Question about Chevrolet C1500

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Brakes hissing when pedal applied - C1500 Chevrolet Cars & Trucks

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  • devvy2 May 07, 2009

    I have the same problem with my 2003 Tahoe and I'm trying to remove the booster, but I'm having trouble removing the power booster rod from the brake pedal. Anyone know how?



    Also is there a way to seal this leak without replacing the entire power booster?

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2 Answers

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Your power brake booster is leaking vacuum, you will in the end loose the power brakes, it is called the power booster, they are available from any good parts store, like NAPA, very pricey at dealer. Some units are available separately, others they want you to buy the booster and master cylinder as a unit. It takes a couple of hours to replace, and the brakes will have to be bleed if you end up replacing the master cylinder, 2 people make the job much easier.

Posted on Aug 04, 2008

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Good overview !, for my sister ! I would like to see a breakdown on How to R&R. The retaining clip has a dual purpose, it is also retaining a Plastic gizmo riding on top of the brake pedal plunger rod? We destroyed ours in the removal, I wanted to pull the coulmn, just to get at the the clip, any one out there with any expolded views, let me know.
God Bless & thanks,
goldslegerdad@yahoo.com

Posted on Oct 08, 2008

5 Suggested Answers

onyeredson
  • 404 Answers

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

  • 160 Answers

SOURCE: Air leak sound around the brake pedal.

sounds like a brake booster problem

Posted on Nov 11, 2008

yotaguy
  • 232 Answers

SOURCE: Air/Hissing Noise from Brake Pedal

Actually it sounds like the vacuum booster,which would explain the hissing noise.You easily check this,with the truck running depress the brake pedal and feel for air movement around the actuator rod that comes through the firewall and connects to the brake pedal.Fluid leaks either in the cab or around the master cylinder are generally the first sign that a master cylinder has gone bad.

Posted on May 06, 2009

  • 819 Answers

SOURCE: There is a hissing sound that is coming from the

your brake booster is leaking internally. this is a one piece, non serviceable component, and the entire assembly must be replaced. good luck!

Posted on Jul 07, 2010

Testimonial: "Thanks, I had a suspicion"

  • 326 Answers

SOURCE: My 2003 ford expedition just started a hissing

most likely have a bad diaphram in the brake booster that hisssing sound is vacuum leaking under hood there will be hose going to brake booster unhook hose and pinch off hose start car does hissing sound disappear if so bad booster

Posted on Sep 03, 2010

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1 Answer

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.

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Yoou most likely have a vacuum leak in the line from the booster to the intake. It could be a bad booster or check valve as well.
Thanks;
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RPM Northwest

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