paul 'W'
Onyer~EDSon(:0) {#><U.K.

Posted on Jan 22, 2009

  • 306 Answers

SOURCE: Brake problem (squishy sound)

A sound like that that you can hear inside has to be the vacumn assist tank leaking air. Did you bleed the new master cyl ?

Posted on May 04, 2009

  • 2 Answers

SOURCE: 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.

Posted on Jun 30, 2009

Rayvin1943
  • 97 Answers

SOURCE: 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

Posted on Jul 26, 2009

teemossinmia
  • 265 Answers

SOURCE: 2001 Chrysler Concorde pressed the brake

That sound you hear is coming from the Vauum Brake Booster...Sooner or later the Brake Pedal will get hard, because the seal inside of the Brake Booster is leaking..And the only way to repair it, is , to replace the Brake Booster...But also check your Vacuum Hose that is instaaled on your Brake Booster..It goes from the Brake Booster, which is behind the Master Cylinder...From there to the Intake Manifold...Just make sure that there are no cracks in that hose, and make sure it is on all the way...because if the hose is bad, then thats all you will have to replace....Goodluck...

Posted on Dec 07, 2009

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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.

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Whistling sound while applying brakes.


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2001 Chrysler Concorde pressed the brake


That sound you hear is coming from the Vauum Brake Booster...Sooner or later the Brake Pedal will get hard, because the seal inside of the Brake Booster is leaking..And the only way to repair it, is , to replace the Brake Booster...But also check your Vacuum Hose that is instaaled on your Brake Booster..It goes from the Brake Booster, which is behind the Master Cylinder...From there to the Intake Manifold...Just make sure that there are no cracks in that hose, and make sure it is on all the way...because if the hose is bad, then thats all you will have to replace....Goodluck...

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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

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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.

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2000 Isuzu trooper whistle sound


most likely the intake manifold gasket. My 99's went out at 58k. common for the model.

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Hissing sound from brake pedal of Renault Scenic 2001


Hi,
From your description this appears to be a Brake servo issue.
The brakes are assisted by a vacuum created from the draw off the inlet manifold, it gives assistance too the brake pedal pressure by a large tank/cylinder mounted on the Bulkhead/firewall.
I feel that the sound you a hearing is air being draw into the Brake Servo from the foot pedal seal and the reason for fluctuation in the engine is the vacuum from the inlet manifold is being upset.
Attention I suspect should be addressed to the Brake servo/pedal seal or gaitor.
I hope this clarifies your thoughts?
Please remember to rate my effort.
Paul 'W'
Onyer~EDSon(:0) {#><U.K.

Jan 22, 2009 | 2000 Renault 181

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