Question about GMC Sierra 1500

1 Answer

Brakes problem I have a 1996 GMC Sierra 4X4. When I press the brake pedal, I hear a hissing noise. It happened just this morning when I was leaving for work. The brakes work, but are not as responsive as normal. Is it my master cyliner, or booster?

Posted by on

  • Richard Scordino May 11, 2010

    booster

  • CarySchroeder May 11, 2010

    I assume you can hear this hissing sound while parked in your garage? Pop the hood, and have someone press the brake pedal while you are under the hood listening. (Not sure of your expertise, make sure you don't have loose clothing, hair, etc. that could get caught in moving parts, stay away from the belts, fans, etc.) Where does the hissing sound come from? Also, if you continue to press on the brake pedal, does the noise continue, or does it go away? What if you press on the brake immediately after killing the engine? Several minutes after killing the engine?

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 701 Answers

Jcakey: My name is Roger and I will answer your question for you. From what you describe the problem sounds like a bad vacum brake booster. A simple way to check is to do the following. With the engine off. Press on the brake pedal 4 or 5 times. This will deplete all vacum in the booster. Next start the engine while holding your foot on the brake pedal. The pedal should drop a couple of inches. If the pedal does not drop. The problem is the brake booster. When the booster is bad you will hear a hissing sound inside of the truck when you apply the brakes..
If the master cylinder is faulty you will wave mushy brake to no brakes.Your ABS and brake failure lights will be on. Should you need further help please just ask. I will be glad to help you. Please rate this answer as this is how we know your answer was useful.Thank You for using Fix Ya. Roger

Posted on Sep 09, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My brake pedal will not budge, and a hissing noise present when running


The stop lights won't go out until the pedal is depressed, as there is a switch which is activated by the pedal.

A hard brake pedal is probably caused by a defective servo. The hissing noise is probably an air leak in the servo.

Switch the engine on, open the bonnet (the hood..) and see if you can locate the hissing - that'll probably be in the brake servo area.

If you don't know what a brake servo looks like here is a generic image:



26071617-5gult0ot5kkhyupfos0rfps2-1-0.jpeg

Jan 27, 2016 | 1989 GMC Sierra

1 Answer

Hissing brakes


IT is probably a vacuum leak in the brake booster. With the pedal going to the floor There is either no brake fluid or you will have to bleed the system. Replace the booster and bleed the brakes starting at the longest line first

Oct 08, 2013 | Dodge Neon Cars & Trucks

1 Answer

1996 Buick Park Avenue Ultra making a hissing noise when I press Brake Pedal. Have to Press super hard to stop or slow down.


Sounds like a possible air pocket in the braking system. Do you know how the bleed the brakes? They may need to be bled. Also, if you've added brake fluid recently, and didn't put the cap back on, it could create a suction. Another note is to check the cap to the brake fluid reservoir. It's rare, but, it could be bad.

Jul 10, 2013 | Cars & Trucks

1 Answer

1995 GMC sierra vacuum leak when brake pedal is pushed


you mean you hear it WHEN you push pedal ? power booster could be going bad ! check allvacuum lines, sound good ? any trouble with brakes ? hard pedal ? tighten throttlebody mounting bolts ! gaskets do go bad, they get hard, dryout, become brittle, vacuum leak !!! replace vacuum lines if cracked, dryed out, etc.,, you can use a 3 to 4'-0 pc. of hose to listen hissing sounds where vacuum occurs to locate the leak .

Mar 24, 2013 | GMC Sierra 1500 Cars & Trucks

1 Answer

When I step on the brakes I hear a hissing sound. The breaks ar mushy and the RPMs increase when I am in park and I step on the brakes.


That sounds like the power brake booster unit is faulty and it will require replacing the power brake booster unit to repair the vehicle. Also, check to see if there are any vacuum lines running to the brake switch(s) on the brake pedal lever that might have come loose or are damaged.

Aug 15, 2010 | 1997 GMC Sierra

1 Answer

Brakes no power assistance, the servo doesn't appear to work, but I can hear hissing when I press brake pedal. I have been told a new diaphram has been fitted.


if you hear hiss the diaphram is bad or was incorrectly installed. buy a coplete remanufactured unit they are tested before shipping to stores.

May 06, 2010 | 1996 Jeep Grand Cherokee

1 Answer

95 gmc sierra 4X4 brake pedal very hard to push. every time touch brake pedal rpms go up 500, and it hisses on the inside of the cab. any solutions?


I think I would be looking at the vacuum booster for the brakes having a leak. Block off the vacuum line and try the brakes again. Make sure you have lots of room to stop. If the booster is bad then the pedal will still be hard but the RPM's and hissing should go away. Hope this helps.

Oct 12, 2009 | GMC Sierra 1500 Cars & Trucks

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

2 Answers

Air/Hissing Noise from Brake Pedal


this noise is caused by a defective power brake vacuum booster, (big round thing behind the master cylinder) the diaphragm is leaking vacuum.

May 06, 2009 | 1995 GMC Suburban

2 Answers

2004 GMC sierra 1500 4x4 brakes


Have you checked the hardware on the disc brakes all the way around, as well as checking the rear pads? Wore out hardware could cause you to require more pressure to get the pads to move, as well as low brakes on the rear. Your braking system sends more pressure to the front of the vehicle because it requires more pressure up there. Less pressure on the rear can cause this to happen. I'm willing to bet the problem from the pedal is coming from the rear brakes somewhere and not the front. The last possibility that I can think if is a problem in the ABS solonoids, they might not be opening up all the way causing you to require more pressure.

Aug 07, 2008 | 2000 GMC Jimmy

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

703 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

77499 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...